92 THE GENUS CORYTHUCHA 



30. Corythucha coryli Osborn and Drake 



1917. Corythucha coryli Osborn and Drake, Ohio Jr. Sci., xvii, no. 8, p. 299. 



Hood at least twice as high as the median carina, and distinctly longer. 

 Height of hood nearly two-thirds its own length. Median carina arched. 

 Reticulations of hood very large. Spines on membranous margins quite long, 

 scarce on nervures. Costal margins of elytra distinctly concave. Small 

 species, 2.8 mm. long, 1.52 mm. wide. 



Hood embrowned. Brown band across base and apex of elytra. Apical 

 band with no large hyaline areoles. 



This species is noticeably smaller than incurvata Uhler, from 

 which it may also be distinguished by the distinct dark apical 

 band on elytra. 



The type and two paratypes in the Drake collection have been 

 examined. They were collected on Hazelnut {Corylus americana), 

 by Mr. W. L. McAtee, at Plummer's Island, Maryland, 1914. 



This species was known to Mr. Heidemann under his manu- 

 script name hulata. 



31. Corythucha borealis Parshley, new species 



Pronotal hood at least twice as high as median carina and noticeably longer. 

 Height of hood at least one-half its own length and not noticeably greater 

 than length of median carina. Lateral carinae very low and short. Reticula- 

 tions of hood larger than those of paranota. Spines normal in size and number. 

 Costal margins of elytra straight. Size, 2.8 mm. long, 2 mm. wide. 



Hood more or less embrowned. A light brown spot on paranota. Light 

 brown band across base and apex of elytra. Apical band without any entirely 

 hyaline areoles. Tumid elevations and inner borders of elytra light brown. 



Tijpe. — 9 , Orono, Maine. (Collection of H. M. Parshley.) 



Allotype. — cf, same data as type. Paratypes. — Two females, 

 same data as type. 



Food plant unknown. 



32. Corythucha incurvata Uhler 



1894. Corythucha incurvata Uhler, Proc. Cal. Acad. Sci., iv, p. 280. 



Pronotal hood very large, twice as high as median carina, and its height equal 

 to two-thu-ds the length of the hood. Length of hood considerably greater than 

 length of median carina. Hood abruptly constricted at the middle, globose 

 portion wider than long, not flattened on top or posteriorly. Reticulations of 

 hood large. Median carina arched before. Lateral carinae of medium height, 

 short, terminating a considerable distance from base of hood. Costal margins 

 of elytra distinctly concave. Spines on membranous borders short. Length 

 3.3 mm., width 2.9 mm. 



