Igor Ya. GRICHANOV

Grichanov, I.Ya. Olegonegrobovia pappi sp.n. from Tanzania

(Diptera: Dolichopodidae)

Olegonegrobovia pappi sp.n. from East Tanzania is described.

A key to known species of Olegonegrobovia is given.

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

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

Key words: Diptera, Dolichopodidae, Olegonegrobovia pappi

sp.n., Africa, Tanzania.

Olegonegrobovia pappi sp.n. (Fig. 1)

Holotype. Male, Tanzania: Kwamsambia, Tanga region / 1-18.II.1987

(leg. Mahunka, Zicsi). Paratypes. Male & female, the same labels.

Holotype and paratype (female) are conserved in the Hungarian Natural

History Museum (Budapest). Male paratype - in the Natural History

Museum (London).

Description. Frons metallic bronze green. Eyes joined in middle

fifth of face. Face bronze-black, grey pollinose, very narrow, 3 times

as high as wide under antennae. Epistome as a small triangle with

height/base ratioÿ1 ÿ010:6, twice as wide as clypeus, and narrow strip

lower. Palpi and proboscis very short, brown, with a small bristle and

hairs. Antenna black; first flagellomere slightly longer than its

height at base, with acute apex, densely pubescent. Arista dorsal,

thrice as long as articles of antenna together, pubescent, with

increasing length of hairs towards apex of arista.

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

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

bristles and two microscopic hairs from the outside.

Legs including coxae yellow, apical half of middle and hind

femora and apical segments of tarsi darkened. Fore and middle coxae

with a few yellow-brown hairs, hind coxa with one black external

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

Fore tibia with small apicoventral scale of fine hairs. Second to

fourth articles of fore tarsi shortened. Length ratio of fore coxa to

femora to tibia to tarsus (segments from first to fifth) - 2.0 : 3.3 :

2.5 : 1.5 : 0.3 : 0.2 : 0.2 : 0.4. Middle femora slightly curved,

pressed, and thickened on ventral surface, bearing here a few black

short hairs and a bundle of brown hairs stuck together, nearly as long

as diameter of femora; one strong preapical bristle. Middle tibia

curved and pressed, subdivided into 3 sub-equal parts by two ventral

contractions. One curved anterior in middle third, one long apical

anterior and two short dorsal bristles; brown ventral seta in the

middle, as long as middle basitarsus. Middle tarsi simple. Length

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

to fifth) - 1.5 : 3.9 : 3.6 : 1.6 : 0.7 : 0.7 : 0.7 : 0.6. Hind femora

with a row of antero-dorsal seta in basal half, and with several ante-

ro-ventral setae in apical half. Hind tibia 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 : 5.0 :

4.8 : 1.3 : 1.7 : 1.2 : 0.9 : 0.7.

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

between R2+3 and R4+5 to those between R4+5 and M1+2 - 1.8 : 1.0.

Ratio of apical to basal part of M1+2 - 5.9 : 5.2. Ratio of m-cu to

apical part of CuA - 0.9 : 1.5. Anal lobe long and narrow, but clearly

developed, twice as long as apical part of CuA, with fairly

sclerotized distal edge, bearing a bundle of 3 or 4 black bristles,

nearly as long as m-cu. Anal angle obtuse. Squamae dark-yellow, with

black bristles. Halteres yellow-brown.

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

sides. Hypopygium dark-brown, big, massive, twice as long as abdomen,

expanded backward; basal fifth concealed. Cercus short,

yellowish-brown, densely haired. Surstylus long, dark-yellow, with a

row of strong ventral bristles.

Female. Similar to male except lacking male secondary sexual

characters. Legs and wings simple. First flagellomere somewhat

shorter, clypeus slightly wider than in male. Last hemitergit with

four short black acanthophorites.

Length: body 1.4 - 1.8 mm, body with antenna 1.8 - 2.3 mm;

wing-length 1.9 - 2.0 mm; wing-width 0.6 mm.

Distribution: East Tanzania.

Etymology. The species named after the Hungarian dipterologist Dr.

Laszlo Papp.

Diagnosis. O. pappi is generally related to O. zlobini and O.

barkalovi (Grichanov, 1995), except hypopygium expanded backwards.

Males of each species have their own kind of curvation, thickening and

setation on middle legs and can be also separated by many other subtle

attributes.

Key to known species of Olegonegrobovia Grichanov

1. Coxae brown, comb of bristles on wing anal lobe twice as long as

m-cu, second article of middle tarsi enlarged....O. zlobini Grichanov

- Coxae yellow, comb of bristles on wing anal lobe nearly as long as

m-cu, middle tarsi simple...........................................2

2. Scutellum yellow-brown from below, hypopygium as long as abdomen,

expanded down under abdomen....................O. barkalovi Grichanov

- Scutellum completely bronze-green, hypopygium twice as long as

abdomen, expanded backwards............................O. pappi sp.n.

Acknowledgements

I am sincerely grateful to Dr. Laszlo Papp for his kindness in

giving me the opportunity to study the collection of the Hungarian

Natural History Museum (Budapest). I appreciate the help I have

received from Mrs Galina Grichanova in doing the illustrations.

Reference

Grichanov, I.Ya. 1995. Olegonegrobovia (Diptera: Dolichopodidae),

new genus from Uganda. - Int.J.Dipt.Res. (in press).

Remark under figure

Fig. 1. Olegonegrobovia pappi sp.n., hypopygium.