OF WASHINGTON. 189 



Lithocolletis obstrictella Clemens. 



One type, right fore wing and abdomen missing. Clemens' 

 No. 22 ; alar exp., 7.5 mm. 



I have no specimen like this type, which was bred, according 

 to Clemens, from the underside of leaves of oak. The know 

 ledge of the mine ought to insure its rediscovery. 



Lithocolletis caryaefoliella Clemens. 



Two types, one perfect, the other consisting only of head and 

 left fore wing. Clemens' No. 23 ; alar exp., 6.5 mm. 



Bred specimens compared with the type are in the U. S. Na 

 tional Museum. The generally accepted synonymy, suggested 

 by Clemens himself, with Lithocolletis juglandiella Clemens, is 

 probably correct. This latter species was named from the larva 

 and mine only. 



Lithocolletis aceriella Clemens. 



One type, almost totally destroyed, only the head left on the 

 pin, Clemens' No. 24. 



In the U. S. National Museum are specimens bred from upper 

 surface mines on maple which agree with Clemens' description 

 and with what is left of his type. They undoubtedly represent 

 this species. Alar exp., 6.5 mm. 



Clemens states that the larva is found also in the leaf of Hama- 

 melis virginica, but I am inclined to believe that he was mis 

 taken and that the exceedingly similar but slightly larger species, 

 which I have repeatedly bred from witch hazel, is a distinct spe 

 cies. It differs from aceriella in the more reddish tuft, in the 

 somewhat darker ground color and in the dorsal silvery streak 

 above the cilia, which is more oblique, nearly parallel with the 

 edge, while in aceriella it is more erect. Further, the two silvery 

 fasciae are, in the Hamamelis feeder, absolutely parallel, while 

 they are slightly diverging in aceriella. The Hamamelis feeder 

 may be known as Lithocolletis hamameliella. 



Alar exp., 7 mm. 



Type. No. 6772, U. S. National Museum. 



Lithocolletis guttifinitella Clemens. 



One type, right fore wing missing, otherwise in perfect condi 

 tion, Clemens' No. 25 ; alar exp., 7 mm. 



Clemens describes the antennae as blackish brown, omitting the 

 silvery annulations, which are shown on type. Otherwise, it is 

 a good description of the type, which represents the one extreme 

 variety of our common u poison ivy" Lithocolletis, which has 

 the two transverse fasciae nearly straight and diverging, the outer 

 one being nearly perpendicular on the edge of the wing, while 

 the inner one is oblique, nearer base on the dorsal side. 



The other extreme of this variable species is described by Frey 

 and Boll as Lithocolletis toxicodendi.* This has the two fasciae 



* Stett. ent. Zeit., xxxix, p. 273, 1878. 



