NATURAL SCIENCES OP PHILADELPHIA. 325 



Variation F. 

 The first ochreous saffron band interrupted in the middle, with a broad in- 

 ternal margin of scattered scales, produced behind in the middle ; the second 

 somewhat diffuse, with the irrorated portion of the wing spreading out behind 

 from the produced part of its black-margin. 



Variation GL 



With an angulated line of blackish scales before the first band and an ochre- 

 ous saffron patch between its angle and that of the black-margin of the first 

 band. 



The larva mines the upper side of the leaves of oaks in July. The head is 

 black, the body pale yellowish, with an ochre yellow patch on the dorsum of 

 the eighth segment, a dark vascular line and a few dark subdorsal spots pos- 

 teriorly. The imago appears early in August. The variations F and G were 

 specimens found in the pupa state. 



16. L. argentinotella . Antennae silvery. Front and tuft silvery. 

 Thorax pale reddish saffron, with a rather short, unmarginal, silvery basal 

 streak, with Jive costal silvery streaks and/our dorsal streaks of the same hue. 

 The first costal and dorsal streaks unmargined, the first dorsal being near the 

 inner angle of the base, tapering to a point in the middle of the wing from a 

 very broad base ; the first costal streak rather slender and only one-half as 

 long as the first dorsal ; the second costal and second dorsal connected about 

 the middle of the wing, and dark-margined toward the base by a line much 

 curved in the middle ; the third costal and third dorsal opposite, and each 

 dark-margined internally ; the fourth dorsal about midway between the fourth 

 and fifth costal streaks ; sometimes the fourth costal and dorsal streaks with 

 a few dark internal scales, sometimes unmargined. At the apex is a small 

 patch of scattered black scales ; the hinder-marginal line rather indistinct, 

 cilia saffron, paler on inner margin. Hind wings shining silver gray, cilia 

 rather darker. 



I am unable to give any account of this species. The specimens were un- 

 marked by any number referring to my notes, and I suppose I must have 

 mistaken it for some other, as I did not observe its peculiar markings until I 

 came to write the present paper. I hope, however, to supply its larval history 

 next season, now that the species thus far met with are tabulated in a manner 

 which will facilitate recognition. 



The following genus belongs, in the arrangement of European systematists, 

 to the family Elachistidae. I do not think any argument necessary to prove 

 that it is a natural portion of Lithocolletidse, which is usually regarded as be- 

 ing composed of a single genus. 



Tischeria Zeller. 



Head with a rather erect frontal tuft of scales ; the front smooth, narrow 

 and but little inclined. Oeelli none. Eyes rather salient, naked and not 

 covered with scales in front. Antennae scarcely more than one-half so long 

 as the anterior wing, with rather long pilose dilations beneath in the (j\ simple 

 in the $, with the basal joint tufted in front. Maxillary palpi very short and 

 scarcely perceptible. Labial palpi short, filiform and drooping. Tongue scaled, 

 as long as the anterior coxa?. 



The wings with long cilia ; the anterior pointed almost caudate, the poste- 

 rior lanceolate. The discoidal cell of the anterior not pointed, closed in front 

 by a very faint nervure, and with . a faintly indicated secondary cell, beyond 

 which the subcostal nervure is almost obsolete. The subcostal nervure sends 

 four veins to the costa, the first of which is rather long and arises near the 

 basal third of the wing ; the discal emits a simple vein to the costa above the 

 tip and one to the inner margin beneath. The median nervure send two veins 

 to the inner margin near the tip. The submedian is simple. 



1859.] 



