166 THE CANADIAN ENTOMOLOGIST. 



they stopped feeding and gathered in a cluster on the cover of the glass 

 in which they were kept, and became lethargic. Their behavior throughout 

 was like the larvce of nycteis, though they are cleaner in feeding tlian that 

 species, which keeps itself in a mire on the leaf. No web at any stage 

 was spun for protection or other purpose, and they are hybernating now 

 on a slight mat of silk made upon the cover of the glass. 



Earlier this year, May 24th, I received from Mr. Whitney about a 

 dozen larvae of this species, found by him soon after awaking from their 

 hybernation. These were of all stages from just after second moult to 

 the fifth, or the mature larva, and one made chrysalis 26th May. From 

 this the butterfly emerged 4th June. Evidently these larvae hybernate 

 after both second and third moult, as do those of phaeton and nycteis and 

 tharos, though all which I now have in hybernation (16 in number) have 

 passed the third. In all stages the larvae resemble closely those of phaeton, 

 changing from ochraceous, lighter or darker, to deep fulvous, and striped 

 with, black. So the spines and their branches are those of phaeton, and 

 differ much, from nycteis, as the coloration of the body differs. The egg 

 also is nearer phaeton \}!\di\\^nyctcis, but the sides are more sloping and less 

 rounded, and the ribs .spring from the base instead of the middle of the 

 side. The chrysalis is shaped like that of tharos, and colored like that 

 of phaeton. There is much variation in the coloration in individua-ls. One 

 of the larvae was nearly black at maturity, the fulvous being represented 

 merely by a few dots and small spots. The butterfly from this larva is 

 very melanic on both sides, in as strong contrast to the rest of the brood 

 as was the larva. The si)ecies is single brooded, \\\ie phaeton, while nycteis 

 is double brooded in W. Ya., and tharos many brooded. 



E(iG — In shape a frustum of a cone, flattened at base, the top a little 

 depressed, the sides but little rounded, ribbed, the ribs standing well 

 apart, 15 or 16 in number, and starting from the base, increasing in 

 elevation above the surface as they approach the middle, then decreasing 

 to the summit ; color lemon yellow. 



YOUNG LARYA — Length liu inch. ; cylindrical, the segments well 

 rounded ; color yellow-green, semi-translucent ; somewhat pilose ; head 

 obovoid, bilobed, the vertices rounded ; larger than second segment ; 

 color dark brown. 



AFTER FIRST MOULT— Length -iU inch. ; thicker in middle 

 segments ; armed with seven rows of short black spines, thick at base, 



