56 THE CANADIAN ENTOMOLOGIST. 



precisely same coloration are sometimes quite unsilvered, in other cases 

 they are thoroughly silvered on every spot. Variations of the ground 

 color show a range from diluted ferruginous to brown, and in many in- 

 stances both sexes are equally and well silvered throughout. In both 

 Zerene and Monticola every phase of color of under side of hind wings in 

 one sex can be matched in the other sex, and I count seven varieties 

 which are readily distinguishable ; and where Zerene ends and Monticola 

 begins I cannot decide. I am disposed to think, considering that all 

 these variations occur in one locality, that the two forms represent one 

 species, as Dr. Boisduval surmised. If Zerene type was peculiar to one 

 district and Monticola type to another, I should hold them to be two dis- 

 tinct species, always bearing in mind that a species is but a permanent 

 variety. Continuing the series of my catalogue, these species would then 

 read thus : 



127. Hesperis, Edw. 



Sub-group. 



128. Zerene, Bois., 1852. 



Var. Hydaspe, Bois., 1869. 



Zerene, Behr, 1862. 



purpurascens, H. Edw., 1876. 

 Var. Monticola, Behr, 1862. 



DESCRIPTIONS OF TWO SPECIES OF AGROTIS, AND TWO 



OF APATELA. * 



BY A. R. GROTE, A. M., 



Director of the Museum, Buffalo Society Natural Sciences. 



Agrotis vocalis, u. s. 



$ °. . This species seems allied to albalis and lagena. The hind wings 

 are whitish ; the fore wings are mixed gray, black and white. The lines 

 are black, thick, single, dentate, the subterminal obsolete. A slight black 

 basal submedian streak. Orbicular whitish gray, pear-shaped, lying 

 parallel on the cell, tapering outwardly, cell shaded with black, the spot 

 edged with black, not quite attaining the inner edge of the reniform, 



