19071 
THOMPSOX — GALLS MADE BY CYCLORRHAPHOLIS FLIES 
71 
THREE (lAT.LS MADE RY CV(’L( IRRHAPIR >U.S FLIES. 
OY MILI.ETT T. THOMPSON, WOUCESTER, MASS. 
Trypetidae. 
In Aldricli’s “(’:italo<!:ue of Nortli .American l)i|)tera” (‘iglit .spccie.s of the 
'I'rvpelidae are recorded a.s enll-makers; viz. 
notata (’oqiiillett, (I'idiasjn.s atra Loew, <E. 
polita Loew, Aeiura a])lopappi Cociuillett, 
Eutreta diana Osten-Sacken, Euro.sta lagloHae 
Coekerell, and E. .solidagini.s Eiteh. Alore 
complete knowledge of tlie life-hi.stories of this 
family will undoubtedly increase the list. In 
each ca.se the gall is formed on some Composite 
])lant, three of the above species — <Ediaspi.s 
atra, <E. polita and Enrosta solidaginis — at- 
tacking the genus Solidago. Material collected 
at Worcester jMass., during the past few months 
enables me to add Eiiroftia refirulata Snow, and 
F.ulrelci xparna Wiedemann. Roth make galls 
on the ( iolden-rod, and in this locality the galls 
have been found only on a large, smooth 
s])ccies, abundant in waste sandy fields, which 
1 have not satisfactorily determined, |icrhaps 
.Solidago juncea. Rut as the.se flies have a wide 
distribution, it is quite ])robable that other 
species also serve as the host-plant. 
Euroxta rctinilctin (Figure 1). The gall is 
a hollow cylinder, about two centimeters long 
by a half centimeter in diameter, evidently an 
aborted and transformed growing-shoot. 'Fhe 
tip of the gall jirojects above the surface ot the 
ground. Externally, traces of leaves a|)j)car in 
the form of imbricated scales, the \ip])ermost 
of which may — |)articularly as the S])ring 
advances — s|)read apart and show considerable 
Trypeta baccharis Coquillett, T. 
Pi 
Figure 1, Gull of Eurosta reticulata. 
