their dwellings. The little white mine of L. fuscocostella 

 Cham, is never found elseAvhere than at the extreme edge of 

 the leaf of a7i oak, the edge being turned closely down over it. 

 There is always something peculiar to the mine of each species 

 of the genus, and the species may be as readily distinguished 

 by its mine as by the characters of the imago. 



The modes of pupation in the cylindrical group are as vari- 

 ous as in the flat group, and indeed some species pupate in an 

 ovoid cocoon of silk and frass, a mode which has not been as 

 yet observed among the flat larvae. The mines may be divided 

 into tentiform and blotch mines (but the mine of L. celtisella, 

 and a few others, seem to partake of both these characters), 

 and into mines of the upper and of the under surface (but 

 L. ornateUa of the flat groups and blotch mine, eats into both 

 surfaces, and L. tiliaeella of the cylindrical tentiform mine, and 

 occasionally a specimen of some other species, which usually 

 mines the under surface, mines the upper). The larvre may be 

 divided into the flat and cylindrical groups, but L. cincinnatiella 

 and L. coryliella, and perhaps others, show a tendency to con- 

 nect tlie two. 



At first sight the imagos of this genus seem distinctly divisi- 

 ble into those of which the ground color is white, and those in 

 which it is of some shade of yellow, varying from pale golden 

 to deep saffron, or to reddish orange. Every one of the white 

 section has a cylindrical larva and tentiform mine in the under 

 surface of the leaf, except that, as before stated, L. tiliaeella^ 

 and rarely a specimen of some other species, mines the upper 

 surface. Here then would seem to be a chance to divide the 

 genus, of which the species are too numerous for convenience. 

 But alas 1 many of the yellow group also have cylindrical larvte 

 in tentiform mines on the under side of the leaf, such, e. g., as 

 L. amhrosiaeella, L. argentinotella^ and L. quercitorum. In the 

 Nat. Hist. Tineina, Mr. Stainton has arranged them, merely 

 for convenience, I believe, in sections, according to the pres- 

 ence or absence of a basal and certain marginal streaks, an 

 apical spot, dusting, etc. ; but the basal streak is sometimes 

 present or absent in different specimens of the same species, 

 the marginal streaks and the fascia may be regarded as the 



