Igor Ya. GRICHANOV

Grichanov, I.Ya. Olegonegrobovia (Diptera: Dolichopodidae),

new genus from Uganda

Olegonegrobovia, new genus of dolichopodid subfamily

Campsicneminae with O. zlobini and O. barkalovi spp.n. from

mountain area of Uganda are described.

I.Ya. Grichanov, All-Russian Institute of Plant Protection,

Podbelskogo 3, St.Petersburg-Pushkin, 189620, Russia.

Key words: Diptera, Dolichopodidae, Olegonegrobovia gen.n.,

Africa, Uganda.

Olegonegrobovia gen.n.

Type-species: Olegonegrobovia zlobini sp.n.

Description (male). Occiput concave, frons not concave. One pair of

well developed ocellar and external vertical bristles. Postocular

bristles in one row. Eyes with short white hairs, joined in the

middle of face. Face extremely narrow; Epistome as a small triangle

under antennae and narrow strip in lower part; clypeus half as wide

as epistome. Face does not come down eyes. Cheeks undeveloped. Palpi

and proboscis short. Antennae black, with short articles, inserted in

the upper third of head; scape bare, pedicel with short setae,

transverse-oval, without appendices. First flagellomere as long as

high, bud-shaped, with rounded apex, densely haired. Arista dorsal,

basal article long, with short setulae, apical article densely

pubescent, with increasing length of hairs towards apex.

Mesonotum metallic green, pleura dark-green or brown; 1 h, 1 ph, 2

ntpl, 1 ia, 1 sa, 1 pa. Six pairs of strong dorsocentral bristles

with a few hairs in front of them; a few sparse uniserial

acrostichals. Mesonotum flattened near scutellum. Scutellum with two

strong bristles and one or two pairs of marginal hairs. Postnotum

high and well developed.

Wings oblong-oval, slightly darkened, with strong costal bristle

near base. Veins simple. Costa reaches m1+2 near wing apex; r4+5 and

m1+2 almost parallel in apical half. Posterior transversal vein

approximately perpendicular to m1+2 and m3+4, as long as apical part

of m3+4, placed in the middle of wing. m1+2 unbranched; cu1+a

reduced. Anal lobe small, but clearly developed, with sclerotized

distal edge, bearing a comb of long black compact bristles.

Fore and middle coxae with hairs, hind coxae with strong bristle.

Fore legs without strong bristles or spines; 2nd-4th articles of fore

tarsi shortened. Middle femora and tibiae slightly thickened, curved

and pressed, with a few long unusual ventral setae. Middle and hind

femora with preapical bristles. Hind tibiae with developed bristles.

Abdomen dark, short, laterally compressed; unmodified segments

together slightly longer than mesonotum. 1st-5th abdominal tergits

well developed, 2nd-5th sternits shortened. Hypopygium with short

hairs, big, sessile, attached to the tip of abdomen, concealed in

basal part, expanded down under the abdomen. Appendices short,

strongly sclerotized.

Diagnosis. Some features of new genus look like ones of Campsicnemus

Walker (legs and wings), Telmaturgus Mik (arista), Campsicnemoides

Curran (face), Anomalopyga Oldenberg (abdomen and hypopigium), Sympyc-

nus Loew (6 pairs of dorsocentrals and shape of first flagellomere)

and others, but it is clearly distinguished from any genus of Campsic-

neminae and related subfamilies by the complex of characters. Further-

more Olegonegrobovia has such unique for the family attribute (may be

male secondary sex character) as sclerotized wing anal lobe with a

comb of long bristles.

Etymology. The genus named after the Russian dipterologist Prof

Oleg Negrobov.

Holotypes and paratypes are conserved in the Natural History Museum

(London).

Olegonegrobovia zlobini sp.n. (Fig. 1, 2)

Holotype. Male, Uganda: Ruwenzori Range, XII.1934-I.1935,

B.M.E.Afr.Exp. B.M. 1935-203 / Kilembe, 4500 ft (F.W. Edwards).

