74 R. W. CROSSKEY 



The female differs from typical species of Pomeroyellum by the bright golden scaling 

 on the thorax and most of the abdomen, and by lacking the usual sub-basal dark 

 band on the tibiae. 



The male hypopygium, especially shape of the ventral plate, closely resembles that 

 of the cervicornutum-group and of S.(P.) mcmahoni de Meillon in the schoutedeni- 

 group, but the vestiture of the larval abdomen in the form of compound deeply 

 multifid setae with the branches further bifurcated (see figure 8E in Garms & Post, 

 1967) is closely akin to that of the alcocki-group. 



S.(P.) kenyae is a swift -water species occurring in rocky turbulent habitats to 

 which the immature stages show clear adaptation in the necked cocoon (not found 

 in other species of Pomeroyellum) and by the greater number of hooks in the posterior 

 circlet of the larva (about 85 rows of 13-16 hooks instead of about 60-70 rows of 

 8-14 hooks as is usual in other species of the subgenus). 



The pupal gill with its eight filaments branching in four regular pairs from very 

 short common stems lying in the same plane (Text-fig. 184) is unique among 

 Ethiopian Simuliidae, although this is a very common form of gill among the 

 Palaearctic species of Simulium. In other Ethiopian species with eight filaments 

 there is a different branching arrangement ; they arise from a common stem, or if 

 in pairs {S.(P.) rodhaini Fain) one pair is in a different plane from the others. 



Included taxon. Simulium {Pomeroyellum) kenyae de Meillon. 



Subgenus MEILLONIELLUM Rubzov 



Meilloniellum Rubzov, 1962 : 1496. Type-species : Simulium hirsutum Pomeroy, 1922, by 

 original designation. 



Diagnosis, o"? : Basal section of radius haired. Pleural membrane bare or haired. Kat- 

 episternum bare. Fore tarsus slender, fore basitarsus about 5 -5-7 times as long as its greatest 

 breadth. $ : cibarium unarmed. Tarsal claws with large basal tooth. Scutum without 

 pattern. Abdomen thickly and evenly covered with pale scales. Seventh sternite developed. 

 Gonapophyses simple bluntly rounded lobes. Paraprocts normal. Spermatheca without sur- 

 face pattern or internal hairs. $ : scutum without pattern, with thick pale scales marginally. 

 Genitalia with small styles much shorter than coxites, style abruptly contracted subapically and 

 with attenuate tip, one apical spinule ; coxite not produced beyond base of style ; ventral plate 

 not toothed, with very small subparallel basal arms, subrectangular with deep median apical 

 emargination, broad in profile (Text-fig. 126) ; median sclerite strap-like ; parameres long and 

 narrow, with one long strong parameral hook. Pupa : Gill filamentous, 6, 8 or 11 filaments ; 

 gill a little shorter than pupal body. Abdominal onchotaxy normal, pair of small hooks vent- 

 rally on segment 4 in addition ; segments 6 or 7-9 dorsally with spine-combs. Cocoon simple, 

 without neck or median projection. Larva : Head and cephalic fans normal. Hypostomium 

 with usual nine apical teeth, these sharp and median and corner teeth prominent ; hypostomial 

 setae 3-5 in each row, rows lying parallel to lateral margin of hypostomium. Head-spots 

 negative, on cephalic apotome surrounded by dark pigmentation forming H-shaped mark. Post- 

 genal cleft much longer than postgenal bridge, large and subcircular. Mandible normal, second 

 comb-tooth smaller than first and subequal to third ; two mandibular serrations without super- 

 numeraries. Antenna long and slender, with four segments. Thoracic cuticle bare. Abdom- 

 inal cuticle posterodorsally with minute simple spinous hairs. Abdominal shape normal, 

 broadest in profile at sixth or seventh segment. Ventral papillae present but usually small, 



