258 Journal New York Entomological Society. t Vo1 - xxvil. 



segments yellow ; beneath, including legs, yellowish green, claws dark brown. 

 Length sJ4 mm. 



Type and allotype in author's collection. Described from a pair 

 taken by me in copula on Quercus velutina at Bronxville, Westchester 

 County, N. Y., June 15, 1913. In addition to this pair I have before 

 me a series of twelve males and fourteen females taken at the same 

 place and on the same species of oak; also a female taken at Ithaca, 

 N. Y., and two males, one from DuBois, 111., and the other bearing 

 the label " L. E. Lea, Agri. Col. Miss." These three become para- 

 types, and are returned to the collection of Mr. W. D. Funkhouser, 

 who kindly lent them to me. Paratypes will also be placed in the 

 collections of the National Museum, and of the American Museum of 

 Natural History in New York. 



This species averages distinctly smaller than flava, the females 

 ranging from 6-6 l / 2 mm., and the males from 5^-6 mm.; and in the 

 female it is wholly pale green, whereas flava is apt to be more or less 

 suffused with rosy, particularly on the apical half of the pronotum 

 and beneath. The form of the hook at the base of the elytra in the 

 specimens examined is much more acute and upturned than in flava, 

 and, if reliance can be placed on a structure which is subject to such 

 a degree of variability, may perhaps alone serve to distinguish the 

 two species. The males, aside from size, are easily separable on color 

 differences from O. fratema Gibson and Wells, and from O. pubes- 

 cens Emmons, which latter they more nearly resemble in size and 

 color pattern, though conspicuously paler and less densely hairy. In 

 my experience flava is almost always found on Quercus rubra, while 

 evelyna is found on Quercus velutina. 



The following key to the several species of the genus as under- 

 stood by me, including those above described, has been drawn with 

 those published by Mr. VanDuzee and by Gibson and Wells before 

 me; to whom, as well as to all who have assisted me with material 

 and helpful suggestions and advice, and in particular to Messrs. W. 

 D. Funkhouser and Wm. T. Davis, I would acknowledge my indebted- 

 ness. It has been my aim in preparing the key to make use of such 

 characters as are readily apparent, such as color, in spite of its varia- 

 bility, and to avoid the use of those which the inexpert might find 

 difficulty in discerning, as for instance the degree of sinuation of 

 facial outline; and it is believed that by its use the proper specific 



