48 PAPEKS BY DK. B. CLEMENS. 



but little difficulty, to refer it to the appropriate principal 

 group formed on this basis. The individuals, thus assembled 

 together, agree not only in general structure, but in embryonic 

 histories and in larval forms, so far as my own observation 

 and study of other fauna than our own has enabled me to 

 determine the question. The agreement in embryonic form 

 extends into the group Tortricina, and the relationship in 

 the imago is likewise expressed to a certain degree in the 

 neuration of the wings of this latter group as compared with 

 that of the Tineina. These characters, however, are suffi- 

 ciently marked in each, and can scarcely be mistaken in 

 either instance by one of ordinary powers of discrimination. 



Without, therefore, attempting to fix at present the limits 

 and characters of the group, more definitely than by the 

 wing structure, and rejecting the generic values usually as- 

 signed to it, except where there is characteristic variation, 

 we will proceed to describe generic groups and their indi- 

 viduals. 



Imago with the nervules of the anterior wings radiating 

 chiefly from the posterior part of the disc, with four to five 

 subcosto-marginal nervules, the first of which arises near the 

 base of the wing, with two* simple disco-central nervules, 

 with the median nervure branching near its posterior ex- 

 tremity into three nervules medio-superior , central and pos- 

 teriory with the submedian fold well marked, and the sub- 

 median nervure simple and usually bifid toward the base. 

 Posterior wings with bristle, with costal nervure simple, with 

 subcostal usually simple and attenuated toward the base of 

 the wing, emitting a discal nervure from which arise at least 

 two disco-central nervules, with median either bifid or trifid, 

 with submedian fold and simple submedian nervure, and an 

 internal fold or nervure. 



Dr. Clemens has written in pencil on the margin of my copy of this paper 

 "or three." H. T. S. 



