396 CALIFORNIA ACADEMY OF SCIENCES. 



terminal spurs. Penultimate joint of tarsi alone spongy- 

 pubescent beneath, the claws toothed. 



The only difference between this genus and Oxacis is 

 in the form of the mandibles. The character is constant, 

 without variation and with no evidence of intermediate 

 forms. One of the Mexican forms recently described 

 by Mr. Champion in Oxacis seem to have similarly formed 

 mandibles (holosericea), and should be placed here. 



The species known to me are as follows: — 



Claws quadrangularly dilated at base; elytra pale testaceous with fuscous 



vittte. dorsalis. 



Claws sharply toothed. 



Pale testaceous; elytra vittate. pleurtdis. 



Brownish testaceous; elytra not vittate. floridana. 



Entirely piceous. nitidula. 



Alloxacis dorsalis Mels. (Nacerdes.) Proc. Phil. Acad., 

 1846, p. 55. 



Pale testaceous, thorax with a central, and elytra with 

 two variable fuscous vittte; surface finely pubescent. 

 Head sometimes with a fuscous cloud, finely and densely 

 punctured. Thorax as wide as long, sides feebly arcuate 

 at front angles, then oblique to base, disc with three faint 

 impressions, surface very finely and very densely punc- 

 tulate. Elytra less finely and less densely punctured than 

 the thorax, and with feeble costas. Body beneath very 

 finely and densely punctulate, finely pubescent. Legs 

 pale. Length .34— .48 inch.; 8.5-12 mm. 



The elytral vittas are variable in their extent and sharp- 

 ness of definition, but no specimens have occurred where 

 they are entirely obliterated. The antennas are slightly 

 distant at base from the eyes. 



Occurs on the sea coast of the eastern Atlantic region. 



Alloxacis pleuralis Lee. (Probosca) New Species, 1866, 

 p. 166. 



