88 PROCEEDINGS OF THE AMERICAN ACADEMY 



The following description is drawn up from individuals which had 

 been hatched for about a week (May 24-26), and were near the end 

 of this stage. The body was larger, fuller, and less tapering pos- 

 teriorly than at first. The head is small, about half as wide as the 

 body, rounded, and at rest can be retracted within the prothoracic seg- 

 ment. There is a transverse dark brown hand in front just below the 

 vertex, making two scallops, and ending on the sides ; on each side 

 (below) of the front edge of the clypeus is a dark spot around the base 

 of the antennae, which sometimes sends a short line inwards, as in 

 Mr. Bridgham's figui'e. 



The body is thick, full, cylindrical, each segment, except the protho- 

 racic and last two abdominal ones, with six thick, smooth conical tuber- 

 cles, those on the sides above the spiracles smaller than those below, 

 and about one half the size of the dorsal ones, and bearing fewer 

 bristles than the others. Prothoracic segment with only four tubercles, 

 the two dorsal ones low, flattened, and small, with about fourteen radi- 

 ating bristles. The lateral tubercles are like those of the other seg- 

 ments ; the rest of the dorsal tubercles are large, full, nearly touching 

 at their base, and bearing about eight to ten bristles, which are one half 

 to one third longer than the tubercles themselves ; they radiate and 

 are dark purplish, pale at base, those on the back darker than those 

 arising from the lateral tubercles. The 2d and 3d thoracic dorsal 

 tubercles are slightly larger than the abdominal ones. Each of the dorsal 

 abdominal tubercles bears about six bristles. The body is delicate 

 pea-green, nearly like the under side of the Carya leaf on which they 

 feed. The tubercles, especially the dorsal ones, are tinged with faint 

 straw or lemon yellow, while the lateral supraspiracular tubercles are 

 greenish, scarcely tinged with yellow. 



The bristles are longer in proportion to the tubercle than in the 

 larva of C. promethea ; most of them are three times and some four to 

 five times as long as the tubercle. The bristles are sparingly and 

 minutely barbed, tapering acutely, but they are clear, and perhaps 

 glandular. 



The median dorsal tubercle on the eighth uromere shows traces of 

 its double origin, but they are not so marked as in G. promethea and 

 T. polyphemus, but more so than in Platysamia cecropia. It is much 

 broader than long at base, and on the tip bears five setae on each side. 

 The ninth uromere bears four tubercles of equal size, which are large 

 and well developed, the lateral ones scarcely smaller than the dorsal 

 ones. The suranal plate is broad and short, more so than in T. poly- 

 phemus, not tubercled, but bearing two tufts of bristles which are but 



