THE CANADIAN ENTOMOLOGIST. 235 



Denver he wrote me he had concluded to come back to that place after 

 he had worked at Mt. Gibson, and go home. Thereupon I divided the 

 six lots of Papilio larvte, and sent him one brood of Of-egojiia and two of 

 Bairdii) and, although he did return to Glenwood Springs, 28th July, I 

 had no more to do with his half of the larvae. Thenceforth we made no 

 more efforts to get eggs, as it was not worth while to try and rear larv.ie 

 in New York or in West Virginia, by reason of the great mortality 

 sure to be suffered in feeding with umbelliferous plants. Mr. Bruce 

 made many excursions in the hope of taking typical Hollaiidii of both 

 sexes, but in vain. On one occasion he brought in a single Neophasia 

 Menapia, and several times Argynnis Lcto, now fresh from chrysalis. 

 On 30th July, several fresh males of Argynnis Nevadensis, evidently of a 

 second brood, and thirty Bairdii and Oregonia. The next day I went 

 with him to the place where the Papilios had been taken, along the 

 railroad up the Roaring Fork of Grand River. There, on thistles 

 exclusively, we took thirty-four more Bairdii and Oregonia. A field of 

 alfalfa was in flower just over the fence, but the Papilios did not frequent 

 that. There were, however, on the alfalfix many of the yellow form of 

 Eurytheine ; namely, form Eriphyle., Edw. This form was often seen 

 within the grounds of the Hotel, and elsewhere as we rode about the 

 region. But I never saw an example of the orange form or forms (for 

 there are three of them), nor have I ever seen a live Eurytheme, orange. 

 Mr. Bruce says that when he first collected in Colorado, in 1888, the 

 orange was not uncommon, either in the Denver district or at Glenwood 

 Springs. But year by year he has noticed the diminishing number of 

 the orange, and the increase of the yellow form ; and it is his opinion 

 that cultivation of alfalfa is responsible for this change. 



On our way up the Rocky Fork we passed a slaughter-house in a 

 small hollow, which was at the foot of a lofty and precipitous cliff of red 

 sandstone ; and about, on the ground, fences, and roof, were perhaps 

 three-score ravens and half as many magpies, not at all shy or difficult to 

 approach. We were told the ravens made their nests on the adjacent 

 cliffs. Now, in all my years before I never saw more than two or three 

 ravens, and then flying half a mile high in W. Va. 



Besides the species of butterflies enumerated, I find but one other 

 noted down as seen at Glenwood, and that was Satyrus Boopis, of which 

 two exaniples were taken. Our conclusion on the butterflies in general 

 was that while individuals were plenty, the species were really few ; and 

 probably nothing else should be looked for in a semi-desert region. 



