222 THE CAXADIAX ENTOMOLOGIST. 



minute, ])lack, })ilifcrous spots, each of which gives rise to a single, short,, 

 fine hair. Venter of the thoracic segments and thoracic legs black ; pro- 

 legs and under surface of abdominal segments whitish. The change to- 

 pupa usually takes place within the larval case. Chr}salis slender, smooth, 

 bright reddish brown, except the head and wing sheaths, which are much 

 darker. Mr. Riley once brought me a leaf-folding larva on Hackberry, 

 which resembled these Ambrosia case-makers in every respect, but as I did 

 not succeed in obtaining the imago from it, I am unable to say whether or 

 not the insects were identical. 



In viy specimens of dubitella the purple-brown of the anterior Avings 

 is marked with four ochreous spots, instead of three^ as in Mr. 

 Chambers' description, and the hind Avings are more nearly gray than 

 fuscous. 



There is another leaf-folding larva of the same size and habit of D. 

 dubitella, wliich also feeds on Ambrosia artcjuisiiFfolia, and which is e\'en 

 more elegantly marked in black and white than the latter. This insect, 

 AA'hich I take to be a true Init undescribed Gelechia, I may, perhaps,, 

 describe in a future paper. I would respectfully propose for it the name 

 of Chambcrsdla. 



The lar\a of G. rubeusella is an external feeder on Oak. It inhabits a 

 thin web at the base or near the tip of the leaf, and skeletonizes the upper 

 surface of tlie latter. Its length is rather more than y% of an inch. In 

 form it is elongate and sub-cylindrical, tapering anteriorly and posteriorly 

 from the middle, and has the sutures deej). The color is grass green, 

 striped with numerous very fine longitudinal lines of purple, and ornamented 

 with two sub-dorsal rows of conspicuous ])urj)le spots, situated at the 

 sutures. Head horizontal, pale l)rown, pointed toward the jaws with two 

 irregular whitish dashes on each side. J^egs and jjrolegs pale green — the 

 latter very narrow. This pretty larva is as characteristic in its habits as in 

 its api)earance. It does not touch the leaf except when feeding, but 

 remains suspended in a sort of gallery of delicate web-work, through which 

 it moA'es with surprising rapidity. It changes to pupa within a frail 

 cocoon, on the surface of the ground. The chrysalis is pale brown, slender 

 and chiefly characterized by long, free wing sheaths. The moth issues in 

 about ten days. In its perfect state this insect bears so close a resemblance 

 to G. roseosujfu sella Clem., that it is difficult to distinguish it from the 

 latter. It is, however, as a rule, smaller, darker and more roseate, while 

 the lar\a is entirely different, that of G. roseosuffu sella mining the lea\'es 

 of Clover, and being much less strikingly marked. 



