Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 81. (Budapest 1989)

Papp, L.: A review of the Afrotropical species of Poecilosomella Duda (Diptera, Sphaeroceridae)

AFROTROPICAL SPECIES OF POECILOSOMELLA 137 probably all tropical Africa. Most of the specimens collected by my colleague DR. ANDRÁS DEMETER in Nigeria, were caught on baboon droppings. On the other hand, it seems not so abundant on dung of large ungulates. Consequently, it is possible that it was transported to South America (and later towards North America) by commerce, i.e. by slave-trader ships some hundreds of years ago. Poecilosomella arnaudl sp. n. (Figs 2-5) Measurements in mm: body length 2.45 (holotype), 1.90-2.71 ( d d paratypes), 2.08-2.92 (99 paratypes) wing length 2.52 (holotype), 2.00-2.71 (d d paratypes), 2.17-3.00 (9 9 paratypes), wing width 1.15,0.86-1.21 and 0.90-1.24, respectivery. Description - Thorax and abdomen dark brown, mesonotum with silvery spots in sagittal line, in the dc lines, behind humeral callus and around base of characteristic bristles. Ocellar bristles moderately long, occï rather long, vie, vti strong, 2 exclinate ors (posterior pair slightly reclinate), 3 (rarely 4) pairs of ifr. Antennae reddish yellow, 1st flagellomere with diffuse dark spots on both sides. Frons light reddish brown or reddish yellow, orbital plates, ocellar triangle together with vertex dark. Facial plate and genae reddish yellow, former shining. Vibrissae strong, peristomals comparatively short and thin, several short proclinate genal bristles. Thoracic chaetotaxy as in related species; ca. 4 slightly proclinate katepisternal bristles. Femora dark brown, ochreous apicalry, basic colour of tibiae yellow to reddish yellow with wide dark brown rings both in the proximal and distal third (proximal rings more or less fainted on fore tibia). Tarsi yellow, 5th tarsomeres dark brown, 1st, 2nd and 4th tarsomeres of hind tarsi dark dorsalfy (at least partly so). Armature of male middle tibia: no ventral bristles, va rather long but comparatively thin and parallel with 1st tarsomere, ad-s: one very long at proximal 2/5 and at distal 5/6, a more anteral very strong bristle at distal 2/3; pds: one moderately long at distal 4/5,2-3 short and thin bristles in middle third, some short and thin ads in proximal third. Wings unicolourous, light brownish, a dark spot each on apex of R2+3 and on costal vein just distalfy to apex of RI, base of R4+5 and R2+3 (Rs) dark, other veins ochreous. Ratio of second and third costal sections: 0.615 mm vs. 0.846 mm, 0.718 mm vs. 0.885 mm, i.e. 0.73-0.81. Ratio of intracrossvein section of M to hind crossvein: 1.07-1.16. Haltères light yellow. Periandrium with a pair of long bristles and several shorter bristles, subanal plate sagittally with a long sclerotized process (two processes merged) and with some long bristles (Fig. 2). Distiphallus with a long central filament (Fig. 3), phallophore ventrally with dense long hairs. Postgonite angulatefy curved (Fig. 4), less wide than that of capensis. Gonostylus (Fig. 5) with a wide anterior lobe and with a ventromedial digitate lobe, latter bears a short thick tooth apicalry. Holotype male: B CONGO [Zaire]: Thysville, VII-31-1957 - E. S. Ross & R. E. LEECH collectors (CASTypeNo.l6041).-Paratypes:54 d,169 (37d,ll 9 CAS, 17 d,5 9 HNHM): same data as for the holotype. P. arnaudi sp. n. is related to P. capensis sp. n. and P. longecostata (DUDA). The differences in body features are given in the key, but there are distinct differences also in the subanal plate, gonostylusf, postgonite and distiphallus. I dedicate this new species to DR. PAUL H. ARNAUD, JR., whom I am grateful to for repeated shipments of invaluable material from his institution. Poecilosomella capensis sp. n. (Figs 6-13) Measurements in mm: body length 2.55 (holotype), 2.46-2.92 ( d d paratypes), 2.29-2.96 (99 paratypes), wing length 2.72 (holotype), 2.46-2.92 (dd paratypes), 2.38-2.95 (9 9 paratypes), wing width 1.18,0.98-1.22, 0.98-1.24. Description - Body and legs as those ofarnaudi sp. n. but dark alar spots bigger, frons darker (reddish brown), antennae reddish brown or light brown. Five pairs or short but distinct ifr. Head chaetotaxy similar to that of arnaudi but bristles thicker, usually 1 very strong upcurving genal bristle present.