no. i. BOMBYCINE MOTHS OF NOETH AMERICA— PACKARD. 273 



and the region around their base is black. The clypeus-posterior is black with two yellow 

 spots in the center. The labrum and the region on each side is black. The head is fully as 

 wide as the body. 



First thoracic segment straw-yellow, with four dorsal black spots whitish in the middle 

 above; two black spots on each side. On the second thoracic segment are two larger black 

 spots, and two larger ones on the third segment. On each of abdominal segments 1-7 are 

 five black dorsal spots, the black bands now being divided into spots; on segments 8 and 9 

 two dorsal black spots, and the front edge is black. The eighth segment is orange-reddish, 

 becoming deeper on the sides. The sides of the abdominal segments below the spiracles are 

 orange-ochre, on the thoracic segments the corresponding region is yellowish. On the ninth 

 segment are two dorsal black spots, and on the front edge five black spots. 



Suranal plate pale straw-yellow, black at the end* there are two small black dots on the 

 front edge. Each abdominal segment with eight black spots on each side of the median spot, 

 making seventeen spots in all. 



Anal legs white, with five black unequal vertical stripes, the edge of each stripe black all 

 around. Midabdominal legs dark brown, with a black ring at base, and another just above the 

 planta. 



The skin is provided with very fine short scattered dark hairs, those on the midabdominal 

 legs much longer than those on the body. 



Stage III: Length 17-27 mm. Width of head 2f mm. The head is mostly black, but 

 with white lines so disposed as to break it up into five irregular black lines or spots on a side; 

 the two on the vertex, one on each side of the median line or suture of the head, above the 

 apex of the clypeus, each forming a short curved band; the two lowest black spots down on 

 the side near the ocelli are triangular. Clypeus black, the head being white on each side next 

 to it. The anterior division of the clypeus is white, as also the base of the antennae. Toward 

 the end of the stage the white lines of the head become wider, so that the black areas are some- 

 what reduced in size. 



The body is pearly white, with a larger portion white, the black spots being smaller and 

 more numerous than in stage II. 



Prothoracic segment with only two dorsal spots instead of the four black spots of stage II, 

 the two dorsal ones conspicuous and elongated, diverging from each other. 



The second and third thoracic and eighth abdominal segments, and the suranal plate at 

 the base of the two horns, are now distinctly enlarged or swollen, remaining so through stage 

 IV, when they are more conspicuously inflated, much as in Arsenura xanthopus as figured by 

 Peters. All the horns are much as in stage II, being swollen where a seta is given off, and 

 more or less crumpled, kinky, or twisted. Length of thoracic horns 10 mm., being fully one- 

 half as long as the entire body; length of caudal horn 6 mm.; of the two suranal horns 3£ mm. 



The black patches more numerous and smaller; those on the tergum are now broken up 

 into separate spots. There are now on each abdominal segment 1-7 three rows of lateral black 

 spots, and a conical one just behind the middle of each segment, or seventeen spots on each 

 segment. Of these three rows the lowest one is the spiracular one, the black spiracle being 

 situated in the center of the middle one of the three spots forming the line. 



On the eighth abdominal segment are four black spots on each side, one inclosing the 

 spiracle, and a median one behind the caudal horn. On the ninth segment are six black spots 

 on each side and one in the middle, or thirteen in all. On the front edge of the second and 

 third thoracic segments are two black spots. 



The suranal plate is smooth, white, unarmed, no setae, only the two black horns; the 

 end of the plate is black. 



There is a group of about a dozen minute short fine setae on each side of the tergum of 

 abdominal segments 1-7, marking the probable site of tubercles in the ancestors of the group. 



Above each midabdominal leg is a black spot, while the legs themselves are blackish at 

 base and near the planta, the basal spot inclosing a white patch; the hinder part of the leg is 

 83570°— 14 18 



