Studies on Life-history of Bomhycine Moths. 89 



plete its growth before the autumnal frosts set in at the end of 

 September, and it is thus compelled to winter over, as is the case 

 with some butterfly larvse, before the last stage. It will be inter- 

 esting to ascertain whether this is the case with the more southern 

 California species, and those of Scepsis. 



The young larva of Ctenucha cressonana Grote ? 



In March, 1890, I received from Mr. T. A. D. Cockerell, of CliflT 

 County, Col., a larva which had hibernated. It could not be kept 

 alive. It is evidently a Ctenucha in the penultimate (5th) stage, 

 and congeneric with Ct. virginiana in its hibernating or penulti- 

 mate (5th) stage; and as C. cressonana is the common species in 

 Colorado, I am disposed to refer it to that species. 



When disturbed it lies curled up on its side, the black dorsal tufts 

 projecting like spikes, and the head touching the tail. 



Length 18-20 mm. The head is nearly as wide as the body, 

 reddish-yellow, but not so deep red as in Cf. virginiana, and with- 

 out the two diverging black bands in front. The body is not so 

 densely hairy as in the 5th stage of Ct. virginiana, but is more as 

 in stage IV of that species. The body is now scarcely concealed 

 by the rather sparse hairs. The body is dark leaden, and the verti- 

 cils of hairs are also dark. There is a distinct subdorsal yellowish, 

 and a whitish lateral stripe. On the thoracic segments there are 

 rather long hairs, which arch over the head. On each of the 

 abdominal segments 1-8 there is a long double dorsal pencil of 

 black hairs, the first one inclining forwards, and the last one back- 

 wards, the others being more or less erect. All the legs, both 

 thoracic and abdominal, are yellowish, the latter distinctly so. 



The larva of Phryganidia californica Pack. 



These larvas, two living examples (and others dead), were described 

 May 5th, and others June 5th from life, while the colors were still 

 fresh ; most of them had pupated. They were sent April 30th by 

 Prof. J. J. Rivers. 



Full-grown larva. — Length 12-15 mm. The head is a little 

 wider than the body; it is large, full, globose, smooth, with a few 

 long scattered hairs ; pale flesh-colored, with an oblong black patch 

 on each side extending upon the black mandibles ; labrum pale. 

 The body is cylindrical, of the same width to near the end ; the 

 Annals N. Y. Acad. Sci., VIII, May, 1893.— 7 



