﻿OF THE STATE ENTOMOLOGIST. 129 



JQlinoif!, [very questionable], Iowa, Missouri, Nebraska, Kansas, Colorado, Wyo- 

 ming, Utah, Idaho, Nevada, Montana, Minnesota, and Dakota. (Thomas, by examina- 

 tion and collections in person); Minnesota, Wisconsin [doubtful], Dakota (Scudder) ; 

 Texas, Arizona, British America (Thomas)— [Thomas, Acrididce of N. A., pp. 164-5. 



Kegarding coloration, as \,'ii\\ femur-rubrum, it is quite variable, and the dead speci- 

 mens convey a very imperfect idea of the living colors, which are thus given in my 

 notes taken in the field. The more common specimens are yellowish-whiie beneath ; 

 glaucous across the breast and about mouth-parts ; pale bluish-glaucous— often with 

 shades of purple— on the sides of the head and thorax and on the front of the face ; 

 olive-brown on the top of head and thorax ; pale beneath, more or less bluish above 

 and marked with black, especially towards base, on the abdomen. The front wings 

 have the ground-color pale grayish-yellow, inclining to green, and their spots and veins 

 brown; the hind wings, except a yellowish or brownish shade at apex and along the 

 front edge and a green tint at base, are transparent and colorless, with the veins brown. 

 The front and middle legs are yellowish. The hind legs have tlie thighs striped with 

 pale glaucous and reddish on the outside and upper half of inside, with four broad 

 black or dusky marks on the upper edge, the terminal one extending beneath around 

 the knee. The shanks are coral-red with black spines ; the feet somewhat paler, witli 

 black claws ; antennaj pale yellow ; palpi tipped with black. In the dead specimens all 

 these colors become more dingy and yellow. Palpi and front legs in some specimens 

 tinged with red or blue ; the hind tibiae sometimes yellowish instead of red, especially 

 in the middle. 



Larva— When newly hatched, the larva is of a uniform pale gray without distinc- 

 tive marks. It soon becomes mottled with the characteristic marks however. After 

 the first molt the hind thighs are conspicuously marked on the upper outside with a 

 longitudinal black line ; the thorax is dark with the median dorsal carina and two dis- 

 tinct lateral stripes pale yellow, the black extending on the head behind the eyes. The 

 sides of the thorax then become more yellow with each molt, the black on the hind 

 thighs less pronounced, and the face at first black and then spotted. The occiput and 

 abdomen above are mottled with brown, the former marked Avith a fine median, and 

 two broader anteriorly converging pale lines, the latter with two rather brolien lateral 

 lines of the same color. 



PwjDa— The pupa is characterized by its paler, more yellow color, bringing more 

 strongly into relief the black on the upper part of the thorax and behind the eyes ; by 

 the spotted nature of the face, especially along the ridges, by the isolation of the black 

 subdorsal mark on the two anterior lobes of prothorax, and by the large size of the 

 wing-pads, which— visible from the first molt and increasing with each subsequent 

 molt— are now dark, with a distinct pale discal spot, and pale veins and borders. The 

 hind shanks incline to bluish rather than red as in the mature insect. 



In the following table of measurements, introduced for comparison with that given 

 of femur-rubrum, the same rules were adopted as in the other case, and particular pains 

 were taken to get specimens from as many parts of the ravaged country as possible ; 

 also, by study of the structural and other peculiarities of spretus to guard against the 

 chance mixing of specimens of femur-rubrwn. 



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