320 AMERICAN MICRO-LEP1DOPTERA. 



Chambers records this rare species from Kentucky. I have 

 taken it at Cincinnati, Ohio, and Mr. W. D. Kearfott has collected 

 the mines in the early part of September in Jefferson County, West 

 Virginia. 



The mine, which is of the usual underside type, lies between two 

 veins, and is somewhat variable in shape. The pupa is suspended 

 in a few silken threads. The imagoes appear during the latter part 

 of September. 



IJflliocolletis lysimacliiseella Chambers. 



Lithocolletis lysimachiseella Chambers, Cin. Quart. Jn. Sci., ii, 100, 1875. Wai sing- 

 ham, Ins. Life, ii, 77, 1889. Dyar, Bull. 52, U. S. Nat. Mus., 1902. No. 

 6336. 



This is a name given to a species in the larval state, whose tenti- 

 form mines were found on the underside of Lysimachia lanceolata 

 Walt. (Steironema lanceolatum (Walt) A. Gray). No imago was 

 ever bred. I have never seen a mine of a Lithocolletis on this plant. 



GROUP II. 



The larva of the flat group (Plate XX, Fig. 10) is very much 

 depressed, almost flat, with the sides of the segments projecting, thus 

 giving the entire larva a beaded appearance. The head is flat, 

 somewhat triangular in shape, usually of a shining reddish brown 

 color, with the mouth parts projecting in front. The first three 

 segments of the body are broader than the others ; the body tapers 

 toward the posterior end. While the legs are of the same number 

 and occupy the same position as in the cylindrical larva, all are 

 very rudimentary, appearing as small tubercular projections. Upon 

 the upper and lower side of most and sometimes all of the body seg- 

 ments are distinctly outlined, shining, darker spots the maculae. 

 These vary in shape on the different segments, being elliptical or 

 trapezoidal, but are constant for a given species in each stage. 

 After the seventh or last moult, the larva assumes a more cylindri- 

 cal shape, the legs are better developed, and the dark maculae grad- 

 ually disappear. 



All of the species are miners on the upper side of leaves, where 

 they make a flat, sometimes irregularly shaped blotch, or a rather 

 broad, linear tract. The larva feeds from the centre outwardly, 

 thus gradually increasing the extent of the mined portion of the 

 leaf. This mode of feeding is a necessary accompaniment of the 



