COLEOPTERA. OF BAJA CALIFORNIA. 24I 



with few scattered punctures. Elytra as long as the 

 body, scabrous, sparsely pubescent. Length, .10 inch; 

 2.5 mm. 



Male. Last ventral large parallel, curved upward, 

 channeled its entire length, acutely notched at tip. Last 

 dorsal oval without processes. PI. xx, fig. 2. 



Allied most closely to curvatns Lee, but differs in the 

 male characters, its color and by the shorter third joint of 

 the antennge. 



One specimen. San Jose del Cabo. 



Mastinocerus opaculus n. sp. 



Slender, iuteous yellow, abdomen piceous the last two 

 segments yellow, surface very sparsely pubescent. Head 

 scabro-punctate, but indistinctly. Thorax similar in form 

 to that of texanus but less arcuately produced at apex, 

 surface opaque very finely granular, with sparsely placed 

 indistinct punctures. Elytra opaque, the disc very flat, 

 surface minutely scabrous. Venter shining, sparsely 

 punctate and pubescent. Length, .18 inch; 4.5 mm. 



Closely resembles texanus but is much smaller, the 

 dorsum more flat and the surface opaque without very 

 decided sculpture. 



Arizona, southern, but locality unknown. 



Mr. Gorham (Biol. Cent. Am., iii, pt. 2, p. 106) seems 

 to have the opinion that our species are not congeneric 

 with the Chilian form described by Solier. The antenna 

 of the latter are said to have the eleventh joint biramose. 

 While it is possible that such a character may be found, 

 all instances heretofore mentioned have been found erro- 

 neous on second examination. Mr. Gorham admits that 

 Cenophengus is related to Mastinocerus, because the sec- 

 ond and third joints of the antennae are short and without 

 rami. This is equally true of both the Mastinocerus of 

 our fauna. 



2d See., Vol. V. ( 16 ) July 19, 1895. 



