244 Natural History Bulletin. 



triangle with the anterior angle but Httle truncate; abdomen 

 with the first dorsal as broad as the tip of the elytra, and half 

 as long, the sides parallel, broadly margined. The other seg- 

 ment is short and retractile. Legs long, antennas 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. ERiCHSOXii, Lcc. Red or reddish-brown, polished, not 

 punctured. Length, 1.75 mm. Plate VII., Fig. 23. 



Head 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. Prothorax twice as long as thick, 

 with a nearly imperceptible puncture near the base. Elytra 

 depressed, flat, dorsal lines sharp, entire, base angulate toward 

 the suture, the shoulders closely adjoining the base of the pro- 

 thorax. Sutural strias 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. Abdomen depressed at base, convex from 

 side to side, broadly margined, the other segments together 

 shorter than the first, declivous and very retractile. AntcnncR 

 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, tibia? dilated in the lower half, 

 tarsi with the second joint dilated. 

 Habitat. Eastern States. 



P. LONGiCLAVus, Lec. Blackish -brown elytra blood -red, 



