THE CANADIAN ENTOMOLOGIST. 305 



This is a very distinct race.f The moths are noticeably different, and 

 can usually be readily picked out. The larvse, too, differ from both the 

 other races, being intermediate between the two. They are subject to a 

 wonderful amount of variation, as I have elsewhere pointed out,* some 

 examples closely approaching the larva of inaculata, though the inter- 

 mediate, typical form is quite different. 



The above conclusions have been reached after breeding larvae at 

 various points on the Pacific Coast, and I have been assisted by informa- 

 tion kindly given by Dr. H. H. Behr, of San Francisco, and by Prof. 

 O. B. Johnson, of Seattle. 



Halisidota (Lophocampa) argentata, Packard. 



race sobrina, Stretch. 



race subalpina, French. 



Almost strictly parallel to the preceding,. H. argentata presents three 

 local races. The Eastern one, subaipina, French, does not reach to the 

 Atlantic States, nor probably even to the Mississippi Valley. It may be 

 said to inhabit the Rocky Mountain region. Its larva is unknown, but 

 the moth approaches II. argentata so closely, that I can find no distin- 

 guishing characters. The ground colour seems a little more yellowish, less 

 densely covered with brown, but I doubt the constancy of this obscure 

 character. Prof French compares his moth with H. scapularis, Stretch 

 { = i?igens Hy, Edw.), a very distinct insect, and I can only account for 

 his failure to mention argentata, by the supposition that he did not 

 possess specimens of it. If he had, it seems doubtful that this race would 

 have ever received a name. 



The race argentata proper inhabits the Sierra Nevada of California and 

 the Pacific Northwest. It is abundant where found, its larva feeding on 

 various coniferse. 



In the coast region of California we have, again, the most distinct 

 race, sobrina. Stretch. Both moth and larva present perceptible differ- 

 ences. The white spots on the wings are smaller, and the brown ground 

 colour more even and less irrorate, though the difference in coloration of 

 the thoracic and abdominal parts as exhibited in Stretch's figure does not 

 exist. The differences in the larvif have been pointed out by Hy. 

 Edwards, though he makes more of the slight differences than seems 

 justifiable to me ; they are not nearly so striking as his remarks would 



* Psyche, VI. 323. f Dr. Behr considers it to be a valid species, and there is much 

 in favour of his view. 



