90 PROCEEDINGS OF THE AMERICAN ACADEMY 



are now longer than before, and all four are deep amber-yellow at the 

 end, the setai being black ; two out of the five spines of the 2d and 3d 

 thoracic segments a)"e dark brown at and near the ends, and give rise 

 to black bristles, rendering them very conspicuous ; they are a little 

 larger and higher than those on the abdomen, and bear about twice as 

 many bristles ; eight in all, all of which are black, while on the yellow 

 tipped tubercles of the abdominal segments there are about five bristles, 

 one of them minute ; two of the five are black, the others pale. The 

 two lateral rows of tubercles are, as before, with pale bristles. 



The median dorsal tubercle on the 8th uromere is not quite so 

 dark as those on the 2d and 3d thoracic segments, and some of the 

 latter are scarcely darker than the other abdominal ones. The spira- 

 cl'es are of the same pale color as before. The suranal plate still 

 bears the two terminal tubercles, as before. The thoracic legs are 

 now darker than before. 



In this stage the larvae sometimes assume a sphinx-like attitude. 



Stage III. — Moulted June 1. (I am not sure that it was the same 

 larva; one moulted May 31. Described three days after moulting.) 

 Length 13 and finally 15 mm. The head is either banded as before, 

 or all green, only the ocelli being black. The body is now thick, 

 though differing very slightly from the preceding stage. The four 

 prothoracic, the two dorsal 2d and 3d thoracic tubercles, and the single 

 median dorsal tubercle on the 8th uromere are either deep crimson 

 red at the end, or much paler, and in the largest one yellowish, the 

 tips of these tubercles varying a good deal in color; these tubercles are 

 now nearly twice as long and thick as those on abdominal segments 1 to 

 7 and 9. The tubercles of the two lateral rows are of the same size 

 as before ; those of the upper (supraspiracular) row are still green and 

 small ; those below, situated on the lateral ridge, are salmon-colored, 

 and provided with black setfe, like those arising from the dorsal tuber- 

 cles ; near, and on the base of and between the tubercles are tvhite, 

 delicate claoate hairs (glandular ?) which are not observable in the 

 preceding stage ; they are mostly confined to the abdominal, few, only 

 one or two, on the thoracic region. 



The thoracic legs are dark brown, pale at the tip ; the abdominal 

 legs except the anal pair, are green, with a transverse lilac line near 

 the ends ; beyond yellowish, while the plantae are tinged with lilac. 

 There is as yet no lilac tinge on the edge of the suranal {)late. 



Stage IV. — (Belonging to a later different brood ; described July 

 24.) Length 23 mm. The head now jDca-green, not banded in front, 

 nearly as wide as the body ; well rounded, and of the same shape as 



