770 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxm 



The mine is the usual Coptodisea mine, a short serpentine and 

 blotch mine, on the upper side of the leaf, ending- in an oval clear 

 blotch (3.5 b}" 2.5 mm.), the sides of which the larva cuts out and 

 makes into a flat case, which falls to the ground or is fastened with 

 silken threads to the twig. Between 30 and 40 mines were found in 

 a single leaf, and the numerous perforations added considerably to 

 the disfiguration of the leaves. 



The species is hardly distinguishal)le from Coptotrlche splendori- 

 ferella Clemens, though somewhat larger and differing slightl}" in 

 wing pattern. The darker head and the pronounced black pencil in 

 the white apical cilia are the best marks of recognition, ])ut careful 

 examination would have to be made in order to separate material not 

 bred, as is the case with the other species of the genus. They may 

 eventually all prove to be merely phy tophagic varieties of one species, 

 though 1 l)elievc I can distinguish ])etween the described species when 

 fresh-bred material is at hand. 



Family TINEID^E. 



LITHOCOLLETIS Hubner. 



LITHOCOLLETIS POPULIELLA Chambers. 



LitJiocolletis jwpuHella CHAyiBETis, Bull U. S. Geol. Sxirv., IV, 1878, p. 101. — Dyar, 

 List N. A. Lep., No. 6331, 1902. 



A large series of this species bred from small tentiform mines on 

 the underside of the leaves of JPojndus tremuloides by Doctor Dyar at 

 Kaslo, British Columbia. 



GRACILARIA Haworth. 

 GRACILARIA ELONGELLA Linnaeus. 



The extreme variability of this species is well known and has been 

 embarrassing to several lepidopterists before now. So eminent a spe- 

 cialist as Stainton described as new his GracilaTla inconstans,^^ giving 

 figures of seven different wing patterns, all of which he ultimatelj^ 

 realized belonged to elongeUa^ and that though he well knew this 

 species and immediately after '^ treats of its variability. 



I have long had in manuscript a revision of the American species of 

 Gracilarla of all of the described species of which I have authentic 

 specimens, but 1 have delayed its publication mainly on account of the 

 uncertainties about this species until such a time when more ample 

 and bred material would come to hand. I confess that while revising 

 this genus I had no thought of regarding as the same species any of 

 the following decidedly different looking insects: the uniformly red- 



«Trans. Ent. Soc. Lond., I, 1851, p. 125. &Idem., p. 127. 



