u6 NORTH AMERICAN DIPTERA. 



SUBGKNKRA OF CKRATOPOGO.N. 



a. Win^s bare Atrichopogon Kieffer. 



Wings hairy. b. 



1). Hind metatarsus longer than the following joint, sometimes in 

 the male only equal. .... Ceratopogon. 



c. Hind metatarsus shorter than the following joint, sometimes 

 equal in the female. . . Forcipomyia Megerle. 



Empodium not so distinct, less than half as long as the claws, tin- 

 latter with setae at base; hind metatarsus always longer than 

 the following joint. {Oecacta is probably a synonym) (4). 



Culicoides Latreille. 



28. A cross-vein between the first and third veins. ... 29 

 No cross-vein between the first and the third veins. Bezzia Kieffer. 



SUBGKNKRA OF BRZZIA. 



a. Femora without prominent spines on the underside. 



Probezzia Kieffer. 



b. Some or all femora with spines. .... Bezzia. 



29. Femora unarmed, that is without stout black spines on the under 



side [Ceratoloph us Kieffer. ) (5) Johannseniella Williston. 

 Some or all the femora spinose beneath. .... 30 



30. Either fore or hind femora much thickened. ... 31 

 Femora not noticeably thickened (10). Palpomyia Megerle. 



SUBGENERA OF PALPOMYIA. 



a. Antennae of lx>th sexes verticillate with short hairs. 



Alasion Rondani. 

 Antennae of the male plumose b. 



b. Last tarsal joint with two rows of coarse spines below. 



Sphseromyas Stephens. 

 Last tarsal joint hairy below. . . Palpomyia Megerle. 



31. Pore femora thickened. . . . , . Heteromyia. 

 Hind femora thickened. .... Serromyia Megerle. 



ADDITIONAL GENERIC REFERENCES FOR THE CHIRONOMIDiE. 



Johannsen. Bui. 86. N. V. State Museum 1905. (Ablabesmyia, Ana- 

 topynia) . 



Kieffer. Hid. Soc. Entotn. France. 1899. 

 Ann. Soc. Sc. Unix. XXX. 1906. 

 " Genera Insectorum. Chironomidae. 190(1. 



Latrielle. den. Crust, et Ins. IV. 1809. (Culicoides.) 



Megerle. In Meigen's System. Heschr. Kur. Zweifl. I. 1818. (For- 

 cipomyia, Serromyia, Palpomyia). 



Rondani. Prodromus. II. 1857. (Alasion). 



Skuse. Proc. Linn. Soc. N. S. Wales. IV. 1889. (Procladius, Iso- 

 plastus) . 



Stephens. Catalogue Krit. Ins. II. 1829. (Sphserotnyas.) 



Williston. Journal N. V. Knt. Soc. XV. March, 1907. 



