40 DESCRIPTIONS OF NEW SPECIES. 



slender, with the outer joints not thicker. The terminal ventral 

 segments both above and below are inclined to become testaceous 

 at the hind margins ; the 6th ventral is emargiuate, as in P. litho- 

 charinus. 



134. P. opacus. Depressns, opacus piceus, vel rufo-piceus, capite 

 ovato, postice truncate fortius punctato, vitta dorsali laevi, thorace piceo- 

 ferrugineo, latitudine paulo longiore, postice angustato, confertim sat 

 fortiter punctato, vitta dorsali laevi, elytris thorace Laud longioribus, 

 abdomineque confertissime punctulatis et subtiliter pubescentibus. 

 Long. -27 -30. 



San Diego, under sea-weed. This species resembles in form 

 P. lithocharinus, but is less slender, and the head is scarcely 

 wider than the thorax. The antennae are as long as the head and 

 thorax, and slender. The body is sometimes reddish-brown, with 

 only the elytra and abdomen darker. The sexual characters are 

 as in P. lithocharinus. 



135. I*, decipiens. Elongatus, piceus vel piceo-rufus, capite obscuro, 

 ovali .postice truncate, grosse punctato, vitta media lata laevi, thorace 

 latitudine paulo longiore, postice subangustato, haud dense punctato, 

 vitta dorsali .laevi, elytris opacis, thorace longioribus, abdomineque con- 

 fertim punctulatis, et pubescentibus. Long. *20. 



San Diego, under sea-weed. The antennae are stout, and nearly 

 as long as the head and thorax. The punctures of the thorax 

 are not closely set, and tend to form rows. 



Sexual characters as in the preceding species, but the 6th ven- 

 tral segment of the male is less deeply emarginate. 



136. P. Slllcicollis. Elongatus depressus, ater, capite magno, basi 

 etnarginato, grosse punctato, vitta lata laevi, thorace latitudine longiore, 

 postice sensim angnstato, parce subseriatim punctato, vitta dorsali laevi 

 paulo elevato, sulco punctigero definita, elytris thorace longioribus ab- 

 domineque confertissime punctatis et griseo-pubescentibus, pedibus ob- 

 scure testaceis. Long. -25. 



San Diego, under sea-weed. Resembles closely P. bistriatus 

 Er. of the Atlantic coast, and differs principally by the head 

 being larger and flatter in the male, and the antenna somewhat 

 shorter. 



137. P. coiiferf us. Nigro-aeneus, pube minus subtili griseo-cinerea 

 vestitus, capite ovali, fortius punctato, plaga rhomboidea laevi nitido, 



