' OF NORTH AMERICA. 189 



with an albino from E. egle, and that the insect now under consider- 

 ation is specifically distinct, exhibiting not merely colorational but also 

 structural differences, although Dr. Packard states, (Proc. Ent. Soc. 

 Phil., p. 130, 1864), that "from the same brood of larvae, Mr. Shurt- 

 leff has raised both the typical forms, (of E. egle), and a white variety 

 which agrees well with Dr. Fitch's description of Hyphantria collaris.'" 



Six specimens of E. collaris, three from California and three from 

 Pennsylvania, show the following points of difference as compared 

 with three specimens of E. egle : The costa is more convex, and the 

 width of the primaries, as compared with their length, is greater ; the 

 posterior wings are more ample ; the body is much slenderer, especially 

 in the ? , which also wants the woolly tuft so conspicuous in E. egle. 

 These differences, which fully warrant Boisduval's "statura gracilior," 

 would indicate its specific difference independently of the marked dis- 

 similarity in color. I am therefore forced to the conclusion that writers 

 who were unacquainted with this form, have sought, and suspected 

 that they had found the Hyphantria collaris of Dr. Fitch, in albino 

 forms of E. egle. 



Its early stages are, unfortunately, unknown, though Mr. Strecker 

 writes me that the milkweed {asclepias) is common where the speci- 

 mens which he sent were taken. The history of this species now be- 

 comes an interesting question, and one which will, I trust, engage the 

 attention of persons living where collaris and its congener egle are 

 abundant. With our present knowledge of the imago only, it requires 

 a very broad interpretation of the term "species'" to include them un- 

 der the same specific name. 



4 -EUCH.ffi:TES EIEGANS. N. S. (Plate 8, fig. 6, ^ ., 



3 . — White. Head and palpi white, the latter rosy at the base, and 

 the former very narrowly rosy behind, particularly near the eyes. An- 

 tennae white, pectinations black. Prothorax patagia, and thorax white. 

 Abdomen rosy above, dusky white beneath, with a faint dorsal row of 

 whitish spots, centered with dusky, and a lateral row of black spots. 

 Legs whitish, with the coxae of the anterior pair pale rosy. 

 Wings pure glossy white, immaculate. 



? . — Similar to 5 , except that the colors of the abdomen are less 

 distinct, and the last segment of the abdomen is tufted with dense 

 whitish hairs, somewhat as in E. egle ? . 



