Mar., 1920] Notes on Elachista 171 



The larvae mine the basal overwintering leaves from October 

 or November until April of the succeeding spring. The following 

 description is made from mines collected in the latter part of 

 March, when the larvae were nearly full grown. The mine is 

 grayish, extending from the tip of the leaf-blade downward and 

 broadening somewhat below. At about the middle of the mine 

 the true upper epidermis of the leaf, which in this grass faces 

 downward, due to a twisting of the leaf, is wrinkled, drawing the 

 leaf into a fold. When the winter leaves have been frozen, new 

 mines are made in the spring. Larva grayish, first thoracic 

 segment with two indistinct brownish dorsal stripes, each ending 

 in a black spot at the posterior margin of that segment. Pupa 

 not enclosed in a cocoon, but attached flat to the leaf, with head 

 upward; of the slender, elongate type, yellowish gray, not 

 shining chitinous; with low rounded tubercles on the sides of 

 the mesothorax, and small, rounded tubercles on the front of 

 the head. 



This species in its early stages may be distinguished from 

 E. orestella Bsk. which makes a similar mine on the same grass, 

 by the grayish color of the mine and larva and. by the different 

 character of the pupa. The imagoes are separated from 

 E. albicapitella Engel by the absence of white on the crown, the 

 peculiar markings of the palpi and the duller white of the wing 

 markings. 



Elachista irrorata n. sp. 



Head dark gray, densely speckled with black; palpi black beneath, 

 gray above; antennte black. Thorax and fore wings dark gray, so 

 densely speckled with black that the general aspect is nearly black; a 

 narrow irregularly indented white fascia just beyond one-third the wing 

 length; just beyond apical third, an oblique white streak reaching the 

 middle of the wing, and opposite it a small white dorsal spot. Cilia 

 dark gray, almost black, with a black line of scales at the base. Hind 

 wings gray, densely and evenly irrorated with black; cilia grayish black. 

 Legs blackish with the tips of segments and a rather broad band near 

 the base of the hind tibiae white. Abdomen dark gray above, becoming 

 pale gray toward median line beneath. Expanse 8.2 mm. 



Type ( 9 ) reared from a larva mining a leaf of Agrostis 

 perennans, Hazelwood, Ohio; imago July 22. Most of the 

 parenchyma in the leaf-blade was consumed, leaving it yellow- 

 ish and curled. Pupa attached to leaf with a few irregularly 

 placed strands of silk, of the slender elongate type, very similar 



