412 CALIFORNIA ACADEMY OF SCIENCES. 



Trimytis obtusa n. sp. 



Oblong, piceous black, moderately glossy. Antenna 

 pale. Head densely and somewhat strigosely punctate, 

 middle lobe of epistome obtusely triangular. Thorax 

 about twice as wide at middle as long, sides regularly 

 arcuate, base and apex nearly equal, the angles obtuse, 

 moderately coarsely and closely punctate, somewhat stri- 

 gose at the sides. Elytra slightly wider at base than the 

 thorax, with striae of tine punctures not closely placed, 

 intervals irregularly biseriately punctate, the punctures of 

 the stria? and intervals confused behind the scutellum. 

 Pro- and mesosternum very coarsely punctured, the pro- 

 pleuree strigose. Abdomen moderately coarsely not closely 

 punctate. Legs slightly brownish. Length, .15 — .18 

 inch; 4—4.5 mm. 



Occurs at Sierra Laguna. 



There are now three species of Trimytis known to me, 

 which may be separated in the following manner: 



Thorax distinctly wider at base than at apex, hind angles rectangular, an- 

 terior angles prominent to the front. 

 Middle lobe of epistome s<£narely truncate, front very little strigose at 

 the sides; thoracic pnnctnatiou not coarse nor dense; surface mod- 

 erateljr shining. pruinosa. 



Middle lobe of epistome semicircnlai", front closely strigose; thoracic 

 punctuation rather coarse and close; surface subopaque. 



pulverea. 

 Thorax scarcely perceptibly wider at base than at apex, hind angles obtuse, 

 anterior angles not produced. 

 Middle lobe of front obtusely triangular, front not truly strigose but 

 with coarse punctures longitudinally confluent; thoracic punctua- 

 tion moderatelj' coarse and close; surface moderately shining, less 

 on the head and thorax. obtufia. 



From an examination of a typical specimen of Pcsccn- 

 niiis vi//os/is Champion, from Mexico, shows that it does 

 not differ from Trimytis in structural characters beyond 

 the fact that the surface is hairy. 



