130 NEW YORK STATE MUSEUM 



or rolled leaves. It is doubtful if species referable to this genus are 

 responsible for the vegetable deformities or even partly so. We 

 can not, in the present state of our knowledge, make definite state- 

 ments respecting the habits of these forms. Certain species in the 

 following table are given in two divisions as having the wings either 

 hyaline or spotted. This is due to the fact that it is very difficult 

 to draw a sharp line between spotted and unspotted wings in cases 

 where there are intergradations. Furthermore, females which are 

 not represented in the following table, frequently have spotted wings, 

 while their consorts have the organs of flight hyaline. This character, 

 though variable, is a very convenient one upon which to make pri- 

 mary divisions. 



Key to Species 



a Wings hyaline 



b Wings narrow, the length three times the width 

 c Abdomen brownish 



d Abdomen yellowish brown, the stems of the fifth antennal seg- 

 ment with a length three and one-half times the diameter, the 

 distal node with a length one-fourth greater than its diameter; 



reared from fusiform galls on cherry twigs 



c e r a s i Felt, C. ai593a 



dd Abdomen reddish salmon, the fifth antennal segment having the 



stems with a length three and one-half times the diameter, the 



distal node with a length equal to its diameter, circumfila long 



j u n i p e r i n a Felt, C. 746 

 cc Abdomen yellowish 



d Abdomen pale yellowish, the fifth antennal segment having the 

 stems with a length three times the diameter, the distal node 

 with a length one-third greater than its diameter, circumfila 

 rather long; reared from a cylindric fimbriate leaf gall on 



Crataegus crataegifolia Felt, C. 31555 



dd Abdomen yellowish, the second to fourth segments fuscous, the 

 fifth antennal segment having the stems with a length two and 

 one-half times the diameter, the distal node with a length one- 

 half greater than its diameter, style short 



c i n c t a Felt, C. 465 

 ddd Abdomen fuscous yellowish 



e Style short, the fifth antennal segment having the stems 

 with a length two and one-half times the diameter, the 

 distal node with a length one-half greater than its diameter, 

 not constricted; reared from rolled edge of poplar leaf. . . 

 populifolia Felt, C. 31490 

 ee Style long, the fifth antennal segment having the stems with 

 a length three and one-half times the diameter, the distal 

 node with a length one-third greater than its diameter, 



constricted; reared from rolled ash leaves 



fraxinifolia Felt, C. 31572 



