32 CALIFORNIA ACADEMY OF SCIENCES. 



Stout, backward directed median tubercles or spines in 

 front of the middle of the mesothorax and a still shorter 

 one each side of them at the anterior marjjin. Meta- 

 thorax with a deep median depression, the upper edges 

 quite acute, terminating anteriorly in a small tooth-like 

 projection, Metathoracic spines rather long and slender, 

 curved backward and outward. 



First node of petiole triangular from a lateral view, its 

 two dorsal and the lateral faces quite flat, the edges 

 acute ; the upper edges are provided anteriorly with two 

 short, stout teeth, and laterally with two to three smaller 

 denticles each side; there is also a forward directed, 

 acute ventral tooth at base. Second node wider than 

 long, rounded in front and at sides, truncate behind, con- 

 cave above, the edges acute and beset with four or live 

 short, acute teeth ; there is also a prominent lateral carina, 

 furnished with four or five teeth, and two ventral teeth. 



Abdomen of the normal shape, the first segment with 

 a depressed median line, and each lateral half with about 

 twenty-five teeth, some of them bifid, arranged in irregu- 

 lar rows. The other segments without teeth or tubercles. 



Head, pro- and mesothorax rugoso-granulate ; the 

 metathorax, legs, nodes and abdomen densely and finely 

 granulate. Erect pubescence stiff and blackish, the 

 appressed pubescence yellowish. 



Two $ . Taken at Calamujuet. 



This appears to be related to A. coronata Fab., which 

 differs from this species in the comparatively smoother 

 surface of every part of the body, the longer mandibles 

 and antenna?, more numerous and longer denticles of the 

 heady much longer spines of the thorax, lower anterior 

 node and larger and more flattened posterior node of the 

 petiole. 



