COLEOPTERA OF BAJA CALIFORNIA. 425 



Argoporis inconstans n. sp. 



Piceous black, rather dull, legs red. Head finely punc 

 tate, clypeus truncate. Thorax a little wider than long, 

 slightly narrowed at base, sides feebly arcuate, hind an- 

 gles distinct, disc slightly flat, surface very finely sparsely 

 punctulate, sometimes very indistinctly. El^^tra oblong, 

 widest at middle, humeri slightly prominent, surface va- 

 riable in sculpture either subcostate as in costipoin/'s or 

 quite smooth as in aliitacea. Prosternum beneath opaque, 

 obsoletely punctate. Meso- andmetapleuree coarsely punc- 

 tate. Abdomen finely punctate, longitudinally wrinkled. 

 Length, .45-. 53 inch; 11. 5-13. 5 mm. 



Variations. — The extreme form has the elytra striate 

 with moderately coarse punctures, intervals convex and 

 near apex costiform. This form is known from San 

 Diego and San Esteban. 



The other extreme has the ordinary series of striate 

 punctures, the intervals flat, not costiform at apex. San 

 Jose del Cabo. 



A specimen intermediate is known from San Francis- 

 quito. 



Male. — Very like cbcnina. The tubercle on the first 

 ventral is triplicate. 



Female. — As in ebenina. 



There may be trouble in separating the extreme varia- 

 tions in the female — one form from costipemiis, the other 

 from alutacea — but in these latter the clypeus is always 

 arcuate and not truncate. 



San Diego, Cal. San Esteban, San Francisquito and 

 San Jose del Cabo. 



Cerenopus aterrimus n. sp. Plate vii, fig. 10, hind 

 leg of male. 



Form of concolor, but a little more slender, black, feebly 

 shining. Head sparsely finely punctate, clypeus emargi- 



