REPORT OF THE STATE ENTOMOLOGIST 1907 BOan 
Members of this genus display a marked preference for flower 
or bud galls, a very large proportion being reared from de- 
formed buds, among which may be classed the conspicuous 
apical rosette galls, the less conspicuous flower or bud galls and 
the reduced flower heads. A number also breed in leaf galls 
Buch, forexample, as R.pedicellata and R.fusiformis, 
both of which inhabit a very characteristic type of gall appear- 
ing on the stem, the leaf or even in the flower head. 
Certain species breed in bud galls near the base of the stem as, 
for example, Ro bulbula, and one species, R.thompsoni, 
min the root stock. The well known R. hirtipes is unique 
among our eastern forms, in that 1t produces a very character- 
mistic gall on the stem. Phis latter exception, however, is more 
apparent than real, since the original point of attack is undoubt- 
edly on the young growing stem, and it might be considered 
as an injury just falling short of the terminal bud. The last 
named species is easily separated from allied forms. . American 
members of this genus display a marked preference for Solidago, 
some fourteen species having been reared therefrom, while tne 
closely allied Aster supports three additional forms. Each of 
the species of this genus producing a gall on Solidago, makes a 
characteristic deformity which appears to be correlated with well 
marked structural differences in the adult, and presumably by 
divergencies in habits. 
: ; Key to species 
a Antennae with 20 or more segments 
b 24 to 25 antennal segments; abdomen dark reddish brown; palpi 
biarticulate; female, bred from loose, rosette galls on Solidago 
Coa Mea (pestlisuie Smeets ernie la Pabcrint Cue Ollie ta, Sn Cy alos 
bb 22 to 23 antennal segments 
c Abdomen dark brown; legs dark brown; antennal stem ™%4 
longer than the basal enlargement; palpi biarticulate; male 
gavel jose lel AC, yo) 
cc Abdomen reddish brown or brownish red; antennal stem in 
male 34 and in female % the length of the basal enlarge- 
ment; male and female, bred from subglobular stem gall 
Ole SONdACO wees oe Flbeae pian Gente reeMeataicirrey Utena Peas 
(Cecidomyia) hirtirpes ©: S. ©: aroso, a12c4 
bbb 20 to 21 antennal segments 5 
c Antennal stem ™% longer than the basal enlargement; abdomen 
fuscous yellowish; legs fuscuous yellowish 
d Palpi biarticulate, the basal enlargement with a length 
twice its diameter; male, bred from terminal rosette 
Sail orm Soller) Ge ogy jae Garp aaa anes pr | @enai7.50 
