414 Annals Entomological Society of America [Vol. XI, 



Genus Dolba Wlk. 



This monotypic genus is also very closely related to Pro- 

 toparce, but more so to Atreus. In each of these genera there 

 is only one spiracular furrow present, a very distinct, deep, 

 pocket-like furrow. The body is typically sphingiform, with 

 the labrum mostly on the cephalic aspect of the head. There is 

 a distinct ridge along each lateral margin of the clypeus and 

 labrum, which shows as two small projections at the caudal 

 end in both dorsal and ventral views. This ridge sometimes 

 breaks up into tubercles. The maxillary loop varies consid- 

 erably in length, from 4 mm. in small specimens, to 8 mm. in 

 the large ones, but is always less than half the length of the 

 maxillae. The impressed line along the mesal margin of the 

 glazed eye-piece touches the antenna in this genus. The antennae 

 are slightly elevated, transversely striate, with two rows of 

 tiny tubercles extending for the entire length. The tibia of 

 the prothoracic leg is slightly swollen, but the femur is not 

 exposed. The cremaster is triangular, ending in a smooth 

 cylindrical point, which may be slightly bifurcate at tip. 



The species of this genus Dolba hylceiis is only found in 

 eastern North America so far as known. The larvae are fairly 

 common on pawpaw in the region around Urbana, 111., and 

 probably wherever its food plants occur. 



Dolba hylaeus Dru. 



Color yellowish to chestnut brown; head, thorax and appendages 

 with indeterminate wavy striations; abdomen with shallow indistinct 

 punctures on the first seven segments, the remainder distinctly punc- 

 tate, the dorsal surface showing about three annulets on each segment; 

 maxillary loop deeply transversely striate, the end very slightly bulbous 

 and usually closely applied to the surface, but occasionally slightly 

 elevated at the proximal end, the length between one-third and one-half 

 of the maxillse ; antennse extending about midway between the proximal 

 ends of the first two pairs of legs; mesothoracic spiracles with black, 

 elevated margins; spiracular furrows as in Fig. 4; scar of caudal horn 

 normally prominent, elevated, usually smoother and darker than the 

 remainder of the segment; cremaster 2 to 2.5 mm. long, rugose, with a 

 smooth spine at the end. Length of pupa 29-37 mm., greatest 

 width 7-S mm. 



Genus Ceratomia Harr. 

 This is one of the genera in which a study of the pupae does 

 not support the classification based on either the larvae or 

 adults. The larvae of the three species usually placed in this 



