244 NatTurRAL History BULLETIN. 
triangle.with the anterior angle but little truncate; abdomen 
with the first dorsal as broad as the tip of the elytra, and half 
as long, the sides parallel, broadly margined. Tle other seg- 
ment is short and retractile. Legs long, antenne more than 
half as long as the body, palpi with the second and fourth 
joints longer than the head, the first and third being small and 
globular. 
P. ERICHSONII, Lec. Red or reddish-brown, polished, not 
punctured. Length, 1.75 mm. Plate VII., Fig. 23. 
flead larger before the eyes, narrow, frontal tubercles 
oblong-quadrate, divided by a fine incision which is dilated 
behind into a deep sulcus running through an ample median 
groove to the occiput. On each side of the groove is a 
hollow, bladder-like organ, yellow in color, which commonly 
shrinks after death to a triangular form. Occiput narrowed 
to the width of the neck. Pvothorax twice as long as thick, 
with a nearly imperceptible puncture near the base. /ytra 
depressed, flat, dorsal lines sharp, entire, base angulate toward 
the suture, the shoulders closely adjoining the base of the pro- 
thorax. Sutural striz dilated behind the middle, deeply sunk 
below the general level. The posterior margin is declivous 
except on the outer angles, from which it is separated by a 
short oblique ridge. Addomen depressed at base, convex from 
side to side, broadly margined, the other segments together 
shorter than the first, declivous and very retractile. Antenne 
with the first joint three times as long as thick, cylindrical, 
second to eighth obconic, gradually smaller; ninth and tenth 
oblong, rounded, larger, the eleventh twice the length and 
thickness of the ninth, oblong-ovate, acute at the tip. Palpi 
with the last joint clavate from the distal fourth, the club 
covered with rasp-like teeth and ending in a terminal seta. 
Legs long, femora clavate, tibiz dilated in the lower half, 
tarsi with the second joint dilated. 
Habitat. Eastern States. 
P. LoncicLaAvus, Lec. Blackish - brown elytra blood-red, 
