353 



low, first segment black, tip brown ; length 3.75 mm 



5. pacJiymera. 



— Scutellum unicolorous brownish yellow; abdomen brown, paler on 



dorsum ; length 2.5 mm 6. ohscura. 



7. Fifth joint of hind tarsus spinose ventrally 8 



— Fifth joint of hind tarsus unspined 10 



8. Knob of halteres black, stem yellow; abdomen white; legs black, 



bases of tarsi white 7. alhiventris. 



— Knob of halteres yellow or white 9 



9. Thorax glossy black; abdomen white; legs whitish yellow, apical 



half of all femora, apices of hind tibia, and last tarsal joint of all 

 legs black ; wings whitish, veins colorless 8. elegans, 9 . 



— Thorax glossy black; abdomen greenish white, the dorsum black- 



ened except base ; legs black, yellow on apices of coxse, trochanters, 

 and bases of femora, basal four tarsal joints whitish; wings 

 slightly infuscated on anterior half from before cross vein almost 

 to apex, the veins on that portion, including anterior branch of 

 media, dark brown 9. smitlii. 



10. Mesonotum opaque pale fuscous ; slightly gray pruinose. 10. opaca. 



— Mesonotum glossy black or distinctly shining, .with pruinescence 



obscuring the disc in part 11 



11. Mesonotum with 2 whitish pruinose vittje; legs black, bases of tar- 



sal joints yellowish 11. hivittafa. 



— Mesonotum without whitish vittse ; legs with more than bases of tar- 



sal joints yellow 12 



12. Abdomen wholly black 13 



— Abdomen pale at base 14 



13. Legs black, a yellow band before apices of fore femora, another one 



near apices of fore and mid tibiae, and the tarsi yellow ; body high- 

 ly polished 12. gibber. 



— Legs yellow; coxae, apices of hind femora, hind tibia except bases, 



and whole of hind tarsi dark brown ; body only slightly shining ; 

 mesonotum distinctly pruinose 13. incerta. 



14. Legs yellow, apical half of all femora, extreme bases of all tibia, 



apices of hind tibia (rather broadly) and those of fore and mid 

 pairs (narrowly), and last tarsal joint, blackened. . 8. elegans, $ . 



— Legs yellow, knees, apices of tibia, and whole of last tarsal joint of 



all legs blackened 14. flavonigra. 



I. Probezzia termixalis Coquillett 



Ceratopogon terminalis Coquillett, Proc. Ent. Soc. Wash., 1904, p. 90. 

 Prohessia terminalis (Coquillett) Malloeh, Proc. Biol. See. Wash., Vol. 27, 1914, 

 p. 137. 



I have not seen this species. It was described from a female taken 

 in Nicaraugua. It is highly improbable that it occurs in Illinois. 



