18G4.] 535 



variation. I am inclined to believe it distinct, however, and wait the 

 discovery of fresh material to confirm me in this opinion. 



From A. cognataria Guenee, our commonest species, the present is 

 easily recognisable ; from A. panvidat<tria Grote, which I have some- 

 what inade(|iiately illustrated, the present species diifers in the orna- 

 mentation of the anterior wings, and wants the large distinct irrorations 

 and black collar. It is possible that A. sperataria Walker is identical 

 with this latter species, of which I cannot be certain, from the some- 

 what short diagnosis in the B. M. Cat., and at the time I published the 

 species I was uninformed of the existence of Mr. Walker's description. 



Notes on Certain Species of North American LEPIDOPTERA. 



BY AUG. R. GROTE. 



Gorgopis 4-guttatus, Grote. 



In response to my query, Mr. Walker kindly informs me that the 

 specimen referred to in the Lep. Cat. B. M. as Hepialus argcntcomac- 

 ulatus var. ? belongs to the present, and not to Dr. Harris' species, and 

 I conjecture that the $ specimen mentioned by Dr. Harris in Agassiz's 

 •' Lake Superior," as coming from that latter region, should also be re- 

 ferred to this species, which is readily distinguished from the Eastern 

 argcnfeomacu/atus, Harris, by the smaller white guttations of the ante- 

 rior wiugs, surrounded by black annuli, and the grayish pink or pale 

 salmon color of the metathorax, abdomen and posterior wings. 



Lithosia argillacea, Packard. 



My specimen, a female, the abdomen distended with eggs, was taken 

 by Mr. Robert Kennicott on the Athabasca River, and suffered during 

 the transportation, the under surface becoming discolored through some 

 extraneous substance, giving the specimen a concolorous appearance, 

 which I erroneously accepted as the proper coloration of the species ; 

 on submitting the specimen to certain tests, the small palpi are plainly 

 yellow except at their tips, coxae and terminal abdominal segment 

 clothed with hairs of the same color, so that notwithstanding the dif- 

 ferent latitude of occurrence and smaller size of L. bico/or, Grote, I 

 consider it identical with the species from the Eastern States. Although 

 the name I proposed for this species would apparently have the priority, 



