Exoprosopa atrinasis Speiser, 1910

Greathead, D. J., 2001, A study of the Exoprosopa busiris (Jaennicke) group of Bezzi (1924) in tropical Africa (Diptera: Bombyliidae), Journal of Natural History 35 (1), pp. 127-147 : 135-136

Exoprosopa atrinasis Speiser

(Figures 3, 11)

Exoprosopa atrinasis Speiser, 1910: 80 , Tanzania [examined]

The description is insu ciently detailed to distinguish E. atrinasis from other similar species found in the area near the type locality at the foot of Mount Kilimanjaro. The unique female type has been examined and is redescribed below. It is in poor condition with all the legs, except the femur and tibia of the middle right leg missing and the body badly rubbed. However, the wing pattern and colour of the remaining scaling and other vestiture correspond with specimens from Ethiopia in the Natural History Museum identi®ed by Bezzi (1924) as E. atrinasis . The diOEerences from E. luteicosta are slight but are consistent in the specimens examined. Consequently both are recognized as distinct species. Of the two E. luteicosta is the most widespread and frequently encountered in collections.

Diagnosis

As E. luteicosta but: all veins bordered brown, spots darker. Some brown scales on femora near bases. No, or few, black macrochetae on coxae. Traces of a white band on t5. Length of body, 15±16 mm; of wing, 16±17 mm.

Description

HOLOTYPE m. Head. Black, grey tomentose, except buccal rim pale ochreous. Compound eyes separated by three times width of ocellar triangle. Ocellar triangle two times its length forward from vertex. Hair on frons and apex of facial cone black, shining yellow on genae. Sparse gold scales on anterior half of frons and genae. Occiput with adpressed silver scale-like hair behind compound eyes, short yellowish hair at margin of central excavation. Proboscis dark brown, labella projecting beyond face. Palpi dark brown with blackish hair. Antenna dark blackish brown. Antennal ratio 2.5:1:5. First ¯agellomere elongate conical, second equal in length to pedicel, paler brown. Thorax. Black with postalar calli, scutellum (except its base) and margins of pleural sutures dark red±brown. Long hair at fore margin, sides of mesonotum and pleura pale ochreous yellow, short hair on middle of mesonotum black. Macrochetae strong, black. Katepisternum with a small patch of yellow scales. Legs. Coxae black with stiOE ochreous hairs and a few black ones intermixed. Femur and tibia dark brown with black macrochetae and scales. Wing (®gure 3). Membrane grey, wrinkled. extreme base, costal cell, cells r to fork of 1

R, basal ö of r, and margins of other veins infuscated brown, also infuscation 2+3 5

of cross-veins darker blackish brown. Cross-vein r±m just before middle of discal cell, m±m twice length of r±m oblique to wing margin. Discal cell broad before apex, bulging into r. Squama brown with a brown fringe. Haltere brown. Costal 5

hook and comb black. Abdomen. Black. Traces of ochreous hair on tergum 1, hair at sides and on hind margins of 2±7 black and traces of bands of ochreous scales at fore margin of 2 and hind margins of 3±7. Sterna with yellow hair and scales, also black hairs at hind margin of 7. Length, of body 14 mm; of wing, 16 mm.

Male genitalia (®gure 11) similar to E. luteicosta but apex of epiphallus emarginate at sides.

Material examined

Ethiopia: Laga Hardin , 1, l 3.ix.1908, R. E. Drake-Brockman ( BMNH) ; Arussi Country, Gambogi , 1m, 14.x.1908, R. E Drake-Brockman ( BMNH) ;` Central Abyssinia’, Maraco , 1, l 7.v.1915, O. Kovacs ( BMNH) . Kenya: 2mm, R. J. Stordy ( BMNH) ; Simba , 3350 ft, 1 1 l m, 8± 9.iv.1911, S. A. Neave ( BMNH) ; coast W of Tiwi , 1m, 13.v.1963, (D. J. Greathead ( DJG) ; Lunga Lunga , 1m, 26.v.1981, W. R. Ingram ( DJG) ; Diani , 2 1 l m, xii.1945, van Someren ( BMNH) ; Lukenia , 1m, iv.1935, van Someren ( BMNH) ; Mackinnon Road , 1 1 l m, 30.ix.1981, R. H. Markham ( DJG) . Tanzania: Morogoro, 1, l 17.iii.1917, A. Loveridge ( BMNH) ; same, 1 1 l m, 17.iii.1917, BMNH; NE of Lokissale , 4850 ft, 1m, 23.v.1918, W. A. Lambourn ( BMNH) . Uganda: Karamoja, Kapoth , 1, l 15.iv.1969, D. J. Greathead ( DJG) .

Zambia: Broken Hill , 1m, 13.ii.1912, F. V. Bruce Miller ( BMNH) .

Distribution Ethiopia, Kenya, Tanzania, Uganda, Zambia (®gure 19).