COLEOPTERA OF BAJA CALIFORNIA. 315 



elono-ate or scratchy punctures, except at apex and along 

 the lateral margin. 



In its facies this species superficially resembles our 

 Dytiscits fasciventris, but beneath is entirely dark chest- 

 nut brown. Occurs in the Antilles, San Domingo, 

 Demerara, South America, Guatemala. Cabo San Lucas 

 and San Jose del Cabo. 



Cybister ellipticus Lee. Southern California, 

 Yuma and vicinity. Cabo San Lucas (fide Ulke.) 



gyrinid^. 



DiNEUTES suBLiNEATUs Aube. Texas, Arizona, Mex- 

 ico from Coahuila to Nicaragua. Cabo San Lucas. 



Gyrinus plicifer Lee. Middle California, southward 

 to Arizona. La Chuparosa. 



Gyrinus parous Lee. Oklahoma, Texas, Mexico to 

 Nicaragua. La Chuparosa. 



HYDROPHILID^E. 



Helophorus obscurus Lee. Oregon and California 

 southward. San Pedro Martir. 



Epimetopus costatus Lee. Texas. San Jose del 

 Cabo. 



Ochthebius interruptus Lee. V^ancouver, Colorado, 

 Arizona. Comondu. 



Hydrophilus insularis Cast. Texas, southern CaH- 

 fornia, Mexico, Guatemala, Yucatan, Antilles. 



It is possible that triangulai'is Say and atcr Fab. may 

 occur in the peninsula. 



Tropisternus limbalis Lee. Oregon, California, 

 Utah, Arizona. Cabo San Lucas. 



