212 PROCEEDINGS OF THE ACADEMY OP 



M. tentoriferella . Labial palpi pale yellowish ; basal half of the 

 second joint blackish or dark fuscous. Fore wings reddish ochreous, with 

 dispersed dark fuscous atoms. The extreme base of the costa is blackish, 

 from a small black spot on its edge ; with three blackish brown spots arranged 

 in a triangle in the middle of the wing, one about the middle of the disk, 

 another on its end, and one in the fold beneath them ; cilia rather long and 

 russet colored. Hind wings rufo-fuscous, along the discal portion of costa, 

 pale ochreous. 



The larva tapers posteriorly from the head ; terminal legs short, placed 

 posteriorly, projecting beyond the shield ; abdominal legs short ; with papili- 

 form points in squares, each bearing a hair ; body cylindric and sub-monili- 

 form. The head is large, carried horizontally ; somewhat flattened above, but 

 rounded ; cervical shield doubtfully indicated, its color dark green. Body 

 dark green, at first uniform, but after the last moult, a double yellowish - 

 green dorsal line is added. 



It may be found during the latter part of July, on the leaves of wild cherry, 

 oaks and hickories. On the underside of the leaf it throws a closely woven 

 sheet or web from the midrib to the side of the leaf, and draws it into a shallow 

 fold. This sheet or tent is not much longer than the larva itself, open at both 

 ends, transparent, shining and vitreous. Beneath this it rests during the 

 day, and in the night leaves it to feed on the edges of the leaf, retreating to 

 its cover if alarmed. To this it clings most tenaciously if disturbed, thrust- 

 ing its head from beneath it, shaking it from side to side, or if disturbed in 

 front, retreats, without leaving it, and defends itself stoutly with its mandi- 

 bles. Its length is about half an inch. When it leaves a leaf to form 

 a new tent on another, it always devours the silk of the one it deserts. 



During the latter part of August or first of September it enters the pupa 

 state and forms its cocoon, by turning down a portion of a leaf, carpeting it 

 with silk and binding its edges closely. The opening left at the ends, corres- 

 ponding to the tail of the pupa, is closed densely, and the other with loose 

 silken threads. The pupa case is very dark reddish brown, and it remains in 

 situ when the imago escapes. The antennae-cases as long as the wing-cases ; 

 abdomen rather short and blunt; cylindrico-conical. The imago appears 

 during the latter part of September. 



Psilocorsis. 



The neuration of the wings differs in scarcely any respect from the foregoing 

 genus, except that the medio-posterior vein is not remote from the penultimate. 

 The posterior veins of the median are very much curved. The structure of 

 the fore wings in both these groups is much like that in the Tortrices. 



Head smooth. Face rounded. Ocelli none. Eyes large, round and salient. 



Labial palpi long, remote from the face, recurved, rather slender ; second 

 joint rather flattened, smooth, with appressed scales ; third smooth, slender and 

 pointed, nearly as long as the second joint. Maxillary palpi short, distinct. 

 Antennae about one half as long as the fore wings, simple and filiform ; basal 

 joint rather long and subclavate. Tongue one-half as long as thorax beneath, 

 scaled. 



P. quercicella . Head and thorax dark yellowish-brown. Labial palpi, 

 second joint ochreous, with a black line on the edge beneath; third black, 

 with two yellowish white stripes in front. Antennae ochreous, with a black 

 line above, terminating in black spots ; basal joint with two black stripes in 

 front. Fore wings yellowish brown, varied with blackish irregular striae, 

 chiefly from the costa, with a black dot on the end of the disk. The posterior 

 margin is tipped with blackish ; the cilia are yellowish brown, containing two 

 dark fuscous hinder marginal lines. Posterior wings pale ochreous, cilia the 

 same. 



The larva tapers from the third segment anteriorly and posteriorly : flattened 



[June 



