ment. Tuhercles l)roa(I, flat, somewhat convex, same color as hody, 

 each heaving a seta (certain ones 2 setae), arranged in s^'veral 

 longitudinal rows; one tuhcrcle per segment on each side of hody. 

 They ar(> to he designated as follows: those on the dorsum are 

 anterior trapezoidal (i) and posterior trapezoidal (ii), near the 

 anterior and posterior margins respectively of segments 5-12*, the 

 former are nearer the median line, on segments 8 and 4 each of 

 these tuhc-rcles is douhle, i. e., has two setae, and ii is situated 

 ventrally from i, instead of posterior to it; stjpra-spiracular (iii), 

 a tuhentle situated just ahove each spiracle, also one in a nearly 

 corresponding position on segments 3 and 4; sub-spiracolar 

 (iv + v), a douljle tuhcrcle just helow each spiracle, it is com- 

 posed of two united and hears two setae, on segments ■) and 4 it 

 is in front of iii, on segment 2 it is in front of the spiracU- (pre- 

 spiracular) ; lateral (vi), a tuhcrcle a little Indow iv + v and 

 situated a little farther I)ack; marginal (vii), situated on outer 

 side of each proleg, and on inner side of each true leg, and on 

 legless segments a little ventral from vi, each has three setae; 

 ventral (viii) a small tuhcrcle near median ventral line of each 

 segment. Cervical shield same color as hody, lias two hlack spots 

 near each lateral margin, the anterior spot the largei', sometimes 

 the lateral margin is faintlj^ hlack. On segment 3, tuhcrcle ii is 

 more or less hlack-margined on its lower and anterior sides, 

 making a conspicuous lilack spot in line with those on cervical 

 shield. Feet same color as body; spiracles yellowisli-hrown, 

 those of segments 2 and 12 larger than the others. 



The recently' hatched larva feeds in the folded togetlier tip of a 

 grass leaf which it has fastened with silk. It eats the surface of 

 the leaf in spots, leaving the under epidermis, which gives the 

 appearance' of dead spots on the leaf (Plate I, fig. 11); as it 

 hecomes larger it folds the leaf together lower down, doing this 

 from time to time as it needs to enlarge its retreat, or have access 

 to a fresh portion of leaf for feeding. In ahout two wet'ks the 

 larva has grown to a length of 15 mm., and now eats the whole 

 substance of the leaf, not leaving the epidermis as before. 

 Having used up one leaf, the larva migrates to another, l)y spin- 

 ning, rolls a portion of it into a tul)e (Plate I, Hg. 10), within 



* In numbering segments, the head is 1, prothorax 2, and the others 

 in succession. 



