338 ' Histeridcs in San Diego County. [zoE 



fossularis; mandibles rather strongly curved and shorter. Length 

 17.5 mm. Rare. Found in decaying Echhiocadus viridescens, 



HoLOLEPTA CACTI Lec Very abundant in decaying cacti, fre- 

 quently taken from beneath the bark of decaying and water-soaked 

 wood of the willow. Mentum concave, with strongly elevated lines; 

 prosternum narrowed and almost acute at tip. 



HoLOLEPTA viciNA Lcc. Common from July to November. 

 Found in the decaying fruit of Cucurbita. Mentum concave with- 

 out elevated lines; prosternum slightly narrowed, truncate, and 

 slightly emarginate at tip. 



HoLOLEPTA NEGLECTA sp. nov. Narrower and more elongate 

 than vicijia. Mentum feebly concave, lines rudimentary; pros- 

 ternum slightly narrowed, subtruncate. Sides of prothorax quite 

 evenly arcuate. Sides of body moderately arcuate.- Length 7 

 mm. Found in decaying squashes. Rare. This species was identi- 

 fied for me as lucida, but is entirely different in habitat from 

 specimens subsequently obtained of that species. 



HoLOLKPTA POPULNEA Lcc. Taken from decaying cacti in the 

 eastern or desert portion of the county; common in Arizona. 



HiSTER SELLATUS Lec. Not couimon; in spring and early sum- 

 mer observed flying about sandy places near streams, ^ilso found 

 about the roots of plants. Elytra are marked with red. 



HiSTER SEXSTRIATUS Lec. Commou; observed flying about on 

 warm days in spring, also found at the roots of grasses and beneath 

 bark in rotten wood ; a large black 'species. 



HiSTER MiLiTARis Horn. In some seasons quite common. Fre- 

 quents the sandy banks of streams, and beneath debris in same local- 

 ity. Smaller species with each elytron marked with a red line. 



Tribalister marginellus Lec. Rare; taken from beneath 

 rocks in moist places. 



Tribalus californicus Horn. A very small species and abun- 

 dant beneath bark, rocks, etc., in permanently moist places. I once 

 observed some six or eight individuals feeding upon a living Mela- 

 notus longidus. 



Paromalus opunti/E Lec. Common; found in decaying fruit of 

 species of Cticurbita, leaves and stalks of Opn?itia occidentalis. 



