242 NATURAL History BULLETIN. 
gined. Venter flattened along the middle, anterior trochan- 
ters with a hair-like spine contiguous to the surface of the 
femur. Legs moderately strong, tibie nearly straight. No 
reliable sexual marks have been discovered in any species of 
this genus. 
Habitat. Mississippi Valley, south of $6" 
PsELAPTRICHUS, Brendel. 
Antennal insertions approximate, front prolonged narrow, 
sulcate. Maxillary palpus very long, the second joint sigmoid- 
clavate and coarsely tuberculate, the third small quadrate, the 
fourth broadly securiform, as long as the second with short 
erect pubescence. 
P. TUBERCULIPALPUS, Brendel. Yellowish brown, pubes- 
cence in regular rows, form slender, slightly convex. Length, 
r.00 ram. He late VIT., Five. 24. . 
Head flat above, longer than wide, widest between the eyes, 
which are small and situated at the angles of a pentagon form- 
ing the discus of the vertex posterior to the oblong frontal 
prolongation; the latter nearly quadrate, arcuate in front, 
sulcate in the middle, the lateral half with the suface plane 
and inclined toward the sulcus; just before the eye-line are 
two small fovea, mutually twice as distant as either from the 
eye and connected by a straight angular shallow sulcus with 
the frontal fissure; occiput slightly elevated with a fine carina 
in the middle, labrum small transverse, clypeus anteriorly 
trisinuate; antennal cavities large, from the middle of the 
eyes to the middle of the posterior limit of the antennal cavi- 
ties a fine carina, and between those cavities a narrow frontal 
septum. Antenne as long as the head and prothorax con- 
joined, first joint cono-cylindrical, half as long as the head, 
second oval, as wide as the first, third and seventh less than 
half as wide as the preceding joints, globular, eighth wider, 
not longer, ninth transversly oval, tenth twice as wide as long, 
eleventh oval, twice as wide as the second joint and one-half 
longer, with long pubescence. Prothorax as long as wide, 