Description. Frons metallic green, with violet reflection. Eyes

joined in middle fifth of face. Face bronze-black, grey pollinose,

very narrow, 4 times as high as wide under antennae. Epistome as a

small triangle with height/base ratioÿ1 ÿ07:4, and narrow strip lower,

twice as wide as clypeus. Palpi and proboscis very short, black,

covered with small hairs. Antennae black, slightly longer than height

of head. First flagellomere as long as heigh at base, with rounded

apex, densely pubescent. Arista dorsal, thrice as long as articles of

antenna together. Basal article of arista with short setulae, apical

article of arista 2.5 times as long as basal part, very densely

pubescent, with increasing length of hairs towards apex of arista,

which seems thickened therefore.

Mesonotum metallic dark-green, with blue reflection, pleura and

scutellum bronze-green, grey pollinose. Scutellum with two strong

bristles and two hairs from the outside.

Legs dirty-yellow, coxae and apical segments of tarsi brown, femora

mostly brownish. Fore and middle coxae with yellow-brown hairs in

apical half, hind coxae with one black strong external bristle. Fore

femora with a dark fine posterior preapical bristle. Fore tibiae with

small pale apicoventral scale of fine hairs. Fore basitarsi slightly

pressed in apical third. Second to fourth articles of fore tarsi

shortened. Length ratio of fore coxa to femora to tibia to tarsus

(segments from first to fifth) - 2.1 : 3.4 : 2.6 : 1.5 : 0.15 : 0.15

: 0.15 : 0.4. Middle femora slightly curved, pressed, and strongly

thickened on ventral surface in basal half; one of the ventral

tubercules bears a few black short hairs and a bundle of dirty-yellow

hairs stuck together, nearly as long as diameter of femora; one

strong preapical bristle. Middle tibiae slightly curved and pressed,

with one contraction in the middle and other in the middle of apical

half of tibia. One strong anterior, one fine ventral bristles in

basal half, one curved ventral and one dorsal apical bristles; dirty-

yellow ventral seta, as long as middle basitarsus, and irregular row

of short strong, partly hooked, strong bristles in apical third.

Second segment of middle tarsi slightly squeezed and enlarged. Length

ratio of middle coxa to femora to tibia to tarsus (segments from

first to fifth), 1.7 : 4.3 : 3.4 : 1.7 : 0.7 : 0.5 : 0.5 : 0.5. Hind

femora with one fine basal anteroventral and a few fine preapical

bristles. Hind tibiae with a row of three or four dorsal bristles in

apical third. Length ratio of hind coxa to femora to tibia to tarsus

(segments from first to fifth), 1.4 : 5.2 : 5.4 : 1.3 : 1.6 : 1.0 :

0.7 : 0.6.

Wings slightly darkened, veins brown. Ratio of parts of costa

between r2+3 and r4+5 to those between r4+5 and m1+2, 1.9 : 0.9.

Ratio of apical to basal part of m1 +2, 6.5 : 4.5. Anal lobe small

and short, but clearly developed, almost triangle, with sclerotized

distal edge, bearing a black compact comb of 10 long strong wavy

bristles and one shortened separate bristle. This comb three or four

times as long as its width, twice as long as posterior transversal

vein and nearly as long as apical part of m3+4. Anal angle obtuse.

Squamae dark-yellow, with brown edging and black bristles. Halteres

brown.

Abdomen bronze-green-black, with dark hairs, pressed from lateral

sides, twice as long as high. Hypopygium bronze-black, big, massive,

twice as long as high and nearly as long as abdomen; basal third

concealed. Appendices short, black, with dark and light hairs.

Female. Unknown.

Length: body 1.3 mm, wing 1.8 mm.

Distribution: Mountain area of Uganda (Ruwenzori Range).

Etymology. The species named after the Russian dipterologist Dr

Vladimir Zlobin.

Olegonegrobovia barkalovi sp.n. (Fig. 3)

Holotype. Male, Uganda: Badongo Forest, 7.II.1935 (F.W. Edwards)/

B.M.E.Afr.Exp. B.M. 1935-203.

Description. Frons bronze-green. Eyes joined in middle third of

face. Face very narrow, 6 times as high as wide under antennae.

