74 THE CANADIAN ENTOMOLOGIST. 



observation. The differences in the larva, to be presently referred to. 

 will, we think, excuse us for regarding the species, at least for the present, 

 as distinct. All the specimens referred to, including an example of the 

 larva preserved in alcohol, have been submitted to Mr. Grote, who thinks 

 the species are probably distinct. . 



Larva of Catocala polygama found feeding on thorn about the middle 

 of June. Length about one and three-quarter inches. Head flat, sprinkled 

 with fine brownish hairs ; bilobed, each lobe tipped with whitish ; color 

 ashy grey with a wide black band above extending obliquely down the 

 sides, in which are several dull faint reddish streaks. 



Body above greenish grey, clotted with very minute blackish dots ; on 

 the anterior portion of second and third segments there are a few whitish 

 dots, each emitting a single hair ; a broken dorsal stripe of a paler hue 

 imperfectly margined with black, the stripe becoming whiter on hinder 

 portion of fifth, sixth, seventh, eighth and tenth segments. On fifth and 

 sixth segments are two whitish patches similar in form, almost pointed 

 anteriorly, posteriorly enlarging with the hinder edge concave, thus giving 

 the widened portion a bilobed appearance ; posterior portion of fifth 

 segment rather darker than general color, with a slight purplish tint ; 

 hinder portion of ninth segment slightly raised and of a deeper color, the 

 dark patch covering the anterior portion of tenth segment and extending 

 down the sides close to under surface. Posterior portion of twelfth seg- 

 ment slightly raised and margined behind with black, the same color 

 extending obliquely down the sides towards the front. On each segment 

 there is a small tubercle on each side the dorsal line, of a greyish hue, 

 but so small as to be scarcely visible, excepting those on twelfth segment, 

 which are somewhat larger. Terminal segment flattened and spreading, 

 with a few whitish dots on its hinder portion and two reddish brown 

 tubercles on anterior portion. Lateral fringe close to under surface of a 

 delicate pinkish tint ; spiracles blackish. 



Under surface whitish green with a tinge of blue, with a central row 

 of blackish spots larger and deeper in color along the middle, smaller 

 and paler towards each end. Feet and prolegs greenish, dotted and 

 streaked with brown or brownish black. 



Var. A. — Rather paler in color, dark patch on ninth and tenth seg- 

 ments and whitish patches on fifth and sixth segments less prominent, 

 dark patch on fifth segment almost wanting; small tubercles on each side 

 the dorsal line more apparent ; spiracles brownish, faintly edged with 

 white. 



