NATURAL SCIENCES OF PHILADELPHIA. 163 



opposite on the inner margin, and a whitish spot at the tip. Cilia brownish 

 gray. Hind wings dark fuscous-gray, cilia fuscous. Feet annulated with 

 white. 



Fore wings scarcely pointed. Hind loings slightly emarginate beneath the tip, 

 with an intercostal cell at the base. 



G. Rhoifructella . Head, face and thorax grayish-fuscous. Labial 

 palpi rather dark ochreous. Antenna ochreous, annulated with black. Fore 

 wings grayish-fuscous dusted with dark brown, and with four dark fuscous 

 dots, one near the base of the fold, two near the middle of the wing, (one on 

 the fold and one above it, ) and one on the end of the disk. Near the end of 

 the wing is an indistinct grayish band. Hind wings fuscous, cilia the same. 



The larvae may be found in April or early in May, in the fruit spikes of sumach 

 (Rhus Typhina), where they feed on the crimson hairs and exterior envelope 

 of the drupes, without however eating the drupes themselves. The larvae are 

 concealed in galleries formed in the fruit spikes, and their presence is indicated 

 by strings of "frass" clinging to the exterior. The cocoon is a slight silken 

 web woven amongst the "frass" near the surface. The larva is immaculate, 

 and varies in color, from dark reddish-brown to a pale brown, dotted with 

 rows of darker colored dots, each giving rise to a hair ; the head is brown and 

 the shield blackish. The imago appears about the middle of June. 



Size small. Fore wings rather lanceolate and pointed. Hind wings deeply 

 emarginate beneath the tip, which is produced. The second joint of labial palpi 

 somewhat thickened. 



G.? rubidella . Head and face ochreous. Labial palpi yellowish white, 

 with two deep fuscous spots on the middle joint, and two blackish brown rings 

 on the terminal one, a narrow one near its base and a broad one near the tip, 

 while the tip is blackish. Antennae deep fuscous annulated with white. 

 Thorax fuscous, deep fuscous in front. Fore wings roseate, dusted with deep 

 fuscous, with a brownish ochreous streak along the inner margin from the 

 base to nearly the middle of the wing, and interrupted about its middle by a 

 roseate hue. At the basal third of the wing is an oblique deep fuscous band, ex- 

 tending from the costa to the fold, and beyond the middle of the costa is a 

 spot of the same hue, joined toward the inner margin by a brownish- 

 ochreous spot. The apical portion of the wing much dusted with deep fus- 

 cous ; cilia ochreous, with a fuscous hinder marginal line. Hind wings black- 

 ish gray ; cilia somewhat paler. Feet rather pale ochreous, spotted with deep 

 fuscous. 



G. flexurella. Head and face grayish fuscous. Labial palpi, second 

 joint dark fuscous, terminal joint white with a blackish ring at the base and 

 one near the tip. Antennae whitish annulated with dark fuscous. Fore 

 wings grayish fuscous, with a pale grayish band near the apex margined in- 

 ternally on the costa by a blackish brown spot, with another of the same hue 

 about the middle of costa and another on the costa near the base. Near the 

 base of the fold is a rather faint dark brownish spot, and the wing is sprinkled 

 with dark brown atoms. Hind wings dark fuscous, cilia ochreous gray. 



Variety ? Fore wings smoky fuscous, with a pale grayish band near the 

 tip, broadest and most distinct on the costa, margined broadly internally across 

 the wing, with dark brown, with a pale grayish spot between it and a dark 

 brown spot on the middle of costa. In the middle of the wing are two dark 

 brown spots, one on the basal part of the fold and a small one on the costa 

 above it of the same hue. Hind wings dark fuscous. 



G. mimella. Head and face tawny brown. Labial palpi, second joint 

 dark fuscous, with a whitish ring at its end ; third joint gray with a ring in 

 its middle. Antennae pale fuscous annulated with white. Fore wings tawny 

 brown, with an ochreous band near the tip, margined internally slightly with 

 I860.] 



