Sept. 1894.] TOWNSENI). On CiAII. OK EUURA OKIillAI IS 103 



heads, and a blackened pupa probably of ihe latter. There were 

 either two of the first in one gall, or two of the second, or else one 

 of each, each one of the seven galls having always just two occu- 

 pants. The small white larvae are those Of a hynienopterous 

 parasite. The sawfly is the gall maker. When the larv;\; of the 

 latter occurred in the gall the channel was accordingly large and 

 fdled with much frass. The cells containing the small white 

 parasite larvi\i were much smaller. The parasite was bred and 

 determined as Eioytoma stuJiosa Say. 



These galls extremely resemble those of Cecidomyia rigii/u\ 

 O. S., ealls of which species have been sent me by Mr. T. 1). A. 

 Cockerell, collected at West Cliff, Colo, (see Ckll., Entom , 1890, p. 

 278). The three galls sent me by Mr.Cockerell are of somewhat diffe- 

 rent form from the tenthredinid galls above mentioned, and were 

 very evidently formed near terminal end of shoots. They are from 

 I to 2^2 times as long as broad, one being quite rounded in outline- 

 They measure 10 mm , 15 mm , and 20 mm in length ; and 8 mm., 

 7j^ mm., and 7 mm. in greatest width respectively. 



The galls collected in the (irand Canon, July 11, are not as 

 large as those just mentioned from Las Cruces. They were more 

 frecjuently near the terminal portion of the shoot. Most of them 

 are considerably shrivelled, having been apparently made in the 

 recent growth near terminus, and measure from 17 to 32 mm. in 

 length, and 2)2 to 4^ mm. in greatest width. Two others that 

 are not shrivelled measure 22 and 24 mm. in length, and about 6 

 mm. each in greatest width. 



The galls which I collected in the (Irand Caiion, and at Las 

 Cruces, are generally somewhat more elongate in form, and usually 

 occurred at a considerable distance from the terminal end of the 

 shoot, though some were observed to be more or less terminal. 

 The measurements of 40 galls collected at Las Cruces, Nov. 14, as 

 above referred to, are as follows : From 7 mm. in length, by 5 

 mm. in greatest width ; to 50 mm. in length, by 8 mm. in greatest 

 width. These are the shortest anil longest. Another one which 

 measured nearly 50 rnm. long, was about 7)^ mm. wide. The 

 narrow^est measures hardly 4 mm. in width, by al)out 21 mm. in 

 length. The next narrowest is 4'j by 11 mm. There were none 

 wider than the above mentioned longest one. Two which were 

 same width, 8 mm., measure 19 mm. and about 23 mm. in length. 

 The average full size of these galls is about 7 mm. in width, by 

 from 27 to 31 mm. It will therefore be seen that they vary much 



