ENTOMOLOGICAL CONTRIBUTIONS. 



about three-fourths its length, is a short delicate hair, proceeding from 

 a minute granulation on the fourth annulet, and directed downward ; 

 beneath the stigma, at a distance of about its length, are two similar 

 hairs directed backward, proceeding from the summit of a slightly 

 larger granulation. 



On the morning of the 12th of July, quite unexpectedly, it was 

 found that six of the larvje had left the willows, had undergone a 

 change of color to a sordid apple-green, and were endeavoring to 

 escape from confinement, thereby indicating their having attained 

 maturity, and a readiness for their pupal change. It was the first 

 instance which had come under my observation of pupation in the 

 sphingidae preceded by only three moltings. That the three above 

 noted, were all that these larrse had undergone, was beyond all 

 donbt, not alone from the careful observations made, but each cast 

 head-case had been carefully preserved, and of these there were but 

 the three sets. 



Mature larva. Length at rest, one inch and nine-tenths to two 

 inches. Color pale green, whitish dorsally. Flead triangular, the 

 apex not rising above the first segment, granulated in pale green 

 anteriorly and in white laterally: the lateral stripes yellow, having 

 within them a row of larger granulations increasing in size to the apex, 

 where the two superior ones are papilliform and of an orange color. 

 Body moderately tapering in the anterior segments : the seven lateral 

 bands pale yellow, except the posterior one which is bright yellow, 

 the anterior one obsolete ; their extent, two-eighths to three-eighths, 

 the whole, and from five-eighths to seven-eighths, respectively, of three 

 segments : thoracic stripe with pearl white papillae larger than those in 

 the bands, commencing on the superior portion of the first segment, 

 and merged into the first lateral band on the fourth segment at its 

 seventh annulet, midway between the stigmata and the vascular line. 

 Anal shield and plates granulated, of a darker green concolorous 

 with the ventral region. Caudal horn straight, sometimes slightly 

 curved, granulated, violet, with fuscous acute granulations at its tip 

 occasionally. Stigmata elliptical, red, except the first which is 

 orange. Legs roseate interiorly, fuscous exteriorly ; prolegs green. 



Pupation. On the evening of the 12th, the above larvae were 

 placed, for their pupation, in a 9 x 15 box, containing five inches of 

 earth mixed with one-third part of hard wood sawdust, and moistened 

 to a packing consistency. Showing a disposition to travel over 

 the surface of the ground, holes were made with the finger in which 



