246 NEW YORK STATE MUSEUM 



thick subbasal whorl and a scattering subapical whorl of short 

 setae and stout circumfili near the basal third and apically on these 

 segments. The antennae may have from 16 to 22 segments. .The 

 femora are strongly swollen and the tibiae, particularly the posterior 

 pair, are armed with long, setose spines which, in some forms extend 

 to the base of the second tarsal segment. The male genitalia presents 

 a very characteristic type, differing markedly in some respects 

 from those of other Itonididae. The genus Choristoneura Rubs, is 

 preoccupied by Choristoneura Mabille. 



Practically nothing is known concerning the life history of these 

 interesting forms. Rubsaamen believes that members of this genus 

 may be parasitic in habit. The one American species reared was 

 obtained from a jar containing galls of well-known Itonids, upon 

 which it was probably parasitic, since no peculiar deformity could 

 be recognized as its habitat. 



Key to species 



a Females 



b 16 antennal segments; abdomen and tibiae dark brown, the fourth palpal 



segment with a length one-half greater than the third 



karnerensis Felt, C. 484 

 bb 20 antennal segments; abdomen dark brown; tibiae pale yellowish, the 



fourth palpal segment twice as long as the third 



subfuscata Felt, C. 618 

 bbb 22 antennal segments 



c Claws stout, legs thickly clothed with scales, the first antennal seg- 

 ment with a length four times its diameter; reared from Solidago. . 



s o 1 i d a g i n i s Felt, C. ai568y 

 cc Claws rather slender, legs rather thinly clothed with scales, the first 



antennal segment with a length thrice its diameter 



c a u d a t a Felt, C. 477 

 aa Males 



b 18 antennal segments, the first with a length four times its diameter: 

 abdomen thickly clothed with silvery scales, fourth palpal segment 



one-fourth longer than the third squamosa Felt, C. 522 



bb 20 antennal segments 



c Fifth antennal segment with a length more than three-fourths its 

 diameter 

 d First antennal segment with a length two and one-half times 



its diameter car'yae Felt, C: 334 



re Fifth antennal segment with a length scarcely three-fourths its 

 diameter 



d Abdomen silvery white; tibiae dark fuscous orange 



a r g e n t i Felt, C. 466 



dd Abdomen silvery yellow; tibiae and tarsi black 



t a r s a t a Felt, C. 667 



ddd Abdomen pale brown ; tibiae dark brown 



m e t a 1 1 i c a Felt, C. 335 



