
No. 468.) THE WILLOW CONE GALL. 869 
Salicis strobiloides on Salix cordata; gall Salicts strobiliscus on 
Salix bebbiana ; gall Salicis gnaphaloides on Salix bebbiana , gall 
Salicis rhodoides on Salix humilis. 
GUESTS AND PARASITES. 
While I was gathering material for the study of the gall gnat 
I bred as many as possible of the other insects which inhabit the 
galls. These include not only the inquilines and the transient 
guests, but also a number of parasites which live on these inqui- 
lines or on the gall maker. 
In making my table of results I have included a few species 
bred by Professor J. G. Needham from cone galls and from the 
galls S. rhodoides and S. brassicoides during the spring of 1904. 
List of Insects bred from Galls. 












Ss = 3 2 
ifii 
ulws[^|^? 4 
5/5| 5/5] 5 
Gall maker. 
Rha ARAS strobiloides O. S. X|X|X|X 
Án jephage brassicoides Walsh x 
Inquilin 
Cecido omyia albovittata Walsh n X|X|x 
aitophorus sp. (plant louse) Bu (qiu dU do a 
Pontania pisum sh (saw fly) . - ME 
Euura noda Walsh (saw fly X xXx. 
Xiphidium ensiferum, eggs miado grasshopper). MUTEX 
spring-tail (Thysanura) : XXIX 
Acleris d en. (a moth) : x 
Larvz of a Noctuid ( set ipi 3 XIX 
Larva of Tineid m (Lepidoptera) x 
Larva - Thyridopteryx ephemeraformis e (Lepidop- : 
Parasites and h perparasites : 
Te cs p pd X|x x 
Tetrastichus sp ve iie X|x x 
Tetrastichus Sp. x x 
Polygnotus vafa even Ashm. (a Proctotrupid) KIX x< 
Eurytoma studiosa = " (a Chalcıd) X|xX x 
Pteromalus sp. (a ci x x 
Torymus popenoi Nes gr Chalcid) . A x x 
Aphanogmus virginiensis Ashm. : XIX 

