1S64.] 
425 
ELACHISTA. 
Cosmiotes. Proc. Acad. Nat. Sei., Jan. 1860, p. 9. Ib. May, 1860, p. 172. 
Elachista Brachyelytrifoliella. —Fore wings dark grayish brown from the 
base to the middle of the wing and thence to the tip, blackish brown between 
the markings. The costa at the base is white and connected with the white 
costa, about the basal third of the wing, is a short, oblique silvery white costal 
streak. Near the apical third of the wing, is another conspicuous, silvery-white 
oblique costal streak, nearly meeting in the middle of the wing a dorsal streak 
of the same hue. In the costal cilia, just above the tip, are two minute silvery 
white streaks, black margined internally. Beneath the tip, the wing is slightly 
varied with pale grayish. Hind wings grayish brown, cilia the same. 
Antennse grayish-brown. Head in front, and labial palpi silvery white. 
The larva mines the leaf of Bi'acliyelijtrum aristatum early in July. 
The mine at this period is a blotch, taking up most of the leaf, but the 
beginning is a threadlike line. My specimens were taken on the 9th 
of July, at which time the most of the mines I found were tenantless, 
and two of the larvae were young. On the 12th of July one of the 
larvae left its mine to prepare for pupation; this it did by weaving a 
slight web in which the larva attached its anal prolegs, with the head 
downward. The larva that spun up on the 12th, appeared as an imago 
on the 25th of July. 
Easton, Pennsylvania. 
ADELA, Lat. 
Hind wings oblong-ovate, with moderate cilia. The subcostal vein 
is simple, attenuated towards the base. The discoidal cell is closed by 
a doubly angulated vein which throws from the upper angle a discal 
branch, furcate near the extremity and anastomoses with a false ner- 
vule in the middle of the disc. The median vein is 3-branched, the 
upper branch being medio-discal and closes the lower portion of the 
disc. Submedian and internal veins distinct. 
Fore wings oblong. The subcostal vein gives origin to four margi¬ 
nal branches, the first arising near the base of the wing and forms a 
secondary cell. (In the species described below, Ridlngsella^ the third 
marginal branch is furcate.) Two discal branches are delivered to the 
hinder margin from the discal vein. The median vein is 3-branched. 
The submedian furcate at its base. 
Head rough, with hairlike scales } face beneath rather smooth. Ocelli 
none. Bj/es remote in both sexes. Antennae twice as long as the fore 
