1918] PupcE of Common Sphingidce 419 



Two other species were reared to the pupal stage but adults 

 were not obtained. These may be S. Ugustri and S. canadensis, 

 but it seems better not to describe them at this time from a 

 single pupa, without being sure of the identification. 



The six common species described here may be separated 

 as follows: 



a. Maxillary loop less than 6 mm. long and extending one-fourth or less the 

 distance to the caudal margin of the wings; surface of antennae roughened 

 with four or five rows of minute tubercles, 

 b. Maxillary loop 3-4 mm. long, averaging 3 mm., extending less than one-fourth, 

 usuall}^ one-fifth, the distance to the caudal margin of the wings. 



S. luscitiosa 

 bb. Maxillary loop 5-6 mm. long, averaging 5 mm., extending one-fourth (or 

 perhaps slightly more) of the distance to the caudal margin of the wings. 



S. gordius 

 aa. Maxillary loop always more than 6 mm. long and extending for more than one- 

 fourth the distance to the caudal margin of the wings; surface of antennae 

 with less than four distinct rows of tubercles. 

 b. Maxillary loop closely applied to the ventral surface of the body; large, 

 stout pupae normally over 45 mm. long. 

 c. Transverse carinate ridge of metathorax prominent, extending at least 

 half way across the segment; maxillary loop 13-15 mm. long, usually 

 extending half the distance to the caudal margin of the wings; antennae 

 extending at least half way between the tips of the prothoracic and 



mesothoracic legs S. chersis 



cc. Transverse carinate ridge of metathorax inconspicuous, extending less 

 than half way across the segment; maxillary loop 9-11 mm. long, usually 

 extending two-fifths of the distance to the caudal margin of the wings; 

 antennas seldom extending beyond the tips of the prothoracic legs. 



S. drttpiferarum 



bb. Maxillary loop touching the surface of the body only at the bulbous tip; 



smaller, slenderer pupae, generally less than 40 mm. long. 



c. Maxillary loop 7.5-8 mm. long, extending about one-third of the distance 



to the caudal margin of the wings; antennae extending to, or slightly 



beyond, the tips of the prothoracic legs I 5. kalmicB 



cc. Maxillary loop 9.5-10 mm. long, extending nearly half the distance to the 

 caudal margin of the wings; antennae extending at least half-way between 

 the tips of the prothoracic and mesothoracic legs S. ereniitus 



Sphinx luscitiosa Clem. 



This species differs so little from S. gordius that a detailed description 

 is scarcely necessary. Its color differs somewhat, being a bright brown 

 and occasionally is marked with black blotches. The maxillary loop is 

 3-4 mm. long, usually 3 mm., and usually strongly curv^ed. It seldom 

 extends as much as one-fourth the length of the wings, usually one-fifth, 

 sometimes less. It appears slightly flattened, without any enlargement 

 at the end, and is seldom so deeply striate as S. gordius. The circular 

 area of sculpturing on the proximal part of the maxillse has not yet been 

 obseiwed. The scar of the caudal horn is usually made prominent by a 

 deep concavity behind it, but this varies somewhat. The cremaster 

 is not as rugose as 5. gordius and seldom shows lateral projections. 

 The length of pupa is 33-38 mm., the greatest width 9 mm. 



