WILLOW LEAF-MINERS. 579 



50. Gracilaria larva. 



Associated with the foregoiug species and Oracilaria purpurielltty 

 August 20, at Brunswick, Me. It fastens two leaves together, lining 

 the cavity thus formed with white silk. It also turns a whole leaf over, 

 inside out, joining the edges together com}»letely, and making a long 

 irregular pod-like tube. 



Larva. — Much like that of Gracilaria piirpiiriella, hut the segments are fuller, with 

 distinct piliferous warts which are concolorous with the body, the latter being uni- 

 formly yellowish green. Head small, much narrower than the prothoracic segment, 

 pale yellowish amber, with a small dark dot on each side; prothoracic segment con- 

 colorous with the other segment, but with two brown dots, one on each side. Length, 



51. LithocoUetis salicifoliella Clem. 



" During the latter part of June or early in July the leaves of the 

 yellow willow, Salix vitellina var. alha^ should be searched for this in- 

 sect. The mine is on the under surface, usually near the base of the 

 leaf and along the edge. I found these mines for the first time on the 

 23d of July of the present year, but they were untenanted, and the 

 imagos had escaped, so that I am unable to furnish any further par- 

 ticulars respecting the species." (Clemens.) 



52. LithocoUetis sp. 



The larva of this minute moth is abundant on the willow. It was 

 observed July 10, and probably is to be found by the end of June. 

 The leaf is folded and rolled inward from near the base to the outer 

 third, and the larva eats holes in parts adjacent on the other side of 

 the mid-rib and on the inside of its case. The moth emerges as early 

 as July 20, leaving the pupa case sticking part way out of the folded 

 leaf. July 10 we found the larva of a small Braconid ? larva which had 

 spun a loose silken cocoon, closing the opening of the fold. 



Larva. — Body pale green ; head rounded, jet-black, as wide as the body. Segments 

 of the body coarsely wrinkled transversely. On the three last segments of the hind 

 body are black spots forming two irregular transverse conspicuous lines, and at the 

 end are four black pointed tubercles or spines. Length, 6™™. 



53. Cemiostoma albella Chambers. 



The larva) of this Tineid are said by Chambers to live in large black- 

 ish blotch mines. 



54. Aspidisca saliciella Clera. 



" From the beginning to the middle of July the larva may be taken 

 on the leaves of yellow willow. The mine is very small, the excised 

 portion, with which the disk is formed, taking up the greater portion 

 of it. 1 noticed in this larva a habit, which may be generic, but if so it 



