COLEOPTERA OF BAJA CALIFORNIA. 371 



vals uniseriately punctulate flat at middle, convex at sides 

 and apex. Body beneath piceous black, slightly bronzed, 

 punctuation rather coarse in the thoracic regions. Ab- 

 domen rather finely and closely punctate, less closely on 

 the first two segments, at sides with moderately long, 

 sparse, whitish hair. Prosternum in front trisinuate, a 

 mammiliform elevation each side limiting the points of 

 sinuation. Last ventral with a slight ridge within the 

 apical margin. Length, .31 inch; 8 mm. 



This species belongs to the group in which the anterior 

 edge of the prothorax beneath is trisinuate and with a 

 distinct tubercle each side. It must be associated with 

 those species in which the thorax is not wider than the 

 elytra, having the lateral margin inferior and without 3^el- 

 low spot at the side. 



It mav be known from any species in the group, and, 

 in fact, from any in our fauna, by the cylindrical and 

 convex form and the red marginal spot one-third from 

 the apex. 



San Jose del Cabo. A specimen from Tucson, Ariz. 

 (Wickham, 231), has a small red spot between the hu- 

 merus and the larger spot. 



ACM^ODERA BIVULNERA n. sp. 



Closely resembling stiginata or cult a in form, color dark 

 blue beneath, elytra bluish or slightly greenish with a 

 moderately large red spot, one-third from apex, head and 

 thorax piceous slightly bronzed, surface moderately shin- 

 ing. Front convex, moderately closely punctate, sparsely 

 pubescent. Thorax about one-half wider than long, 

 sides gradually, arcuately narrowed to the apex, disc 

 convex without depressions, a slight fovea at base on 

 each side, surface rather sparsely and finely punctate at 

 middle, gradually more coarsely and closely at the side, 

 pubescence short and sparse. Elytra slightly wider 



