1863.] 
128 
Fore wings narrow ; discal end narrow. The apical branch of the 
subcostal vein is furcate and enters the costa behind the tip, and behind 
it are three subcosto-marginal branches. The posterior branch of the 
median is furcate. Submedian furcate at the base. 
Head smooth. Ocelli none (?). , Antennae setaceous, remotely den¬ 
ticulated in the S , microscopically ciliated. Labial palpi with the 
second joint beneath formed like a brush, with the hairs lyroduced in 
front; the terminal joint smooth, pointed, recurved' and needlelike. 
Maxillary palpi not perceptible. Tongue of moderate length, clothed 
with scales. 
The labial palpi in the images I refer to this genus, are not so much 
like a brush as are those of Y. pareiitheselhis of Europe, for a specimen 
of which I am indebted to Mr. H. T. Stanton of London. In our spe¬ 
cies the second joint of the palpi has not the long brushlike hairs along 
its under surface, but are arranged almost into a tuft at the end of the 
joint. 
The species described by I)r. Fitch, under the generic name of Ghal- 
tochilus, belong to this genus. I have been unable to recognize any 
of the following in his descriptions. 
Y. piinctidiscellus.— Wings narrotv. Fore wings pale ochreous, dusted and 
brown ; along the costa towards the base paler, rather whitish. At the base of 
the fold is a brown dot, two of the same hue about the middle of the wing, and 
one or two, likewise brown, at about the end of the disc. Near the tip is an 
indistinct yellowish line, with a brown band exterior to it. The hinder mar¬ 
gin has a series of blackish dots at the base of the cilia. Cilia similar in color 
to that of the fore wings. Hind wings somewhat plumbeous gray. 
Antennse annulated with pale yellowish-brown and deep brown. Head pale 
yellowish brown. Labial palpi, second joint dark fuscous, pale ochreous at the 
end; terminal joint pale ochreous. 
Y. pauciguttellus. —Fore wings rather dull, uniform earthen brown, irregu¬ 
larly and sparsely dotted with dark brown. Cilia concolorous with the wing. 
Hind wings brownish, with a bluish irridescent hue. 
Antennse dark brownish, not annulated. Head dark brownish. Labial palpi, 
second joint dark brown, whitish at the end; terminal joint dark brownish, 
striped internally with whitish. 
Y. unicipunctellus. — Wings rather broa.d. Fore wings pale brownish-ochreous, 
with a purplish hue, slightly dusted with blackish. In the fold about the mid¬ 
dle is rather an indistinct blackish dot, and one of the same hue in the middle 
of the wing about the end of the,disc, with two or three white scales on its interior 
margin. Around the hinder margin is a series of blackish dots. Cilia uncolor¬ 
less with the fore wings. Hind wings brownish. 
Antennse annulated with yellowish and brown. Head brownish-ochreous. 
