368 NEW. YORK STATE MUSEUM 
dd Palpi uniarticulate 
e Abdomen yellowish; mesonotum reddish brown; 
female, bred from apical rosette gall on Euthamia 
lanceolata: ns sp, © 787 
ee Abdomen reddish or light’ yellowish brown; meso- 
notum reddish brown; female, bred from a hollow 
gall on Bigelovia....bigeloviae Ckll, C. 1070 
bbbb Antennae with 13 to 14 segments 
c Abdomen brownish red; mesonotum reddish brown; female, 
bred from suboval flower or bud galls on Gutierrezia....... 
(Asphondylia) ¢utierreziae Chil, © ar7a2 
cc Abdomen and mesonotum dark brown; female, bred from gall 
On Alidibertiae grease audibertiae Felt} €. 1020 
bbbbb Antennae with 12 segments 
c Antennal stem with a length 34 that of the basal enlargement 
d Abdomen and mesonotum dark brown; palpi uniarticu- 
late; male, bred from gall on Audibertia..............- 
audibertiae Felt, C. 1029 
cc Antennal segments sessile or nearly so 
ad Abdomen pale yellowish; palpi biarticulate ............. 
(Oligotrophus) Sackenomyia acerifolia Felt, C. 38 
oLIGoTROPHUS Latr. 
This group, as at present restricted, comprises a number of forms 
related to Dasyneura and Rhabdophaga and differing therefrom by 
having the claws simple. It is separated from more closely allied 
genera by the triarticulate palpi. The wing is illustrated on plate 
BO, ISAS It, 
Key to species 
@ 13 or 14 antennal segments; abdomen dark brown 
b 13 or 14 sessile antennal segments, the 5th with the basal enlargement 
% greater than its diameter, the 3d palpal segment twice the length - 
ofsthe*2d<" female, bred trom Betulansecdsy ecm acrets ie es ee eiere 
. betulae Winn., C. 964 
bb 14 subsessile antennal segments, the 5th with a stem about 4 the 
length of the basal enlargement, which latter has a length twice its 
diameter; the 3d palpal segment is 3 times the length of the 2d; 
PEMaAle ee eC ncn ease eee ere eon le oretan vernalis n. sp, C. 60 
aa I5 antennal segments 
b Abdomen dark brown, the 5th antennal segment with a stem % the 
e 
length of the basal enlargement; male, bred from Betula seeds.....- 
betulae Winn., C. 964 
aaa 16 antennal segments 
b Abdomen fuscous yellowish, the 5th antennal segment with a stem 4 
longer than the basal enlargement; bred from an apical rosette 
cell Gm SOCESOs cosscosccusccus 66 inquilinus n. sp. C. at655a 
