THE CANADIAN ENTOMOLOGIST. 153 



Doubledayi Guen., Mass. (in July); N. Y.; Penn. 



BoMBYCiA Hubn. 



improvisa Hy. Edw. Wash. Territory, 

 semicircularis Grote. Wash. Territory. 



N. B. — Mr. Walker describes a '' Cymatophora caniplaga'' from Can- 

 ada ; I do not know it and the type must be examined to see if it belongs 

 here. 



Thyatira Ochs. 



lorata Grote. Wash. Territory. 



pudens Giien. Anticosti ; Can. to Penn. 



PSEUDOTHYATIKA GrOte. 



cymatophoroides Gueii. Can. to Penn, 



expultrix Grote. Same localities, also B. Col. (teste Hy. Ed\v.) 



Habrosyne Hubn. 



scripta Gosse; abrasa Guen., Alaska?; ^'ictoria? (derasa Hy. Edw.) 

 Canada to Pennsylvania. 



N. B. — This species is very near the Euroi:»ean derasa, but is consid- 

 ered distinct from a comparison of the imago by Gosse and Guenee. I 

 have given the differences as they ap])ear to me (Proc. Ent. Soc. Phil., 2, 

 58). It seems to me better where differences occur to keep distinct names 

 for these " representative species " or '• geographical varieties." They 

 are connected with the series of distinct sjjecies by forms differing more 

 or less notably, and in this case it is difficult to decide where the 

 "species" commences and the "variety" ends. But it is quite unexact 

 to lump species in the moths as has lately been attempted in the pages of 

 the Brooklyn Ent. Society's periodical, without exact information and 

 merely on the general principle that there are too many " species " in our 

 lists. This may indeed be the case, but tlie way to prove it does not lie 

 in slurring over noted characters or quoting opinions which do not rest on 

 solid foundation. More confusion is created by throwing together distinct 

 forms under one name than in keeping varieties under specific titles. 



