146 BULLETIN 132, UNITED STATES NATIONAL MUSEUM 



The male genitalia of the different species in this particular group 

 are very similar and there is little to distinguish them except minor 

 differences in the spining of the harpes ; so, for most of the species 

 genitalia photographs are omitted, and drawings of the harpes 

 supplied. 



Harpe of male genitalia figured from specimen in National Col- 

 lection from Ithaca, N. Y. (June 12, 1922). Female genitalia fig- 

 ured from specimen in Collection Cornell University from Peru, 

 N. Y. (W. T. M. Forbes). 



Bursa of female with slight signum. 



Specimens (males) in National Collection and collection Barnes 

 from Ithaca, N. Y., received through Dr. W. T. M. Forbes, who 

 ■writes that the species is not uncommon in that locality. There is 

 also a male from Bretton Woods, N. H., in the Barnes Collection 

 a rubbed and doubtful specimen from Illinois in the American 

 Museum, a male from British Columbia in the collection of E. H. 

 Blackmore, and a short series (males and females) in the Canadian 

 National Collection from Manitoba, Ontario, and Quebec. 



Alar expanse. — U9-20 mm. 



Type. — In British Museum ( ? ) . 



Type locality. — Massachusetts. 



Food plant. — Gornus. 



22. EXARTEMA TIUANUM Heinrich 



(Figs. 97, 214, 398) 



Exartema tilianum Heinrich, Proc. Ent. Soc. Washington, vol 25, 1923, 



p. 113. 

 Cymolomia tiliana Forbes, Memoir 68, Cornell Univ. Agr. Exp. Sta., 1924, 



p. 468. 



Close to permundanum Clemens and nigranuvi Heinrich. From 

 the former it is distinguished by the length of the teeth of the median 

 bar of fore wing. These are long in tilianum and short in perniun- 

 danuTTh. From both nigranuui and pei^nundanuvi it is distinguished 

 by the somewhat broadened tip of the uncus of its male genitalia. 

 The extremity of this organ is narrower in the other two species. 



Male genitalia figured from type; female from paratype in Na- 

 tional Collection from Chicago, 111. (Kwiat, "7-1^02"). 



Bursa of female without signum. 



Distribution. — New Jersey, Ohio, Illinois, Missouri. 



Alar expanse. — 18-20 mm. 



Type. — In American Museum. 



Type locality. — Greenwood Lake, N. J. 



Food plant. — Tilia aTnericana. 



