256 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xh, 



smaller than those on the thoracic segments, nor do they" differ in height or size among them- 

 selves, except the median tubercle on the eighth abdominal segment, which is quite broad and 

 one-fourth larger and higher than the others, and about twice as wide as the others; there are 

 six to seven setae on each side. Those on the sides of all the segments are of the same size. 



The dorsal tubercles are each armed with eight stiff setae, which are pale brown, the longer 

 ones of which are about a third longer than the tubercle itself, one being ha the center and the 

 others arranged around it. 



On May 17, after being forced by a sojourn in the kitchen, it was ready to molt; its length 

 was 13 mm. The body had now become livid greenish-yellow; the tubercles all straw-yellow, 

 and of the same proportions. The spiracles are dark, rather conspicuous. There is a transverse 

 blackish line on the prothorax behind the four tubercles. 



Stage III: It molted May 18, and was described on the 19th. Length 20 mm. Head 

 yellow, black behind, with a broad V in front connecting with the black base of the clypeus- 

 anterior. Body thick, head only one-half as wide as the body in the middle. First thoracic 

 considerably narrower than the second thoracic segment. The tubercles are still all similar, 

 of the same size and color. The two dorsal ones on each side of the prothoracic shield still 

 united. The median dorsal tubercle on the eighth abdominal segment is nearly twice as thick 

 and somewhat higher than those on each side. Each dorsal tubercle bears eight or nine setae, 

 while on each infraspiracular tubercle are from eight to twelve setae or spinules. 



The body is now black, the sutures between the segments white; the hinder edge of each 

 segment, beginning with the second thoracic, also white. Suranal plate straw-yellow with an 

 irregular longitudinal band, widening behind the two tubercles. The tubercles orange-yellow, 

 straw-yellow at base. Anal legs entirely black. Thoracic legs and antennas pale at the end; 

 abdominal legs all black. Spiracles black, surrounded by black. It molted May 22-23. 



Stage IV: Length 23 mm.; at end of the stage 35 mm. The body is now thick and 

 stout, leaf-green. The head is pale straw-yellow, black behind, inclosing a distinct oblong 

 black spot; clypeus broadly edged with black, making a V. Antennae and clypeus-anterior 

 whitish. 



The dorsal tubercles are all of the same size, and of the same orange color. The spines 

 on those of the three thoracic and first abdominal segments somewhat dusky; those on the 

 tubercles of the segments behind are all pale, while those on the infraspiracular tubercles are 

 a little dusky, as also those of the two dorsal tubercles on the suranal plate. The plate is rather 

 smooth, pale straw-yellow, and bearing along and just outside of the edge a hollow triangular 

 black mark with the corners well rounded. Anal legs green, with a similar but larger hollow 

 black subtriangular ring; the legs below and all the abdominal legs are black with a green spot 

 on the outside of the middle, and bearing long white hairs of even length. 



At the end of this stage, May 28-29, it was 35 mm. in length. Now the tubercles are 

 all deep reddish from the top to the base, greatly contrasting with the deep green of the body. 

 The lower edge of the ninth and tenth abdominal segments are now white, forming a broad 

 line. 



The front edge of abdominal segments 3-7 whitish. The green spot on the outside of the 

 midabdominal legs is now yellow. 



For a day after molting it nibbled its cast skin. 



It molted for the fourth time about June 1, and was described June 3. 



Stage V: Length 48-50 mm. Head and body deep pea-green, the head green, with two 

 black lines behind, while the clypeus is lined with black. The head is still small hi proportion 

 to the body, being about one-third the width of the latter, and only two-thirds as wide as the 

 prothoracic segment. The prothoracic shield is now smooth, with four median minute groups 

 of four to five minute short setae, and two rounded lateral small tubercles. The tubercles of 

 the second, thoracic segment are smaller than those on the third, the. latter not being so high and promi- 

 nent as those on the first abdominal segment; those on the thoracic segments are flattened, 

 buttonlike, not so high as thick; all orange-yellow, and bearing from four to seven short black 

 stout setae, the longest ones no longer than the tubercle is high. 



