88 



often shading into the ground color on the outer edge or coalescing 

 near the inner margin ; all the markings, especially the subapical den- 

 tate spots, equally distinct in both sexes ; right clasper of male with 

 two rather long teeth; ventral portion of the seventh abdominal seg- 

 ment of female broader than long, with caudal margin broadly emar- 

 ginate. 



Erechtea has the front wings above of a dark or light drab gray (in 

 many females with brown or olivaceous) shade, with the two large dark 

 bands always separate, distinct, and well defined toward the inner 

 margin in the male; in the female the markings always much less dis- 

 tinct, the subapical dentate spots never as distinct as in the male or as 

 in the female of crassiuscula; right clasper of male with but one long 

 curved tooth; ventral portion of the seventh abdominal segment of the 

 female as long as broad, with the caudal margin broadly rounded. 



Crassiuscula is slightly smaller, more variable, and marked alike in 

 both sexes. Erechtea is very constant among the males, but variations 

 of brown and olivaceous occur among females from the same brood of 

 larvae. After a few specimens of each species have been separated, 

 these differences will be very noticeable, but specimens occur which it 

 is almost impossible to separate by markings alone, and the structural 

 characters must then be examined. These sexual structures are a very 

 striking peculiarity of Drasteria. The asymmetry of the male genitalia, 

 so far as I know, has not been before met with among the Heterocera. 

 The differences in the female structures noted are very surprising be- 

 tween two such closely allied species. These sexual structures vary 

 slightly in individuals, but never grade toward each other. 



There are three broods of crassiuscula annually in New York, moths 

 appearing in May, July, and September. About one-half of the mid- 

 summer brood and all of the fall brood hibernated as pupae in cocoons 

 of grass and clover leaves. The moths emerging in the spring are on 

 an average smaller than the others, but both large and small appear in 

 all the broods. 



The life-history of erechtea is similar, I think. I now have larvae of 

 the second brood from moths emerging in July. 



Should the species ever become serious pests, I believe the plowing 

 of infested fields would destroy many larvae and pupae. 



AFTERNOON SESSION. 



The Association met, as per adjournment, at 2 p. m.; the minutes of 

 the previous session were read and approved. 



On motion of Mr. Smith, seconded by Mr. Forbes, it was decided that 

 at future meetings the minutes of the first day's sessions should be 

 presented and passed upon at the morning session of second day. 



Mr. Slingerland was elected to active membership, and Messrs. E. 

 0. Ootes, Charles French, and W. M. Schoyen to foreign membership. 



