328 NEW YORK STATE MUSEUM 



BALDRATIA Kieff. 



This genus, as we understand it, may be easily separated from 

 Lasioptera and its allies by the palpi having but one or two seg- 

 ments. The American forms breed for the most part in the pecu- 

 liar, apparently fungus-infected blister galls so common on Aster 

 and Solidago. 



Key to species 

 a Tarsi distinctly white or yellow banded 



b All tarsal segments with yellowish white bands basallj', the 5th on 

 the posterior legs yellowish ; male and female with 16 antennal 

 segments ; palpi biarticiilate ; breeds in oval, black, blister gall 



on E u t h a m i a 1 a n c e o 1 a t a 



(Lasioptera) c a r b o n i f e r a Felt. C. ai354 



bb Posterior tarsi only narrowly annulate basally with whitish; female 



with 22 antennal segments; palpi probably biarticulate ; breeds 



in a rosy blister gall on Solidago r u g o s a 



(Lasioptera) rosea Ftlt, C. a 1474 

 aa Tarsi unicolorous or nearly so 



b Adbomen conspicuously yellowish in part at least 



c Abdomen light fuscous yellowish ; antennae with 13 segments ; 



palpi uniarticulate ; bred from Solidago 



s o c i a 1 i s n. sp., C. ai568 1 



cc Abdomen with the basal segment fuscous yellowish ; male with 



12 to 14 antennal segments; palpi uniarticulate; bred from 



Erigeron 



(C h o r i s t o n e u r a) m o d e s t a Felt, C. ai427, ai666, ai666a 



bb Abdomen dark brown, scatteringly clothed dorsally with silvery white 



scales; male with 14 antennal segments; palpi uniarticulate; breeds 



in yellowisli or brown blister galls on Aster 



(C h o r i s t o n e u r a) p a n i c u 1 a t a Felt, C. 757, ai 167 

 bbb Al^domen dark brown or black 



c Basal abdominal segment yellowish or silvery white 



' d 2d to 6th abdominal segments margined posteriorly; female 

 antennae with 26 segments; palpi uniarticulate; bred from 



a grape petiole gall petiolicola n. sp., C. 877 



dd 3d to 6th abdominal segments margined posteriorly; female 



antennae with 18 segments ; palpi uniarticulate 



f 1 a V o s c u t a n. sp., C. 1288 

 cc Abdominal segments with wliitish submedian spots 

 d Segments i to 7 spotted 



e Male antennae with 14 segments; palpi uniarticulate; 



brecl from small pnstrlatc ga'l on Aster stem 



p u s t u 1 a t a n. sp., C. aiS20 

 ec Female antennae with t8 segments; pali)i biarticulate; 



taken on Solidago 



(C h o r i s t o n e u r a) a 1 b o m a c u 1 a t a Felt, C. 758 



