76 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



In one male, body and wings are darker than in the two others, more umber or vandyke 

 brown, and the four (only) spots on fore wing tend to become obsolete, smaller and almost 

 wholly opaque with brown scales. 



(In brachyura the spots vary in size, in one <? on fore wing they are one-half as large as 

 in another <f and opaque, with a minute central clear dot.) 



Geographical distribution. — Sierra Leone, Africa. (D. Cator.) 



Larva. — The last stage. Body rather thick, not tapering behind, cylindrical. Head 

 rather large, not much narrower than the prothoracic segment and slightly more than half 

 as wide as the body in its thickest part; surface of the head with groups of microscopic granu- 

 lations, about four to eight in a group, except on the clypeal region and near the eyes, where 

 the surface is smooth. The body heavily armed with six rows of large stiff spinulated tubercles. 

 On the three thoracic segments an additional row on each side. On the prothoracic plate the 

 four dorsal tubercles are shorter than the others, and the two on each side of the median line 

 are close together. The inner two on each side of the median line of the body form two stout 

 acute diverging spike-like spines, with five or six smaller ones around the base; those of the 

 outer row are composed of four larger radiating spines, with four to five smaller setiferous ones 

 around the base. On each side of these two sets of tubercles are the two lateral spines, one 

 supraspiracular, the other infraspiracular; the former is large, thick, and high, fleshy at the base, 

 and bearing above about a dozen stout acute spines, the smaller ones ending in a stiff seta. 



The second and third and the abdominal segments heavily armed with stout spiniferous 

 tubercles, which are fleshy at base, and chitinized toward the end. The two rows of dorsal 

 ones on the second and third thoracic segments and the median tubercle on the eighth abdominal 

 segment are distinctly larger than the other abdominal ones and dark in color, while the abdom- 

 inal tubercles (four dorsal rows) are pale (in alcoholic specimens). 



They are clavate, enlarging a little at the end, and terminating in two diverging, large, stout, 

 spike-like spines, while the shaft of the tubercle bears from about 8 to 10 smaller spines, varying 

 in size, one or two of them nearly as large as the two uppermost ones. All of the spines, both 

 of the dorsal and lateral rows, are of the same general shape, those on the sides but little smaller, 

 and those on the back of the abdominal segments a little smaller than the thoracic ones, and 

 slightly longer than those on the sides of the same segment. 



The median tubercle on the eighth abdominal segment is somewhat larger than the one 

 on each side of it, and shows its double origin by the evident fusion of two primitively separate 

 ones, by its greater thickness, width and the bilateral arrangement of the spines; of the four 

 uppermost and larger ones, two on each side diverge from the two on the other side. 



There are six tubercles on the ninth abdominal segment, the lowest one on the side of the 

 segment forming a single curved spine, ending in a stout seta. 



Suranal plate (tenth abdominal segment) large, broad and rounded behind, the surface 

 granulated, the edge much thickened, and on the extreme hinder edge armed with several 

 minute setiferous spines on each side. Beyond the middle of the plate on each side, at the 

 edge, is a large stout spinulated tubercle as thick as, but not quite so long as the supraspiracular 

 one on the ninth abdominal segment; it is armed with about eight large unequal acute stout 

 spines, and numerous smaller setiferous ones. The two large erect spines are one of the diagnos- 

 tic features of the group. 



Anal legs large, sub triangular, the surface sparsely pitted and finely granulated; the 

 hinder edge finely spinulated, the spinules ending each in a seta. 



In the. alcoholic example the head is colored chestnut brown. On the sides of the body 

 is an irregular network of dark blotches, sending irregular lines or blotches up on each side of 

 the spinules. The thoracic legs are pale reddish chestnut; the abdominal legs pale, with a 

 chitinous dusky spot on the outside near the middle of the leg. 



Length 35 mm. 



Pupa. — <? . A very singluar pupa, nothing like it occurring, so far as we know, in any of 

 of the Saturnian or protosphingoid families, or indeed in any other Lepidoptera. 



Body somewhat flattened from above downward, the head and end of the abdomen being 

 inclined downward. 



