412 Mr. John Scott on New Species of Coleophora. 



folia two or three of the basal joints seem to diminish in thickness 

 until they arrive at a uniformity. In Wilkinsom the basal joint 

 alone is thickened, all the others being of an uniform thickness. 

 Nor do the antennae appear to be so long in the present species 

 as are those of s'lcc folia. The binder legs have a silvery-white 

 appearance, and when the light falls upon the tarsi in certain di- 

 rections they appear annulated. 



The larva mines the birch-leaves in August and September. 

 The case appears to be m.ade of a portion of the leaf of the food 

 plant, and is of a dark brown colour, growing deeper, through 

 various atmospheric causes, after the larva has retired to complete 

 its transformation. The case somewhat resembles those of Ji- 

 inineleUa and politella, but it is longer than the latter and not so 

 long as the former, neither is it bicolored as in these two species. 

 A great character in the formation of the case of Wilkinsoni is a 

 rounded projection towards the middle, on its underside, of a 

 greater or lesser size, the lower edge of which is parallel with the 

 mouth of the case, and rests upon the leaf both while the larva is 

 feeding and in a state of repose. This insect cannot be con- 

 founded with the birch-feeding species for which the name of 

 hetulfoUa (Ent. Annual, 1858, p. 115) was proposed, because in 

 the Ent, Annual, 1857, p. 134, this species is described with a case 

 similar to siccfolia. 



1 have named the insect after Mr. Thomas Wilkinson, of Scar- 

 borough, who has bred it now for four years, and who was the 

 first to call my attention to its peculiarities. 



