March, 191 1.] FeLT : GENERIC SYNOPSIS OF IxONID^. 45 



Genus DIARTHRONOMYIA Felt 1908, type D. artemisics Felt. 

 Antennal segments i8, the flagellate ones stemmed in both sexes; 

 palpi biarticulate ; claws minutely unidentate. Separated from the 

 preceding genera by the greatly reduced palpi and from the follow- 

 ing genus by the more ninnerous antennal segments. North America. 



Genus COCCIDOMYIA, new genus, type C. pcnnsylvanica, new species.* 



Male. — Length, 1.25 mm. Antenns with 12 segments, the third and fourth 

 fused, the fifth with a stem three fourths the length of the subcylindric basal 

 •enlargement. Palpi : first segment short, stout, the second a little longer, nar- 

 rowly oval. Mesonotum dark brown. Scutellum and post-scutellum fuscous 

 yellowish. Abdomen dark brown, rather thickly setose. Genitalia fuscous yel- 

 lowish. Wings : subcosta uniting with costa at the basal third, the third vein 

 just before the apex ; the fifth indistinct distally, forks near its apex and joins 

 the posterior margin just beyond the basal half, its branch near the basal third. 

 Halteres and legs probably fuscous yellowish ; claws unidentate. 



Female. — Length, 1.5 mm. Antennal segments 12, the fifth with a stem 

 one third the length of the subcylindric basal enlargement. Palpi biarticulate. 

 Mesonotum dark brown. Scutellum and post-scutellum fuscous yellowish. Abdo- 

 men reddish brown, sparsely setose ; ovipositor short. 



Reared from young Lecaniuni scales. 



Type Cecid 938, N. Y. State Museum. 



Antennal segments 12, the flagellate ones in both sexes stemmed; 

 palpal segments biarticulate, the third vein uniting with costa at or 

 very near the apex. North America. 



Genus GUAREPHILA Tav. 1909, type G. albida Tav. 

 Allied to Diarthronomyia Felt, froiu which it is separated by the 

 uniarticulate palps and the trifid claws. Antennal segments 17 or 

 18, the flagellate ones subsessile. Africa. 



Tribe OLIGOTROPHIARIM. 

 The third vein in this tribe is well separated from the anterior 

 margin, the antennal segments are short, cylindric, usually stemmed 

 in the male and the claws are simple, this latter serving to differen- 

 tiate the species from the preceding tribe. 



Genus PHYTOPHAGA Rond. 1840, type Cccidomyia destructor Say. 



Antennal segments 12 to over 20, the flagellate ones stemmed in 

 the male, usually sessile in the female ; palpi quadriarticulate. Distin- 

 guished from the following by the third vein uniting with costa at 

 the apex of the wing. Synonyms: Mayetia Kieff. 1896, Mayctiola 

 Kieff. 1896, Poomyia Riibs. 1910. Europe, North America. 



* Coccidomyia pennsylvanica, new species. 



