74 THE CANADIAN ENTOMOLOGIST. 



ten galls collected in ten seasons, roo specimens, was 91/^x213/^ mm., 

 diameter of stem below gall 5 mm. 



The galls are unicellular, the larvae for some time being closely con- 

 fined in the cells. I do not think there is ever room for them to turn, 

 and I am still in doubt as to their rather peculiar feeding habit. 



The producers winter in the larva form, within the galls, pupate about 

 May I, and the imagoes emerge from June i to July 5 ; the average date 

 of emergence is about the middle of June. From June 12 to July i I 

 have taken specimens of the mature moth, while sweeping the hand net 

 over Solidago blooms ; it is a beautiful creature, strongly marked and 

 readily recognized. The mature pupa pushes its way through the loosely- 

 closed upper end of the gall, and the moth emerges into the environment 

 of mature life. 



The largest and most common parasite is Macrocentrus pcedisca, 

 Riley, easily recognized by its long ovipositor. This parasite emerges 

 about the middle of July. 



Perilampus piatygastcr, another parasite, emerges early in July ; 

 Cryptus extremaiis still another parasite, seldom more than one individual 

 from a gall ; Pimpla anntilipes also not rare. I bred Copidosoma gelechia 

 from this gall, and once the secondary Dibrachys boucheanus. 



From a lot of galls collected near Lake Simcoe, April, 1904, as well 

 as producers and parasites, there emerged from May 2 to May 12, 1904, 

 18 specimens of a Diplosis, very much like gall producers; but, unfor- 

 tunately, from the want of material I failed to determine whether these 

 were gall producers or inquilines in Eucosma galls. The galls were all 

 similar in size, shape and structure ; normal Eucosma galls. In my notes 

 I have entered as a provisional name for this species, D. eucosfna. 



I have found this gall restricted to the one host-plant, S. Canadensis, 

 and there seems to be a fairly uniform relation between the producers and 

 parasites in the vicinity of Toronto ; so that year after year the galls are 

 about equally numerous. 



In Vol. 10, p. 202, Canadian Entomologist, Kellicott describes this 

 gall, the habits and life-history of the larva and pupa of the producers. 



Gnorimoschema aster ella, Kell. (Gelechia aster clla). 

 (The Solidago latifolia Gall.) 

 In Vol. 10, pages 203-4, of the Canadian Entomologist, D. 

 S. Kellicott describes this gall and its producer. 



