MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 121 



enonaouKly J<>n<i kikI i\-rij ■•<1eii<l<')\ beint;- about half a^ long as the body. They are deeply forked. 

 each fork long and slendei-, and bearing- a long t)ristle. The tubercles on abdominal segments 

 1-7 are small and short, of nearly equal length, simple except those of the inf raspiraeular row, 

 which are deeply forked. The single median tubercle ou the eighth abdominal segment is 

 remarkably long and slender, about two-thirds as long as the thoracic ones. There is also a single 

 'median forked tuhercJe on tin- nintli segment; not half as long, however, as the one directly in 

 front. Thesuranal ]>i'itrl„,irx at the end two long fve-hranched piliferoiis tubercles. All the 

 tubercles are of nearly the same color as the body: the live longest ones, however, a little 

 brownish near and at the end. 



The four middle pairs of abdominal legs are shining black ext(Miially on the outer half : other- 

 wise they are concolorous with the body. 



The following description is drawn up from some larva* at the end of stage I, living October 

 9 or 10 and reared by Mr. Bridgham; they were about 7 mm. in length, and had been kept for a 

 number of days, and died before molting. The head js large, full and rounded, smooth and 

 shining honey-yellow; nearly twice as wide as the body (actual width. 1..5 mm.), rounded above 

 on the apex; the eyes and mouth parts black; labrum whitish. The body is ocherous. The 

 prothoracic segment is very broad and flaring in front, nearly as wide as the head, bearing ten 

 black spines, of which the two dorsal ones are .about as long as the body is thick, each bearing 

 three or four small, short tubercles, and ending in a long fork, each branch bearing a long seta, 

 which is white at the base. The subdorsal spines are a little less than half as long and large as 

 the dorsal ones. The dorsal second and third thoracic horns are \ery long and large, being 

 nearly twice as long as the middle of the body is thick; the stalks are knotted (not tuberculated) 

 and deeply forked at the end; each fork thick and ending in a seta. Those on the third segment 

 are slightly shorter, with a smaller fork than the two on the second thoracic segment. Each 

 abdominal segment is provided with six black spines; the two dorsal ones about half as long as 

 the body is thick, with two or three minute warts; they are forked at the end. the lower fork 

 small, about as long as the spine is thick, and not bearing a seta, while the other fork or tine is 

 directed obliquely upward. 



The spines of the next row outside (subdorsal) are small and ^iini)le. while the lateral row near 

 the base of the legs is composed of branched spines nearly as large as the dorsal ones, and with 

 each branch ending in a long seta. The caudal spine on the eighth alxlominal segment is nearly 

 as large as those on the second and third thoracic segments, but with a smaller fork, each ending 

 in a seta. There is a median dorsal spine on the ninth segment, about one-half as long and large 

 as that on the eighth, with three branches, the two terminal forming an uneven fork. There is 

 no distinct suranal plate, only a suljtriangular flattened area bearing along the edge six black spines 

 of very unequal size. Around abdominal segments 1-7 is a double, black band, and the lateral 

 and subdorsal spines on these segments are connected by a black liand, also inclosing the spiracles, 

 these short bands alternating with long bands passing o\cr the body. The thoracic legs are 

 black; the abdominal legs dull ocherous, with a large, black i)at(li co\cring the outside. The 

 anal legs are rather large and square, ocherous, the hinder edge pitchy red. 



It mav be observed that the median dorsal spines on the eighth and ninth abdominal seg- 

 ments are forked like those of Ilyperchiria i<>. 



Stage //.—July 10, 11. Length, 13-15 mm. Tlie head i> a> wide as the thoracic segments 

 (exact width, 2 mm.); it is chestnut brown, a little darker on the sides above the eyes and on the 

 clypeal region. The spines on the prothoracic segment are nuich as before, hut .stouter and 

 shorter. The dorsal spines on the second and third thoracic segments are nuich as before, hut not 

 quite so deeply feirh'd ; they are dusky amber wax at the base, and black lieyond; they are irregu- 

 larly spino,se from base to tip; each fork bears a white hair. Alt t],. .4],, r xpines are hlacl. The 

 "caudal horn" on eighth abdominal segment is stouter at l)ase. the trunk with larger, longer, and 

 more numerous spinules, which end in a bristle which is not jjresent in stage I: it is still evenly 

 forked. 



