126 THE CANADIAN ENTOMOLOGIST. 



seems practically identical, and an examination of the two forms 

 from BanlY led me to believe that they might be forms of one 

 species. I have no Banff conserta in my collection, but have two 

 from Vancouver Island. In these the fringe on primaries is cut 

 with white opposite the veins, which is not the case with any of 

 my obliquata, and my suggestion was probably wrong. 



654. Calocampa thoracica Put. Cram. — Common some 

 years in September and October, and again in the spring in April 

 and early May. At light, treacle and sallows. Like most hiber- 

 nating species, it appears in greater numbers after hibernation 

 than before. I am satisfied that this is a distinct species, and not 

 a variety of cineriiia as described, and as treated by Sir George 

 Hampson. 



Ottolengui, in his "Notes on Calocampa" in Journ. N. Y. Ent. 

 Soc. X, 77, June, 1902, says: "The study of the genitalia disclosed 

 the fact that thoracica is not a variety of cineritia, as it has been 

 described and listed, but a distinct species. This I am told has 

 been corroborated by breeding, the larval stages of the two being 

 also distinct." 



Last spring Mr. Tams procured batches of ova from four or 

 five females of each species. As soon as the eggs turned colour 

 a difference was manifest in each case. The egg of cineritia is 

 uniform reddish brown. That of thoracica is yellowish white,, 

 with the exception of a spot at the top, and a ring half way between 

 that and the equator, which. are reddish-brown. The largest batch 

 of eggs procured of each species was kept, and after hatching the 

 two broods of larva:^ were carefully isolated. Both broods were 

 found to feed on several different plants, but seemed to prefer 

 willow'. No larval differences whatever could be discovered from 

 first to last. Over thirty imagines were hatched from each brood, 

 and both broods came absolutely pure. 



In the imago, the difference is almost entirely one of colour. 

 The ground colour of both may be described as blue-grey, but the 

 grey is far brighter and more silvery in thoracica. The yellowish 

 streak from the reniform to the s. t. line is less conspicuous, and 

 the area immediately above it always a brighter grey than in 

 cineritia. Perhaps the most easily expressed distinctive character 



