THE CANADIAN ENTOMOLOGIST. 73 



about one-tenth of an inch long, slightly curved backwards, of a dull 

 dark reddish color, thickly dotted with black about the base. The usual 

 dark patch on ninth and tenth segments is wanting, excepting close to 

 under surface, where it is faintly visible. Twelfth segment scarcely raised, 

 with no black streak behind, but having a faint line formed by a row of 

 black dots extending obliquely down the sides towards the front. Ter- 

 minal segment flattened ; lateral fringe of a decided rosy pink hue : 

 spiracles whitish encircled with black. 



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

 of brownish black spots larger and deeper in color on seventh and eighth 

 segments, decidedly paler on second, third and fourth, and of a reddish 

 brown on segments from ninth to thirteenth inclusive. Feet pale green- 

 ish, faintly marked with brown ; prolegs bluish green, hinder three pairs 

 streaked and dotted with black. 



Occasionally specimens not full grown have been met with of a darker 

 shade, arising from their being more thickly dotted with black; in these 

 the tubercles have been less decidedly red, while the fleshy horn 

 approached the general color, but was thickly covered with blackish dots. 



The moths produced from this larva very much resemble polygama, 

 but are smaller. The brown rilling of the subterminal space is obsolete 

 or very pale ; the transverse posterior line has the lower tooth very small, 

 while the line itself is narrow ; in polygama the teeth are sub-equal ; the 

 sub-costal angulation of the line is also less pronounced and the sub" 

 reniform is connected with and very near the transverse posterior line. 

 In 25 specimens of polygama the sub-reniform is connected with the 

 transverse posterior line only in a single specimen. The transverse 

 posterior line between the lower discal tooth and vein 2, where it joins 

 the sub-reniform, is more directly oblique and even ; in polygama this 

 line, though sometimes uneven, seems to form a regular curve. The 

 transverse anterior line appears to be more regularly arcuate. The hind 

 wings and under surface are almost identical with polygama. From both 

 sexes carefully examined we are unable to give any further points of 

 difference. 



We would here remark that in six additional specimens of polygama 

 the lower tooth of the t. p. line is smaller than the upper. Possibly none 

 of the points of difference urged are in themselves invariable, nor per- 

 haps such as would suggest the separation of the species ; at the same 

 time, it is possible that some essential differences may have escaped our 



