498 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 48. 



6-annulate (fig. 1); pleural fold lobed and tuberculate; prolegs some- 

 what reduced, on segments 6-12 and anal; anal segment with a 

 pair of subanal protuberances (they are subdorsal and basad of 



the anal plate); plate armed apically 

 with 4 spines, the median ones called 

 the subdorsal pair, the lateral ones, the 

 lateral. 



Prepupa. — Similar to larva, though 

 more concolorous. Head pale and 

 more nearly round than that of larva, 

 being somewhat depressed. Thorax: 

 Pleural fold not distinctly lobed and 

 not tuberculate; pro thoracic and meso- 

 thoracic protuberances present but 

 much reduced. Abdomen: Pleural fold 

 not distinctly lobed and not tuber- 

 culate; p'air of subanal protuberances 

 nearly obsolete; armature of apical 

 plate much reduced, becoming tuber- 

 culate. 



Cocoon. — No cocoon is spun; pupa- 

 tion occurs in a capsule-shaped cell in 

 soil. The size of cell is approximately 

 7 mm. long by 2.5 mm. in diameter. 



Fig. 1. — Lateral view of seventh 

 (third abdominal) segment of dl- 

 morphopteryx castaneae. 



Synopsis of the larvae studied. 



Head dorsally prominent and conelike, considerably blackened at apex (see fig. 2); 

 prothoracic and mesothoracic protuberances concolorous, pale yellowish. Host: 



Castanea dentata castaneae Rohwer 



Head rounded, not prominent and conelike, darkened but faintly at apex (fig. 3); 

 prothoracic protuberances whitish or slightly darkened, mesothoracic protuberance 



black. Host: Quercus species 1. 



1. Prothoracic protuberances slightly darkened, projecting from whitish portion of 

 segment; lateral anal spines nearer to subdorsal spine than subdorsal spines are 

 to each other (fig. 4) ; emargination between subdorsal spines U shaped, emargin- 

 ation between lateral and subdorsal spines V shaped. Host: Quercus rubra. 



autumnalis Rohwer 



Prothoracic protuberances whitish, projecting from faintly darker, subdorsal 



lines; subdorsal anal spines closer together than to lateral spine; emargination 



between the subdorsal spines sharply V shaped, between lateral and subdorsal, 



sub-U-shaped. Host: Quercus rubra quercivora Rohwer 



DIMORPHOPTERYX CASTANEAE Rohwer. 



Plate 28. 

 Host . — Castanea dentata . 



Larva. — All the stages have been determined from the study of a 

 single larva but additional characters from other larvae examined 

 have been incorporated. 



Stage I. — Length, 4.5 mm.; prothoracic width, 0.875 mm.; head, 

 0.875 mm. high (dorsad-ventrad length) by 0.5 mm. broad, below 



