Packard.] 1K)0 [March 17, 



lengll), which at first I thought must belong to a fourth stage, or at least 

 one before the lust, but as the head is of nearly tlie same size as full- 

 grown specimens, I am inclined to regard it as simply a belated individual, 

 or one which had recently moiled, and luid not fed up so as t j till out to 

 its full size. 



Length of body, 45-50 mm.; breadth of the head, 6.5 mm. The head 

 is yellowish brown, with a dark spot on each side of the head opposite 

 the apex of the clypeus. The two dorsal prothoracic spines are nearly aa 

 long as the head is wide, but without the long slender spinules of the 

 previous stage ; they are yellowish, but black on the distal third ; the 

 third or metathoracic pair are a third longer than the body is thick, and 

 like the others, with short, stout spinules. The abdominal spines are now 

 much shorter than before, with short spinules, though slightly longer 

 than in the fully grown examples. The " caudal spine" on the eighth 

 abdominal segment is as in the full-sized specimens. The general hue of 

 the body is as in the full-grown larva, but the thoracic dorsal black spots 

 are smaller, though the metathoracic segment in front of the horns is 

 deeply stained with black. 



Full-grown Larva. — Length, 125 mm. ; thickness of the body, 20 mm. ; 

 width of head, 7 mm. The head is about one-third as wide as the body 

 rounded, smooth, free from liairs, and yellowish, not spotted on the 

 sides, and not banded as in Eacles imperialis. The body is cylindrical ; 

 the skin smooth and shining, not granulated, as in Sphingicampa and 

 Eacles. The two middle prothoracic spines are large and long, being 

 nearly as long as the head is wide, but the spinules, like those of the other 

 "horns," are now short, thick and acute, not long and slender as in the 

 previous stages ; length, 6 mm. ; they are yellowish and black on the 

 outer third. This and each segment of the body succeeding have six 

 well-developed spines, except the eighth and ninth abdominal, which 

 have each an addiMonal spine, the large median one. The two large 

 median horns on the two hinder thoracic segments are each about 20 mm. 

 in length ; the horns of the second row corresponding to the subdorsal 

 or supraspiracular row of the abdominal segments, being about half as 

 long (10 mm.) as the dorsal ones ; they are also yellowish and blackish 

 on the outer third. All the six abdominal spines of segments 1-7 are now 

 very small, slender and only about twice as long as the large dorsal 

 horns are thick at the base ; viz., 4 mm. in length. Unlike the full-grown 

 Eacles, the supra and infraspiracular spines are as well developed as the 

 dorsal ones. On the eighth and ninth abdominal segments the "caudal 

 horns" are supplemented by two small, slender spines, situated just 

 behind the large median horn. Whether these have any morphological 

 significance is doubtful ; they do not exist in Eacles. Length of the 

 "caudal horn " on the eighth segment, 9 mm. ; that on the ninth segment 

 being one-half as long. The suranal plate is triangular, the surface rough, 

 with two small tubercles on each side, but no spines. The anal legs 

 are very large, subtriangular, with the outer surface rough, and on the 



