39 



others vitreous, capped on outside with black, that with yellow. 

 Body beneath pink between tenth and last segments. Caudal 

 horn prominent, stout, curved backward, light blue in color with 

 yellow and pink point. Larvae varying from 30 to 50 mm. in 

 length. Pupa very dark uniform brown almost black. Compar- 

 atively very active in this state. It is enclosed in a thin parch- 

 ment like cocoon made under leaves on the surface of the 

 ground. 



There is much difference in the amount of red markings upon 

 the larvae. Some few are suffused with a crimson shade, and 

 many are strongly marked with red forming dorsal and lateral 

 stripes. 

 The former seemed to be of an albino character. 



We cannot agree at all with the suggestion of Mr. Grote, that 

 the larvae seem to connect the insect with the Hesperians. It is a 

 true sphynx larva. It does not more than the larva of Darapsa 

 myron, and other sphinges resemble the larva? of the^Hesperians. 

 It does not spin a web, or live in a webbed union of leaves during 

 the larval state. It does pupate in a cocoon, but so do many 

 Bombycidae, Noctuidae and Geometridae, and so do the Darapsae to 

 which in cocoon and larval habits it is very similar. 



It is two or more brooded in this latitude— generally, possibly 

 always, only two brooded, though we found a full grown larva 

 June 1st, which gave the insect a great plenty of time to go 

 through all the transformations of two or more broods by the 

 middle of August. At the same time one or two of a brood going 

 into the pupal state about July 1st still remain in that state, 

 while those of later broods freely emerged. Tbis fact we have 

 observed in the history of the Darapsae also. 



The size is, as with all insects, subject to much variation, and 

 the specimens are made large or small, or, in other words, are 

 made of the forms floridensis or uniformis almost if not quite at 

 ones pleasure by different methods of rearing. Reared in a glass 

 jar, with much moisture in the air, with high average tempera- 

 ture, and with plenty of food, and the result is floridensis; reared 

 in the open air, with neglect in food, and the result is uni- 

 formis. 



As it was, by rearing in the open air under practically the 

 same circumstances, the spring form varied from 45 mm. to 56 mm. 

 in expanse of wing. The Thysbe form varied much less in ex- 

 panse than did the other. 



