THE CANADIAN ENTOMOLOGIST. 27 



disappeared, or were represented by a faw specimens worn almost beyond 

 recognition. I had about given up meeting with ifiierrogationis that 

 spring, when on the i6th of May I captured a large but badly worn 

 iivibrosa fluttering over lilac blossoms. I was surprised that it should be 

 of this form instead of the more common Fabricit, but what was my 

 astonishment to see four or five more of the same form the same day. 

 During the rest of May and first part of June the species was common, 

 but not one Fabricii was seen. A large female was captured while 

 ovipositing on elm, and netted over a branch of that tree. She deposited 

 a large number of eggs indiscriminately on leaves, branch, and net, in most 

 cases singly, but in a few instances in "chains" of three or four. In 

 order not to disturb the eggs, I let the net remain as it was until the larvaj 

 should hatch, and then, thinking that the larva? would do better in the 

 open air, left it until they had passed the second moult, when on removing 

 it I found only eight remaining. These pupated without further accident, 

 and on the 13th of July and the few days following five imagoes emerged 

 — three Fabricii and two umbrosa. This was after the larger part of the 

 brood oi j-albicm had emerged and several weeks after the first brood of 

 comtna, and as the former species is probably but single brooded here, I 

 v/as not expecting a second brood of interrogationis. It was with some 

 surprise, therefore, that a large colony of young larvpe were discovered in 

 the latter part of August feeding on the heads of hops. Later several 

 other colonies were found on hop and elm, and a number of larvte were 

 transferred to my breeding-boxes and carried successfully to pupation, but 

 as many of the pupse rotted, only about thirty imagoes, all Fabricii, were 

 obtained. The last specimen, delayed by a long continued "spell" of 

 severe weather, did not emerge until November 6th, after being in the 

 pupa state nearly six weeks and freezing at least once. It was smaller 

 and darker than the average, but not otherwise remarkable. 



Now, the question which I wish answered is, Where did the large 

 number of umbrosa come from that appeared here so suddenly in May ? 

 They certainly did not breed here, because every specimen seen was 

 badly worn, and they could not have flown in any such numbers either 

 the same spring or the fall before, and besides, the fall before it was 

 Fabricii that was in the majority. The only explanation which I can 

 offer is that they migrated thither from some other locality, probably in 

 the South. Pyrameis atalanta appeared about the same time in very 

 large numbers, but as the species has always been more or less common, 



