74 INDEX TO MISSOURI ENTOMOLOGICAL REPORTS. 



ent in the iinago, yet closely resembles populi in the larva state. I have on two occa- 

 sions found the larva of Americana feeding on the Soft Maple, and it may be distin- 

 guished from popidi, by its greater size; by the paler color of the body; by the hairs 

 being paler, more numerous, shorter and pointing in all directions, especially ante- 

 riorly and posteriorly of each segment ; by having on each of joints 4 and 6 two dis- 

 tinct long black pencils, one originating each side of dorsum, and on joints 11 one 

 thicker one originating from the top of dorsuin ; by a substigmatal row of small black 

 spots (three to each segment, the middle one lower than the others) and'by a trape- 

 zoidal velvety black patch starting from anterior portion of joint 11 and widening to 

 anus. [Second Kept., pp. 120,121. Figs. 87,88. 



Grote refers it, in his List, to lepusculina Gn. ; having, I believe, seen 

 the type. Guenee must have had a uniformly colored and pale speci- 

 men as my typical specimens have a distinct orbicular mark, deeper 

 subterminal markings and the terminal space contrasting by its darker 

 gray with the rest of primaries all unmentioned in Guenee's descrip- 

 tion. 



XYLIXA CIXEUEA, N. Sp. Larva Length when full grown 1.20 1.30 inches 

 [=30 32 mm ], color shiny silvery-green on the back, darker below. A medio-dorsal 

 cream-colored stripe ; a subdorsal one represented by 3 or 4 irregularly shaped spots 

 on each joint. A broad deep cream-colored stigmatal line, with a few green dents in 

 it, extending to anal prolegs. Four slightly elevated cream-colored spots, encircled 

 by a ring of rather darker green than the body, in the dorsal space, and in the sub- 

 dorsal space there are four or more similar but smaller spots. Venter glaucous-gray. 

 Head as large as joint 1, free, glassy-green with white mottlings at sides and top, and 

 pearly- white lips. Thoracic legs Avhitish. Prolegs coucolorous with venter. When 

 young the body is darker and the markings paler. Described from two living speci- 

 mens. 



Imago (Fig. 57, l>)^Front icings, with the ground-color pale cinereous shaded and 

 marked either with light brown, having a faint purplish tint, or with darker brown, 

 having a similar reflection, or with a colder grayish-brown with the faintest moss- 

 green reflection : in the first two cases the dark color either blends and suffuses with 

 the ground-color so as to give the wing a nearly uniform and smooth appearance, or 

 else contrasts sufficiently to bring out all the marks distinct ; in the latter case (two 

 specimens) the markings are very distinct and the ground color is whiter and more 

 irrorate. In the well-marked specimens the usual lines are readily distinguished, the 

 basal half line, transverse anterior and transverse posterior being quite wavy, pale, 

 and bordered each side with a dark shade, the median shade dark and well defined 

 and the subterminal line, though sometimes pale near costa, forming a series of dark 

 angular spots : in the more uniform specimens these lines are barely distinguishable 

 and perhaps the most constant is the sub-terminal which most often takes the form of 

 a series of -dark angular spots : the ordinary spots Iiav<- a pale inner and a more or less 

 distinct dark outer aunulation ; the orbicular is larger than the reniform and is suffi- 

 ciently double to take on the form of an 8, the upper part of which is always largest 

 and with the interior space paler than the general surface, while that of the lower 

 part is either coucolorous or darker ; the form is, however, quite irregular and differs 

 sometimes in the two wings of the same species: the reniform spot is generally well 

 defined, a"nd is either darker, or has a tinge of reddish -brown, interiorly: at the base 

 of the wing is a more or less distinct pale space occupying the upper half, and bor- 

 dered below by a brown line which is straight about half it> length and then extends 

 upwards ^ind outwards towards transverse anterior. A tolerably distinct terminal 

 line, with the fringes dark. lu taking a general view of the varying specimens this 

 pale basal space, the pale upper part of the orbicular and the dark subterminal line, 

 seem to be the most constant characters of the species. Hind winy* gray-brown in- 



