300 THE CANADIAN ENTOMOLOGIST. 



like those in geminatus. These exaggerated characters may of course have 

 been the result of figuring from a specimen with worn margins. 



In the British Museum I found a Calgary cerisyi, another from Vernon, 

 B. C, and a third from Ashnola, taken by Mrs. Nicholl. Under "Sub- 

 species of ophthalmicus Bdv.", I found Butler's type oi Vancouver ensis from 

 Vancouver Island, and other specimens from there, Frazer Pines and 

 California, which appeared to agree with it. This is the form which Mr. 

 Winn had as ophthalmicus^ and is that of which Holland figures a female 

 on Plate VII, Fig. 3, as cerisyi. Without having seen Boisduval's type, 

 which, if it still exists, is probably somewhere in France, I must assume 

 that it is the form subsequently described by Butler. All the Calgary 

 specimens at present in my collection are cerisyi, and had I even taken 

 ophthalmicus here I should probably have noticed the difference. I have 

 a series of the latter from Vancouver and the Island, but no cerisyi from 

 outside Alberta, though it evidently occurs right across the continent- 

 Besides the differences mentioned, ophthalmicus has the terminal dark 

 shade wider centrally. The two have exactly similar antennal structure, 

 and the only structural difference I can find elsewhere is in the outer mar- 

 gin which has fewer dentations and more acute apices in ophthalmicus. I 

 may be in error about their distinctness, and the point requires working 

 out carefully with far more material than I have been able to examine j and, 

 know, for all I may have been so worked out. Holland for instance states 

 that "they run into each other to such an extent as to make it often impos- 

 sible to distinguish them" and treats them as do most others, as subspecies. 

 Crenations rather than undulations is the rule throughout in cerisyi, in 

 lines, apical marks and outer margins, though I feel bound to admit that 

 the variation in my two series is such as to suggest that a large increase 

 of material might result in increased diflSculty in separating them. But 

 with closely allied species such is often the case. 



European ocellatus, of which I have four specimens, resembles oph- 

 thalmicus rather than cerisyi, though the top one of three figures given in Mr. 

 Richard South's "Moths of the British Isles" has the cranate apical marks 

 exactly as in cerisyi. The outer margin is more entire than in ophthalmi- 

 cus, and antennal structure is similar to both. 



