204 NEW YORK STATE MUSEUM 



truncate; terminal clasp segment stout; dorsal plate short, broad, 

 deeply incised; ventral plate deeply and triangularly emarginate. 

 Type Cecid. 98. 



Phytophaga socialis Felt 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 369 (Mayetiola) 



This bright reddish species was taken on early meadow rue- 

 Thalictrum dioicum, at Albany, N. Y., June i, 1906. 



Female. Length i mm. Antennae shorter than the body, sparsely 

 haired, dark brown, yellowish basally; 14 segments, the fifth with 

 a stem one-third the length of the basal enlargement, which latter 

 has a length twice its diameter; terminal segment subcylindric. 

 Palpi; the second segment prolonged, slender, the third and fotirth 

 subequal, one-third longer than the second. Face yellowish. Meso- 

 notum dark brown. Scutellum reddish brown, postscutellum 

 lighter. Abdomen bright reddish. Wings hyaline, costa light 

 brown, the third vein well beyond the apex. Halteres yellowish 

 transparent. Legs nearly uniform pale brown; tarsi a little darker; 

 claws slender, uniformly curved. Ovipositor short, the terminal 

 lobes broad at base, tapering, broadly rounded. Type Cecid. 97. 



Phytophaga violicola Coq. 



, Violet gall midge 



1899 Coquillett, D. W. U. S. Dep't Agric, Div. Ent. Bui. 22, n.s. p. 48-51 

 (Diplosis) 



1901 Chittenden, F. H. U. S. Dep't Agric, Div. Ent. Bui. 27, n.s. p. 47-50 

 (Diplosis) 



1904 Washburn, F. L. Minn. Agric. Exp't Sta. Bui. 88, p. 189-90 (Diplosis) 



1905 Washburn, F. L. Minn. Agric. Exp't Sta. Bui. 93, p. 65 (Diplosis) 

 1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 59-61 (Contarinia) 



1907 U. S. Dep't Agric, Bur. Ent. Bui. 67, p. 41-42 (Contarinia) 



1908 N. Y. State Mus. Bui. 124, p. 369 (Mayetiola) 



1909 Ent. Soc Ont. 39th Rep't, p. 43 (Contarinia) 



This small, yellowish species is a serious pest in some violet houses, 

 reducing the crop from one-third to one-half and causing a consid- 

 erable loss in the aggregate. It is a local species, since one-half 

 of a house 150 feet long may be seriously injured, while the other 

 portion is almost exempt. The midges very rarely leave the plants 

 and can be discovered only by flushing them with the hand. In 

 infested houses none were to be found on the windows, in cobwebs 

 or even in sheds at the ends of the houses. The first signs of injury 

 are seen in the curling of the young violet leaves, caused by the 

 yellowish maggots. This may be so rapid that leaves perfectly 

 straight one day may be badly curled the next. 



