434 LÉPIDOPTÉROLOGIE COMPARÉE 



nally than that of heienœ, is greyish and, as usual, black spotted. 

 The tvvo more prominent spots and the four little tubercles on 

 the edge, follow pomonaria. 



The ventral stripes are further apart and are distinctly nearer 

 zonaria than those of heienœ. The subspiracular stripe and its 

 edging are very degenerate but are a little better marked at the 

 beginning of a segment. Between this and the spiracular stripe, 

 are a few faint irregular yellow freckles. The spiracular stripe 

 is broad and of the zonaria type and may just touch the black 

 spiracles on its upper margin. The legs and prolegs differ in 

 no respect from those of heienœ. 



Variation of larva. 



It is worthy of note that both in this hybrid and in heienœ and 

 more often in the latter, there may appear larvrE, very délicate 

 in the skin texture, which would pass as small examples of 

 denhami. In fact, there are no points of distinction except the 

 greater tendency in the last, for the earlier portion of the spira- 

 cular stripe to be orange instead of yellow. The larva, on the 

 whole, varies but little. There is never produced a form similar 

 to the pale creamy yellow forms of heienœ with the suppressed 

 markings and coarse skin. As a matter of fact, the variation is 

 ail toward a darkening of the ground colour, accompanied by 

 a tendency for the suffusions, but not the stripes, to bc weak. Tn 

 rare instances, the underside becomes very much like that of 

 heienœ, both in coloration and in the sape of the stripes. This is 

 one of the few points in which the larva varies toward heienœ. 



Habits of larvae. 



What has been said about heienœ larvae, will serve for this 

 also. It must be noted, however, that in the earlier instars, when 

 once settled to its food, it displays much less inclination to leave 

 it. Perhaps on the whole, it does not feed so ravenously and 

 therefore, takes slightly longer to feed up, 



