NORTH AMERICAN LEPIDOPTERA. 53 



At rest they often liave a habit of elevating the head and thoracic 

 segments, and somewhat curving them in sigmoidal shape, and it is 

 supposed that this habit, giving them a fancied resembhmce to the 

 Egyptian Sphinx, prompted the name. 



According to Lintner the larvae of most Sphinges have eight ob 

 lique folds or wrinkles to each segment which he calls annulets, and 

 uses the term very often in the larval descriptions. 



Concerning the larva of the Sphingkhe Boisduval says they are 

 smooth, cylindrical, elongated, slightly swollen posteriorly, generally 

 furnished with a horn on the penultimate segment, or sometimes with 

 a little lenticular shield in place of the horn. They live solitarily 

 on trees, shrubs or low plants. 



The Smerinthides have larvae with habits and with the horn of 

 the eleventh segment as in the other Sphlngldoe, and are particularly 

 distinguished by having, in most instances, the head triangular and 

 the skin shagreened or rugose. 



The EuRYGLOTTiDES have larvre with rounded head and smooth, 

 never shagreened skin. There is usually a horn to the eleventh seg- 

 ment, and in most cases a series of oblique lateral stri})es. 



The Deilephilides have smooth larvje with globular head, are 

 often rather brightly colored and marked with ocellate spots. Some 

 of them, which might almost constitute a tribe by themselves, have 

 the first three rings more slender than the rest and retractile. Some 

 have a horn on the eleventh segment ; others, forming the exception, 

 a little wart-like plate. In some others again the horn exists only in 

 the earliest stages and disappears completely in the adult. 



The Macroglossides have larvse which are generally green, moi-e 

 or less rugose dotted, even sometimes a little shagreened. They are 

 attenuated anteriorly, and the head is globose. Usually with a more 

 or less developed straight or curved horn the eleventh segment. 

 Some have longitudinal lines, others oblique lines as well, while some 

 have ferruginous lateral spots. 



When full grown they either pupate above ground between leaves 

 in a slight cocoon, or go deep under ground and pupate in a cell. 



The pupjB are variable in shape and will be more closely described 

 with the species. Prof. Riley has described a peculiarity of pupal 

 structure in Ceratomia cataljxe, which will be quoted under that spe- 

 cies. He says it is found in a modified form in some other species, 

 and he intends to make a close study of the structure throughout the 

 family. 



