164 THE CANADIAN ENTOMOLOGIST. 



other from a mine on the underside of a leaf of S. hvigifolia ; and I have 

 found empty mines exactly like them and containing the same dark brown 

 pupa skin, on the leaves of the Yellow Willow ( S. alba), and it was in 

 leaves of this species that Dr. Clemens found his mines. These mines 

 were not '"near the base along the edge." and were not confined to any 

 particular portion of the under surface. I have seen another smaller mine 

 near the base and at the edge of the leaf, which may be that of a Litho- 

 colletis, but which is more probably that of a Graeillaria. And I have but 

 little doubt that the species now to be described is the same that was 

 referred to by Dr. Clemens. But I am not certain that it is not the 

 European species L. pastorella. That species also feeds on S. alba, which, 

 as well as S. Babylonica, is an imported species, and if either of these 

 trees is its original food-plant, then L. salicifoliella is not an indigenous 

 species. But if S. longifolia is its original food-plant, then it is. In 

 Staintoirs arrangement of the species, L. pastorella belongs to his group 5. 

 " Anterior wings dull whitish-gray, with indistinct darker marginal mark- 

 ings ;"' and he places it next before L. populifoliclla, which he figures. 

 (Nat. Hist. Tin. v. 2, plate 7, fig. 1) and which has, as figured, a strong 

 general resemblance to this insect. It is therefore not impossible that this 

 is L. pastorella. It is intermediate between L. populifoliella and L. sylvella 

 as figured by Stainton, and in the arrangement of the species which I have 

 followed, it should follow L. hamadryadella, which also bears considerable 

 resemblance to L. sylvella. L. hamadryadella, however, resembles this 

 species rather in the colour of the markings than in the arrangement of 

 them. 



The specimen from the Weeping Willow has the palpi and lace 

 white, the face flecked with a few pale yellowish gray scales. Tuft 

 brown with intermixed grayish -brown scales. Antennae white, each 

 joint tipped above with pale grayish-brown. Thorax and anterior 

 wings white, thickly dusted with grayish -brown, and the markings of 

 the wings are drab, gray-brown or pale golden, according to the light. 

 There is an oblong streak of this indescribable hue on the base of the 

 costal margin, and a rather indistinct patch of the same near the base of 

 the dorsal margin, but not touching the margin ; a slightly curved, angu- 

 lated fascia of the same hue at about the basal fourth : a slightly oblique, 

 rather wide costal streak of the same hue just before the middle, and dark- 

 margined behind upon the costa : it extends to the middle of the disc, 

 where it is bent backwards, and is posteriorly produced almost to another 

 straight fascia of the same hue, which is placed behind the middle, it is 



