226 CALIFORNIA ACADEMY OF SCIENCES. 



little convergent, hind angles rounded, base truncate. Thorax densely 

 punctate, a narrow, smooth, slightly elevated median line. Elytra more 

 finely and sparsely punctate, tips narrowly pale; abdomen very finely, 

 moderately densely punctate. 

 Length, 4 mm. 



Described from one male and two females taken at 

 Los Angeles and in Kern County. 



S. occiduus is allied to 8. quadriceps and S. opaculus by 

 the punctuation of the upper surface of the head; but 

 it is at once distinguished from these two species by the 

 sparse punctuation of the lower surface, which is nearly 

 as in S. angularis. In the male the fifth ventral segment 

 is toothed at the middle of the hind margin, and the 

 sixth is triangularly emarginate. 



30. Pseudopsis detrita, sp. nov. 



Piceous brown, legs and antennas paler, surface dull, sparsely pubes- 

 cent. Head three-fourths as wide as the prothorax, very finely punctulate, 

 scarcely evidently strigose; eyes moderate, tempora subequal in length to 

 the eyes. Antennae shorter than the head and prothorax; intermediate 

 joints submoniliform, outer joints gradually more transverse, the terminal 

 nearly as long as the two preceding united. Prothorax transverse, a little 

 narrower than the elytra, widest just behind the middle, sides nearly 

 evenly, moderately strongly rounded, not sinuate before the angles, which 

 are obtuse, the anterior less distinct; apex truncate; base arcuate, a little 

 sinuate within the angles; surface finely not closely punctate, the disk 

 with four obtuse and slightly elevated longitudinal lines; the two inter- 

 mediate obsolete toward the apex. Elytra scarcely as wide as long, a little 

 wider behind, sparsely but more distinctly punctate than the thorax; each 

 with two vague discal costse and a more distinct submarginal one. Abdo- 

 men more shining, distinctly punctate, the margin widely reflexed; first 

 four dorsal segments equal, and each with a broadly, anteriorly arcuate 

 impressed line from side to side; fifth segment as long as the two preced- 

 ing united. Ventral segments moderately closely and distinctly punctate; 

 the sixth in the male with a broad and deep subrectangular emargination, 

 the inner angles broadly rounded. 



Length, 2-2.2 mm. 



A rather common species in vegetable detritus along 

 the streams of the western slopes of the southern 



