208 The Ohio Journal of Science [Vol. XXI, No. 6, 



toward the posterior end of the first thoracic segment on each 

 side of the middle. Pupation takes place toward the end of 

 April or in May. The pupa lies on the upper surface of a leaf 

 over the midrib and is covered by a flat cocoon, formed of two 

 series of oblique parallel threads of silk, crossing one another 

 at an acute angle. The pupa is more nearly allied to the 

 stout ovate type, but the dorsal abdominal surface is flattened, 

 without median or lateral ridges, but with a dorso-lateral series 

 of erect short blunt spines, one spine on each abdominal segment 

 except the first; three or four prominent lateral mesothoracic 

 tubercles. 



This species is closely allied to E. madarella Clemens, 

 agreeing with it in venation and in shape of the hind wings, and 

 differing from it only by the entirely black antennae, the darker 

 head, less golden base of fore wing, and darker legs. It is 

 apparently rather rare and local, as I found the larva in but one 

 locality, although the food plant is very common. 



Elachista madarella Clemens. 



Specimens of this species were reared from mines on several 

 species of Carex, very commonly on Carex pubescens and Carex 

 cristata, and on Scirpus atrovirens. The mine is very similar in 

 character to that just described for E. enitescens, and is indis- 

 tinguishable from it on Scirpus. The larva makes several 

 mines, the earlier ones in the outer overwintering leaves, the 

 later ones in the new inner basal leaves. The larva feeds in 

 the upper end of the mine during the night, retiring down into 

 the base of the leaf almost to the rootstock during the day. 

 Mining larvce were collected from April 3 to May 16. 



Larva whitish or pale green, with the first thoracic segment marked 

 with a pair of prominent dark brown or blackish L-shaped marks. 

 Pupa covered with a flat cocoon formed of two series of parallel silken 

 threads, as in E. enitescens; very similar to that of enitescens, but 

 somewhat broader, with rougher thorax, and across vertex, a transverse 

 beaded ridge, with a broad sinus in its middle. 



The reared imagoes emerged from May 24 to June 28; a few 

 captured specimens were taken as late in the season as July 10. 

 Often the silvery gray at the base of the wing is almost entirely 

 replaced by the pale golden color of the fascia. 



