Mar., 1920] Notes on Elachista 169 



t 



the epidermis is nowhere else wrinkled. The pupa is surrounded 

 by a very open irregular network. It belongs to the stout ovate 

 shining chitinous type. There are rows of minute tubercles on 

 dorsum of mesothorax, prominent tubercles on sides of mesotho- 

 rax, faint lines of tubercles on the wings, and prominent tubercles 

 on front of head. 



Allied to E. madarella Clem, with which it agrees exactly in 



• venation and breadth of hind wing. The dilated portion of the 



costal streak before the apex almost corresponds in position 



with the pale golden spot ' ' in the middle of the wing before the 



tip" in that species. 



Elachista sylvestris n. sp. 



Face and head silvery gray, with a slight yellowish tinge, shading 

 to golden brown behind; palpi silvery, with the lower and outer surface 

 of second segment blackish, third segment toward apex with a little 

 black outwardly. Antennae blackish brown, apical fifth whitish in both 

 sexes. Thorax and fore wings blackish brown with a faint golden brown 

 luster ; the tips of tegula? and tip of mesothorax silvery ; a silvery patch 

 at base of wing broadest on dorsum; a nearly straight almost perpen- 

 dicular slightly irregular silvery fascia just before middle; a silvery 

 tornal spot reaching middle of wing and a costal silvery spot a little 

 beyond it reaching to or slightly beyond the middle of the wing and 

 curving a little outwardly in the middle of the wing; cilia dark brown. 

 Hind wings and cilia dark brown. Legs dark brown, tips of segments 

 silvery and a silvery band around basal third of hind tibia". Abdomen 

 dark brown above, silvery beneath. Expanse: 8-8.5 mm. 



Type (cf) and twenty-two paratypes (7 d^'s and 15 9's), 

 reared from larvae mining leaves of Poa sylvestris, Cincinnati 

 and vicinity, imagoes May 30 to June 6. 



The mines are found upon the stem leaves of the grass in 

 May. The early inconspicuous mine, 13^ to 2 inches long, lies 

 along the margin of the leaf. The larva leaves this mine, and 

 enters a leaf at its tip, making a white mine about three inches 

 long extending entirely across the leaf, in which the parenchyma 

 is entirely consumed. As no empty egg-shells were found on 

 any of the mined leaves, the moth soon after emerging pre- 

 sumably deposits the eggs at the base of the plant, and the 

 young larvEe do not hatch until the following spring, when they 

 crawl up the flowering stems. Larva entirely pale yellow. Pupa 

 without cocoon, of the slender elongate type, pale yellow, 

 opaque, shining chitinous only toward head; with irregular 

 projecting tubercles on mesothorax. 



