386 Goleopterological Notices, VII. 



habits also it is more purely myrmecophilous than most other 

 North American species of the tribe, though even here we may 

 have cause to doubt the completeness of the symbiosis. 



The head Is large and truncate at base, but is borne on a 

 strongly constricted and exserted neck, the antennal cavities 

 widely separated on the declivous front, with the intermediate 

 surface not modified, the clypeus short but abruptly subporrect,. 

 so that there is a strong reentrant angle in profile between 

 the front and plane of the clypeus, the apex of the latter even. 

 Labrum large, transverse. Mandibles relatively very small, the 

 maxillae and palpi more than usually developed, the second joint 

 of the maxillary palpi slender, moderately clavate and slightly 

 bent at apex, the third long, rather abruptly and strongly clavate 

 in apical half, the basal half forming a long and very slender 

 peduncle ; fourth joint slender and aciculate. In most of its re- 

 maining characters the single known species might be regarded 

 as an aberrant Euconnus ; it may be described as follows : — 



1. P. rasus Lee— Proc. Acad. Nat. Sci., Phila., 1852, p. 153 (Scyd- 

 msenus) . 



Stout, polished and impunctate, pale rufo-testaceous through- 

 out ; body completely glabrous, with the exceptions noted below. 

 Head large, subquadrangular, much wider than long, glabrous,^ 

 except a brush of dense coarse pale hairs at each side of the basal 

 surface of the occiput near the neck, the latter ^ as wide as the 

 head ; eyes small, rounded, anterior and not prominent. An- 

 tennae rather thick, with a somewhat abrupt and moniliform 4- 

 jointed club, nearly ^ as long as the body; joints two to seven 

 cylindric and verj^ closely connected, the second a little thicker 

 and slightly elongate; three to six equal in width ; third, fourth 

 and sixth subequal and not quite as long as wide ; fifth rather 

 longer than wide ; seventh but just visibly wider, feebly obconic 

 and a little longer than wide; joints of cliib much more loosel}'^ 

 connected ; eighth |- wider than the seventh, oval and a little 

 longer than wide ; ninth and tenth i wider, a little wider than 

 long, narrowed apically, the apex narrowly truncate ; eleventh 

 rather thicker, very obtusely ogival and slightly oblique at apex, 

 much shorter than the two preceding. Prothorax rather small,, 

 about as long as wide, not quite as wide as the head ; sides paral- 

 lel in basal half, convergent apically ; surface completely glabrous 

 except a few short hairs on the flanks anteriorly near the head^ 



