[30 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.................. 
cerasi Felt, C. ar593a 
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 
juniperina 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. Jaq. cic saee oe ae crataegifolia Felt, C. a1555 
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.................. 
cincta 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. a1490 
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. a1572 
