150 THE CANADIAN ENTOMOLOGIST. 



Gen. Theria Desv. 

 Spec. 26, 27; can not name the two species. 



[6 spec; all N. York, Manlius, Aug. 21-27, Sept. 6; Cayuga Lake, 

 June 19; Comstock.J 



Family Tachinidae. 



Sectio. Phasina. 

 Gen. Xysta Meig. 

 Spec. 28. One female spec, N. Hampsh. 



[This specimen is different from the type of X. didyma Loew. The 

 type described was a male from Illinois ; the only male in L. coll. 

 with label on the pin has a white square label with an R., similar 

 to those with green square label from Red River of the North. 

 Besides stands a female from Texas, less than half as large ; per- 

 haps not belonging here.J 



Family Dexidae. 



Gen. Prosena. 



Spec. 29. One spec, from Cuba. [Differs from Loew's type, P. mexicanai\ 



Genus Miltogranima Meig. 

 Spec. 30. [There are 5 spec, from Cambridge and Dorchester, Mass.; 

 Trenton Falls, N. Y.; Colorado Mts., Carpenter; probably belong- 

 ing to different species.] 

 Spec. 31. \Sarcophaga midipetuiis Loew.; bred from mud cells oi Pelopaeus 

 by W. H. Patton, Waterbury, Conn., Aug. 24; see Packard's Guide 

 p. 408. One of the spec, by Mr. Meade labeled Miltograinina 

 Meig., the other one Miltogra7nma ? Meig. There are in Loew's 

 two spec, with corresponding number, and label in his hand- 

 writing. 



ON SIMULIUM. 



BY DR. H. A. HAGEN, CAMBRIDGE, MASS. 



I have received from Mr. H. G. Hubbard some larvse and pupae, with 

 the case, labeled as follows : " The Simidiuiii larvae and pupa were col- 

 lected on the rocks at the foot of the falls of Michipicotin River, Lake 

 Superior, in shallow pools and gutters of rapid water. There were large 

 patches of rock surface densely covered with either the larvae or pupae, so 