Epistome as a small bronze-green equilateral triangle under antennae,

and densely pollinose narrow strip in lower part. Clypeus metallic

black, square, nearly half as wide as epistome. Palpi and proboscis

short, black, covered with dark hairs. Antennae black, slightly

longer than height of head. First flagellomere as long as heigh at

base, with rounded apex, densely pubescent. Arista dorsal, 3.5 times

as long as articles of antenna together. Basal article of arista with

short setulae, apical article of arista nearly four times as long as

basal part, densely pubescent, with increasing length of hairs

towards apex of arista.

Mesonotum metallic blue-green, slightly pollinose, pleura dark

bronze-brown, grey pollinose. Scutellum metallic green from above and

dark yellow-brown from below, posterior edge with two strong

bristles, two hairs inside and two hairs from the outside.

Legs and coxae yellow, middle coxae, hind femora from above and

last joints of tarsi slightly darkened. Fore and middle coxae with

brown hairs in apical half, hind coxae with one brown strong external

bristle. Fore legs without bristles. Fore tibiae with small yellow

apicoventral scale of fine hairs. Second to fourth articles of four

tarsi slightly shortened. Length ratio of fore coxa to femora to

tibia to tarsus (segments from first to fifth) - 2.0 : 3.2 : 2.7 :

1.6 : 0.3 : 0.2 : 0.2 : 0.4. Middle femora slightly curved and

thickened on ventral surface in basal half; one of the two ventral

tubercules bears a long dark bristle and a complex yellow horn of

stuck hairs, twice as long as diameter of femora; one anterior

preapical bristle. Middle tibiae with a contraction in the middle and

slightly thickened apicad. Three anterodorsal and one posterodorsal

bristles in middle third, three or four short strong black anterior

bristles and one yellow ventral seta, as long as middle basitarsus,

in apical third, two or three apical bristles. Length ratio of middle

coxa to femora to tibia to tarsus (segments from first to fifth), 1.8

: 4.0 : 3.5 : 1.9 : 0.9 : 0.7 : 0.6 : 0.6. Hind femora with one

strong anteroventral preapical bristle and a few posterior preapical

hairs. Hind tibiae with two or three dorsal bristles in apical third,

with two or three apical bristles, and with a row of posteroventral

hairs, as long as diameter of tibia. Length ratio of hind coxa to

femora to tibia to basitarsus, 1.3 : 4.9 : 5.2 : 1.3.

Wings slightly darkened, veins brown. Ratio of parts of costa

between r2+3 and r4+5 to those between r4+5 and m1+2, 2.5 : 1.1.

Ratio of apical to basal part of m1 +2, 6.7 : 4.5. Ratio of posterior

transversal vein to apical part of m3+4, 0.9 : 2.1. Anal lobe long

and narrow, but clearly developed, slightly longer than apical part

of m3+4, with fairly sclerotized distal edge, bearing a bundle of 5

long and 3 short strong black bristles. This bundle nearly as long as

posterior transversal vein. Anal angle obtuse. Squamae dirty-yellow,

with brown edging and black bristles. Halteres yellow.

Abdomen metallic dark bronze-brown, with dark hairs, pressed from

lateral sides, twice as long as high. Hypopygium brown, big, massive,

twice as long as high and nearly as long as abdomen, with dark and

pale hairs. Appendices short, brown, with pale hairs. Visible part of

hypandrium and aedeagus brown.

Female. Unknown.

Length: body 1.3 mm, wing 1.8 mm.

Distribution: Mountain area of Uganda.

Etymology. The species named after the Russian dipterologist Dr

Anatoly Barkalov.

Diagnosis. Males of the new species can be separated by many

attributes, the main of which are following:

- coxae brown, scutellum completely bronze-green, second article of

middle tarsi enlarged ...............................O. zlobini sp.n.

- coxae yellow, scutellum yellow-brown from below, middle tarsi

simple ............................................O. barkalovi sp.n.

Acknowledgements

I am sincerely grateful to Dr Brian Pitkin for his kindness in gi-

ving me the opportunity to study the collection of the Natural History

Museum (London). I appreciate the help I have received from Mrs Galina

Grichanova in doing the illustrations.
 
 

Remark under figures

Fig. 1. Olegonegrobovia zlobini sp.n., habitus.

Fig. 2. Olegonegrobovia zlobini sp.n., hypopygium.

Fig. 3. Olegonegrobovia barkalovi sp.n., hypopygium.