Lepidoptera ■ 31 i 



FAMILY ARCTIIDAE. 



Genus Lexis Wallgr. 



Lexis bicolor Grt. 



Lithosia hicolor Grt.: Proc. Ent. Soc. Phil., Ill, 74, 1864. 



In the Canadian National collection there is one specimen of this widely 

 distributed species from Sixtymile river, along 141st meridian riTer, Yukon 

 Territory, 1907 (Thos. P. Reilly). 



Genus Hyphoraia Hbn. 



Hyphoraia parthenos Harr. 



Arctia parthenos Harr.: Agassiz's Lake Sup., 309, 1850. 

 One specimen in the Canadian National collection from the following 

 Yukon locality: Stewart river, above Frazer falls, June 15, 1905 (J. Keele). 



Hyplioraia alpina Quens. 



Bombyx alpina Quens.: Acerbi's Travels N. Cape, II, p. 253, pi. 1, f. 4 

 (1802). 



Four specimens reared from larvae or cocoons collected at Collinson point, 

 Alaska, emerged July 27, August 3, 14, September 2, 1914, 3 males and 1 female 

 (F. Johansen). One of the males is' shown on PI. V, fig. 18. 



All of the specimens are in general similar in appearance and resemble 

 fairly closely Seitz's figure of alpina Quens. ( = thulea Dalm.y In these specimens 

 however, the pale coloured spots on the wings in both sexes are decidedly yellowish 

 almost a cream-buff^ not whitish as in the figure referred to above. Hampson^ 

 also_ refers to the spots as being white in the female. The male antennae in 

 this species are serrate differing from the antennae of the foregoing species 

 which are pectinate. 



The larvae and cocoons were collected on the tundra, by Mr. Johansen, 

 in the months of May, June, and July. They emerged on the dates mentioned 

 above. (Breeding record 33.) 



The following brief description of the larva has been made from a cast 

 skin removed from a cocoon : 



Head 3 mm. wide, rounded, somewhat quadrate, black, polished, setae 

 black; mouth parts reddish. Body blackish, tubercles large and conspicuous, 

 each bearing a bunch of rather long stout hairs, slightly spinulose. The hairs 

 on the dorsum and upper lateral area are yellow and brown intermixed, those 

 along the lower lateral area being of a darker brown shade. Thoracic feet 

 black, reddish at ends; prolegs concolorous with venter. 



The cocoon, figured on PI. Ill, fig. 8, varies in size from 16-20 mm. in 

 width to about 36 mm. in length. It is rather thin, the pupa inside being 

 readily observable. In colour it is yellowish-white. 



Pupa. — Length 19 mm., width at widest part 7 mm.; black, polished, 

 anterior half of abdominal segments slightly pitted and with short setae, posterior 

 half smooth. Wing-cases and thorax slightly wrinkled. Cfemaster roughened, 

 reddish, shaped as shown on PI. Ill, fig. 10, and bearing a conspicuous bunch 

 of long, rather slender, dark reddish or blackish bristles slightly curved at ends. 



In addition to the above specimen, Mr. Johansen collected a cocoon of 

 what I take to be of this species, on Herschel island, Yukon Territory, end of 

 July, 1916. It was parasitized by Amblyteles species^ which emerged on August 

 8, 1916. 



1 Ma^rolep. World, Div. 1, Palaearctica, Vol. 2, pi. 17c. 



2 Ridgway's Color Standards and Nomenclature, 1912. 



3 Cat. Lep. Phalffinse in B.M., III, 223. 

 * Det. by C. T. Brues. 



