352 



PSYCHE. 



[June 1890. 



piliferous warts, tliere being three warts 

 on each seo^ment ; those of the upper- 

 most row (each situated behind a spir- 

 acle) are the largest and arranged ob- 

 liquely ; those of the middle row are 

 crescent-shaped ; while those of the 

 third row are minute and situated at the 

 base of the legs, or in corresponding 

 places on the apodal segments. It is to 

 be observed that the arrangement of 

 the warts on the 8th segment is exactly 

 the same as on the seven segments in 

 fro7it of it. On the 9th segment there 

 are two large subdorsal groups of three 

 coalesced segments, the area either one 

 of them occupies being the same as that 

 covered by one of the double warts on 

 the 2d or 3d thoracic segments. The 

 suranal plate is roughened with crowded 

 warts. The body is pale Vandyke 

 brown, the warts darker. The hairs 

 are nearly twice as long as the body is 

 thick, being long and sparse. 



Stage II. — Length 4-5 mm. The 

 head is a little smaller than before, but 

 the body is of the same shape ; the 

 warts on the prothoracic shield are less 

 pronounced, and the warts on the rest 

 of the body preserve the same arrange- 

 ment as before, but are decidedly small- 

 er. The body is slightly more reddish 

 in tint. 



Stage III. — Length 7 mm. The 

 head is now slightly narrower in pro- 

 portion to the width of the body than 

 before. There is now a great change 

 in the nature of the piliferous warts, 

 and a marked increase in the number 

 of hairs. The prothoracic shield shows 

 a tendency to divide into halves. The 



primary piliferous warts have under- 

 gone a differentiation so that the sur- 

 face has become covered with small 

 secondary piliferous warts each l:)earing 

 a hair one-half shorter than those of the 

 preceding stages, so that the longest 

 ones are about as long as the body is 

 thick ; the hairs are thus arranged in 

 thin tufts or verticils. The two com- 

 pound warts on the 9th abdominal seg- 

 ment are larger than before. The arc- 

 tian features thus seem to be assumed 

 in the third stage. 



Stage IV. — Length 10- 11 mm. The 

 head is slightly smaller in proportion 

 than before and now differs much in 

 mode of coloration ; there is a medi- 

 an pale stripe from the the vertex to the 

 front ; the clypeus being pale, and con- 

 necting with a broad lateral pale band. 



The prothoracic shield is now com- 

 pletely divided by a median line. The 

 piliferous warts are somewhat smaller 

 than before, but the hairs are of the 

 same length. The position of the dor- 

 sal warts on the 2d and 3d thoracic 

 segments have somewhat changed their 

 position besides being smaller. They 

 are arranged in a slightly curved line 

 across the segment. The four dorsal 

 ones on abdominal segments i-S are 

 arranged more in a trapezoid than be- 

 fore. The two dorsal warts on the 9th 

 segment are now about half as large as 

 in the preceding stage. The general 

 color of the body is more reddish than 

 before, with a slight chestnut tint. 



Stage V. — Length 15-16 mm. 

 (Evidently underfed.) The head is 

 marked as before, but the body is 



