137 



Genus CHZETOG^DIA Br. and Berg. 



Clwtofjd'flia Braiier and Hergenstainui, Zweif. Kais. Mas. Wieu, V, p. 336; 1891. 



Our species have four postsutural and four steruopleural macro- 

 cliietie; palpi yellow: 



1. Femora black, apical cell open 2. 



Femora and tibiae yellow, apical cell short petiolate, hind tibia' out- 



waidly ciliate, sides of front densely yellowish gray pollinose, 

 sides of face each bearing a row of macrochietiu and with a row 

 of bristly hairs between it and the eye; length, 8 mm. Santa 

 Fe, N. Mex. (Biol. Cent.-Amer., Diptera, Vol. II, p. 121; May, 

 ISOO : Vyosplierysa.) rnfifrons v. d. W. 



2. Sides of front opaque, covered with a grayish pollen 3. 



Sides of front shining, destitute of i)ollen, sides of face bearing two 



or more irregular rows of bristly hairs between each eye and the 

 row of macrochjTjta?, abdomen black, the fourth segment yellow; 

 length, 10 to 12 mm. District of Columbia, and Mescalero, N. 

 Mex. (Tijdschr. voor Ent., Vol. II, p. 148; 18G7: Baumhau- 

 eria. Frontina acrofjlossoides Townsend, Trans. Amer. Ent. Soc, 

 Vol. XVIII, p. 367; December, 1891.) analis v. d. W. 



3. MacrocluptiB on sides of face much nearer to the eyes than to the 



facial ridges and appearing like a continuation of the frontal 

 bristles, only a few bristly hairs between them and the eyes; 

 abdomen wholly black; length, 10 to 12 mm. Las Cruces, K. 

 Mex., and California. (Biol. Cent.-Amer,, Dij)tera, vol. II, p. 



120; May, 1800: Frofijyhcrijsa.) crehra v. d. W. 



Macrochictic on sides of face nearer to the facial ridges than to the 

 eyes and widely removed from the lowest frontal bristles, numer- 

 ous bristly hairs between them and the eyes, sides of abdomen 

 and the fourth segment largely or wholly yellowish; length, 10 

 to 12 mm. California, and Kailua, Hawaii. (Ann. Soc. Ent. 

 France, p. 01 ; 1888 : Blepharipeza.) monUcola Bigot. 



Genus DICHOCERA Will. 

 Dichocera Willistou, Entomological News, Vol. VI, p. 31; January, 1895. 



Our two species are black, the palpi, apex of scutellum and of the 

 abdomen, and in one species also the antennie, yellow; two steruopleu- 

 ral macrochfetae: 



Third antennal joint yellow, three postsutural macroch^etiB, a mar- 

 ginal i)air on the second abdominal segment and a discal pair 

 on the third; length, 10 mm. Eastern Washingto)i. (Entomo- 

 logical Kews, Vol. VI, p. 32; January, 1805.) lyrata Will. 



Third antennal joint largely black, four postsutural macrochietne, 

 second abdominal segment destitute of a nuirginal pair, the third 

 destitute of a discal pair; black, the first two joints of antenme 



