INSECTS OF THE POISON IVY. 665 



2. Chrysocorya erythriella Clem.* 

 Order Lepidoptera ; family Tineid^. 



The larva feeds on the fruit racemes of sumach. 



"Frass" scarlet. The cocoon was woven on the outside of the 

 racemes. It was ovoid and appeared to consist of coarse silk and but 

 a single thread, being woven so as to leav^e large meshes, enabling one 

 to see the pupa through it distinctly. At maturity the pupa case is 

 thrust forth. The pupa is pale green, with the head-case distinctly 

 separated from the case of the thorax. The length of the larva is 

 about two lines, of the pupa about one and a half. 



Larva. — It tapers anteriorly and posteriorly, incisures deep, segments elevated in 

 the middle with a single row of transversely arranged epidermis joints on each ring, 

 each one giving rise (o one or two rather stiff hairs ; abdominal legs very slender and 

 short, terminal placed posteriorly. Head with a few hairs, ellipsoidal, pointed, rather 

 small, and pale brown. The body is uniform dark green. 



Moth, — Head, face, and thorax fuscous, with a greenish-brassy hue. Labial palpi 

 ocherous, terminal joint fuscous. Antennae bronzy-yellowish fuscous. Forewiugs 

 reddish-fuscous, with a greenish-brassy hue ; cilia fuscous. Hind wings reddish- 

 fuscous, cilia the same. 



3. Sumach leaf-roller. 



This leaf-roller rolls the leaves from the tip a quarter to a half way 

 to the stalk, or it ties the leaves together in various ways; and some- 

 times simply turns over the edge of a single leaf. Before pupating it 

 makes a long, slender spindle-shaped delicate thin cocoon. 



Larva, — Congeneric with the smaller larva on the sycamore; thoracic feet pale yel- 

 low like the body, with two lateral conspicuous black prothoracic spots. 



4. Datana perspicxia G. and R. 



This notodontian has been bred from the sumach in New York City 

 by S. Lowell Elliot. 



INSECTS INJURIOUS TO THE POISON IVY. 



Rhus toxicodendron. 



Lithocolletis guttifinitella Clem. 



The larva may be taken in August and September in the leaf of Rhus 

 toxicodendron (Poison Oak), mining the upper surface in a rather broad, 

 tortuous track, and there are ordinarily several in the same leaf. The 

 larva belongs to the second larval group. The cocoon is circular, 

 formed within the mine as usual in this group in a little circular 

 depression. (Clemens.) 



Larva. — The head is a fine pale brown ; the body yellowish posteriorly, becoming 

 brownish above, with a dorsal and ventral dark macula. 



* Of this I received two specimens from Dr. Clemens ; it is closely allied to our 

 C. festaliella. The exp. al. is 4^—5 lines. H. T. Stainton. 



