307 



diameter at its base. It has a few hairs on its surface, and is almost 

 entirely retractile. The body is cylindrical, somewhat depressed, or 

 rather laterally expanded, whey-colored, with the appearance, even to 

 the naked eye, of irregular patches of small, round, white eggs over 

 nearly one-half its surface, except on the first, second, and partially on 

 the third, segment. The external integument, between most of the 

 middle segments, is retractile, and furnished below with tubercles (pseu- 

 dopods), which entirely disappear at the will of the animal. Segments 

 three to one are tapered gradually, so as to leave no shoulder at the 

 head, and segment twelve is tapered suddenly to an obtuse point when 

 viewed from above, but when viewed in profile there is a large, 

 triangular prominence on its entire inferior edge. On each side of 

 segment eleven above there is a large brown spiracle — on the other 

 segments none. The larva of the d was much smaller, and varied 

 only in entirely wanting the appearance of masses of eggs on its sur- 

 face. Described from the living specimens. One d' ; one (sup- 

 posed) ?. 



The pupa of the supposed 9 (described from the pupal integument) 

 is cylindrical, a little stouter on the thorax, suddenly rounded off before, 

 and gradually and slightly tapered on the last two or three segments. The 

 general color is a dark chestnut-brown. On each side of the head and 

 above the mouth, which is inferior, is a very large, obliquely-elongate 

 tubercle, sloping towards the occiput, and representing, perhaps, the 

 antennse. On the extreme occipital end of this tubercle, and also 

 near the other end, is a long, slenderish, acute thorn tipped with black. 

 The pronotum, which bears a dorsal pair of flattish, round, and not very 

 obvious spiracles a little behind the anterior margin, is armed on the 

 middle of its lateral dorsum with a still longer slenderish, acute thorn, 

 about .08 inch long, directed outwards and upwards, curved slightly 

 backwards, and tipped with black. The mesonotum is two and one- 

 half times as long as the pronotum, has a small, robust thorn on the 

 . middle of the oi-igin of the wing-case, and on its humerus, close to the 

 suture, bears a spiracle in the form of a round tubercle, termi- 

 nating in a nipple-like, obliquely-arranged double tubercle. Behind 

 the mesonotum is a short metanotal piece, scarcely half as wide as the 

 pronotum, which is succeeded by eight subequal segments, all but the 

 last bearing a lateral dorsal spiracle, similar to that of the mesonotum, 

 except that the crowning double tubercle is transversely arranged. 

 The first of these segments* is armed on the anterior edge of the whole 



* I believe this first spiracle-bearing segment to be metanotal, and to be homol- 

 ogous with the non-spiracle-bearing piece, which follows the piece bearing the hind 

 wings and precedes the spiracle-bearing abdominal joints, in the pupa of Sphingi- 

 campa and all other Lepidopterous pup» known to me In the Lepidopterous pupa , 

 as in the larva, neither meso - nor meta-thorax bears any spiracle ; in these tw 

 dipterous pupae both of them, as I believe, bear spiracles. 



