168 The Ohio Journal of Science [Vol. XX, No. 5, 



In the other type of pupa, the body is slender with the dorsum 

 •of the first three abdominal segments depressed and the median 

 ridge here low. From the dorsal view, the abdomen is elongate 

 and gradually tapering with its lateral margins almost straight, 

 and lateral ridges more prominent. In this type, the pupa is 

 dull, pale, of opaque appearance, sometimes shining chitinous 

 toward head. Examples are E. leucofrons, E. sylvestris and 

 E. irr Grata. The tubercles which reach an extreme development 

 in E. prcelineata, are usually minute or absent on the wings, 

 smaller on the head, and only very prominent on the sides of the 

 mesothorax. There are in certain species pointed projections 

 from the lateral ridges of the abdomen. In general, the tubercles 

 are most conspicuous in the first type of pupa. As is apparent 

 ■from the descriptions of the imagoes below, a grouping of the 

 species on imaginal characters would not coincide with a sep- 

 .aration on pupal characters. 



The types of the new species described below are at present 

 in the writer's collection. 



Elachista argentosa n. sp. 



Face and head silverv' gray, with a bluish metallic luster, palpi 

 silverv gray inwardly, fuscous beneath and outwardly; antennae deep 

 blackish brown throughout. Thorax deep golden brown, shading to 

 metallic gray behind. Fore wings almost black with faint golden brown 

 reflections in some lights; markings bluish metallic silvery. Base of 

 wing bluish metallic silvery ; a fascia just before middle produced a 

 little toward tornus on dorsum; opposite costal and dorsal streaks at 

 two-thirds, the costal curving outwardly in the middle of the wing and 

 sometimes slightly dilated at its tip before apex, and rarely met by the 

 dorsal streak; cilia dark brown. Hind wings broad, grayish brown, 

 becoming bluish along costa near base. Legs silverv* gray, middle 

 tibise and all the tarsi dark brown, with tips of segments silvery. 

 Abdomen shining fuscous. Expanse: 7-7.5 mm. 



Type (cf) and two paratypes, both males, reared from 

 larvae mining a narrow-leaved Carex, Clermont County, Ohio, 

 imagoes June 1-3; two captured specimens, male and female, 

 Cincinnati, Ohio, June 7 and 23. 



The mined leaves of Carex were collected May 3. The mine 

 extends from the tip of the leaf downward, lying nearer the 

 upper epidermis, and the parenchyma is mostly consumed. 

 The epidermis of the mine near the point of exit, which always lies 

 over the midrib, is slightly wrinkled. Earlier portions of the mine 

 ■ often extend beyond this point toward the base of the leaf, but 



