REVISION OF SPECIES OF STILOBEZZIA KIEFFER 31 



Subgenus Neostilobezzia Goetghebuer 



Stilobezzia subg. Neostilobezzia Goetghebuer, 1934, in Linder, Die Fliegen der 

 Palaearktischen Region, Lief. 78, p. 53.— Wirth, 1953, Proc. U.S. Nat. 

 Mus., vol. 103, p. 63. [Type-species, Ceralopogon ochraceus Winnertz, desig. 

 Wirth, 1953, p. 63.] 



Diagnostic characters (figs. 24-34, 47). — Usually moderate size 

 to large species with yellowish or brownish color, unmarked wings 

 (except in Speculae Group), and legs often with well-developed 

 bristles. The species of the North and South Temperate Zones are 

 usually larger and more bristly. Eyes usually narrowly separated ; 

 female antenna usually with III-X cylindrical, XV with or without 

 apical seta; segment III of palpus usually with a subapical sensory 

 pit, I sometimes without a seta. Thorax bluntly rounded on anterior 

 margin of scutum, with or without dorsomedian tubercle or projection. 

 Halter often pale. Wing bearing at least a few macrotrichia on its 

 surface, in some species only a few distally in cell R 5 , often copiously 

 on distal portion of wing as far as vein Cui, usually fewer macrotrichia 

 in males; anal lobe seldom obtuse and alula seldom lacking fringe; 

 microtrichia strong, adding to the wing shading; costal margin with 

 fringe setae dense and not strictly in a row. Wing venation usually 

 strong anteriorly; IRC spacious, usually subquadrangular, 2RC 

 widely open; costa usually extending to more than two-thirds of 

 wing length; stem M usually subequal to r-m length. Legs without 

 stout spines on trochanters or femora, though frequently the bristles 

 are quite numerous and strong, especially on tibiae; tarsomere IV 

 cordate, its length simulating the length of III; V without ventral 

 batonnets; female claws unequal, the longer one well curved, slender, 

 and usually relatively long; male claws equal and bifid at tips, some- 

 times imperfectly. Abdomen without prominent color pattern on 

 terga, with weak to moderately strong hairs on terga. Spermathecae 

 1 or 2 functional, a rudimentary third not always present; the func- 

 tional spermathecae sometimes with hyaline perforations. Male 

 genitalia with narrow sternum IX, the caudomedian excavation 

 broad and shallow, and ventral membrane feebly to strongly spiculate ; 

 tergum IX usually rather elongate, caudal margin often with median 

 indentation, pubescent membranous submedian lobes small to large; 

 basistyle usually with only mediangular process present, basidorsal 

 process rare and transverse sclerotized bridge often absent; dististyle 

 usually not strongly bent or curved; basal apodemes of parameres 

 always prominent, the main body variously modified; aedeagal 

 sclerites usually bisinuate, with outer expansion at midlength, rarely 

 with submedian caudal membranous accessory lobes present. 



Distribution. — In the appendix, we have assigned 102 species to 

 this subgenus, with additional species provisionally referred here. 



