34 U.S. NATIONAL MUSEUM BULLETIN 2 83 



Wing with only 1 seta on radius, at base; scutellum with 4 large bristles; 

 spermathecae and male genitalia not as above 14 



14. Tarsomere III of fore leg with 1 stout ventral spine; abdominal tergum I 



with 7 hairs in each lateral cluster; male genitalia with stout basistyle 

 expanded mesad into a strong mediangular process; aedeagal sclerites 

 bisinuate, slender, oriented nearly transversely, forming extremely low 

 arch, with outer margin at midlength having a sclerotized point marking 

 lateral attachment of caudal accessory lobes; parameres each with main 



body bifid apically macclurei, new species 



Tarsomere III of fore leg with 2 stout ventral spines; abdominal tergum I 

 with 11-12 hairs in each lateral cluster; male genitalia with basistyle 

 markedly truncated basomesad with weak mediangular process; dististyle 

 straight to blunt tip; aedeagal sclerites with prominent caudal accessory 

 lobes, their arch quite high; parameres each with main body sickle shaped. 



subalba, new species 



15. Palpal segment I with a hair 16 



Palpal segment I without a hair 18 



16. Abdominal tergum I with only 4 central setae; caudal terga each with char- 



acteristic setation — sparsely set weak setae, shortest at middle, more or 

 less in a subcaudal row; wing with distal sector of vein Ri short and almost 

 in a line with r-m, IRC small; vein R4+5 with conspicuous distal swelling; 



more than 1 seta on radial vein xanthogaster, new species 



Abdominal tergum I with 5 or more central setae; caudal terga each with the 

 usual subcaudal row of larger setae; wing with distal sector of vein Ri and 

 r-m not in a line; IRC quite spacious, and vein R4+5 not swollen distad; 

 just 1 seta on radial vein, close to base 17 



17. Abdominal tergum I with 8-9 hairs in each lateral cluster and 8 hairs in 



center; setae on caudal terga not quite in a row; hind tibial comb of 6 

 spines; male genitalia with basistyle elongated; mediangular processes 

 prominent, pointed, with membranous bridge between; aedeagal sclerites 

 slender without any caudomesal expansion, their arch quite high; each 

 paramere with strikingly elbowed basal lobe, its free end directed caudad, 

 main body stout at base, gradually tapering distad into a filiform process 

 with a short, hyaline process at base .... fasciscutata, new species 

 Abdominal tergum I with 7 hairs in each lateral cluster and 5 hairs in center; 

 setae on caudal terga in straight posterior row; hind tibial comb of 8 spines; 

 male genitalia with elongate basistyle; mediangular processes short with- 

 out any bridge between; aedeagal sclerites bisinuate, slender at both ends 

 with prominent caudomesal swelling; parameres each with slender arcuate 

 basal lobe, main body stout and nearly straight in middle, bifid distally 

 with short lateral subapical point and a long slender, caudally directed 

 mesal branch obesa, new species 



18. Smaller species; eyes widely separated; wing with IRC very small, almost a 



nodule; female with larger tars 1 claw on all legs well developed; sperm- 

 atheca 1, intensely sclerotized with numerous hyaline perforations, peculiar- 

 ly retort-shaped to U-shaped with a slender, long neck. 



insolita, new species 



Larger species; eyes narrowly separated; wing with IRC spacious; female 



with larger tarsal claw well developed only on fore leg, quite small on 



other legs; 2 functional spermathecae, weakly sclerotized without hyaline 



perforations, third rudimentary spermatheca present. 



miripes, new species 



