THE PsELAPHID OF NoRTH AMERICA. 243 
and one-half wider than the head, widest behind the anterior 
third where the sides are acutely rounded and toward the 
neck and the base nearly straight; disk moderately convex, 
near the base with an angulated transverse sulcus, ending on 
the sides in an ample impression, containing a small fovea. 
£lytra across the shoulders as wide as the prothorax, widest 
behind the middle, where it is one-half wider and along the 
suture one-third longer than the shoulder-width; disk rather 
depressed near the base, sutural lines slightly impressed, basal 
fovez small, the sutural ones near a transverse elevation of 
the base, the discal ones in the anterior part of a shallow 
oblong depression, below the humeral ridge a fovea con- 
nected by an oblique line with the lateral margin. Abdomen 
as wide as the elytra, slightly convex, without the basal 
impressions, segments subequal, border narrow. The pubes- 
cence of the elytra and the dorsal segment arranged in regu- 
lar rows. Anterior coxe contiguous, posterior ones distant, 
trochanters short triangular, legs slender, anterior femora 
crenate below, tarsi with one claw, second joint twice as long 
as the third, metasternum not impressed. ¢ anterior tibiz 
arcuate with a deep notch inside on the distal fourth of its 
length, clypeus with a medial ridge. 9 tibiz and clypeus 
simple. 
Habitat. Alameda county, California. 
This singular insect unites some of the characters of 
Bythinus (Macherodes) carinatus and Pselaphus longipalpus, 
the antenne and the palpi belonging to the European 
Macherites group of the Bythin7, the form of the head 
approaching that of Pse/aphus. According to the testimony 
of Dr. David Sharp, there is no genus known, with which it 
can be united. 
PsELapuus, Abst. (yniaddv, I feel my way—referring to the 
very long maxillary palpi.) 
Head longer than broad, eyes large, prominent. Prothorax 
as long as the head, barrel-shaped, polished, nearly twice as 
long as thick. Elytra conjointly forming nearly an equilateral 
