174 NORTH AMERICAN 



reticulate, while in the female it is highly polished and strongly and 

 sparsely punctate. 



A. aeiieogaster L. et G. — Mon. Anth. p. 32. — Form rather narrow and 

 elongate; sides parallel. Color very obscure and dull blackish-bronze above, 

 aeneous beneath ; elytra much less strongly asperate and more feebly undu- 

 lated ; pronotnm widest far behind the middle, more than twice as wide as 

 long ; sides broadly arcuate, not at all sinuate behind the middle. luter- 

 coxal process of the prosternum narrower, lateral terminal teeth broad and 

 rather short, very acute at apex ; apical tooth very long and conspicuous, 

 sides nearly parallel, leaving a large cavity in the mesosternum unfilled ; 

 sides of the latter parallel. Antennae much shorter and more robust, first 

 two joints very feebly reticulate, second nearly one-half longer than wide, 

 much shorter than the third, the latter distinctly longer than the fourth, 

 fourth but slightly more than on<'-half longer than wide ; maxillary palpi 

 long, second joint but very slightly longer than the third, the latter dis- 

 tinctly longer than wide, fourth joint very long and slender, nearly as long 

 as the second and third together. Length 5.5-tj.O mm. ; width 2.1-2.2 mm. 



Arizona (Morrison), 4. 



This species is very distinct, and, as the prothorax seems to resem- 

 ble that figured for ceneogaster by Laporte and Gory, I have ciioseii 

 this name for it. The expression employed in its descriijtion "d'un 

 noir pourpre tres-fonce," seems to strengthen this conclusion. 



A. naniila n. sp. — Form rather narrow; sides parallel. Color above 

 dull bronze, beneath metallic greenish ; elytra finely and very strongly 

 asperate, rather feebly undulated ; prouotum very slightly more than twice 

 as wide as long, sides rather strongly rounded, widest a little before the 

 middle, sides thence nearly parallel for a short distance. Prosternal inter- 

 coxal process rather wide, more coarsely reticulate, more deeply emarginate 

 at the sides, lateral terminal teeth narrower, longer and more pronounced, 

 very acute at apex where there is, as usual, a distinct callosity, general form 

 of the teeth that of an equilateral triangle ; apical tooth scarcely longer than 

 the lateral, narrow, acuminate at tip, nearly filling the entire cavity of the 

 mesosternum ; the latter rounded behind as in stritjata. Antennae long and 

 slender, two basal joints rather strongly reticulate, second distinctly longer 

 than wide, but slightly shorter than the third, the latter about as long as 

 the fourth, fourth about one-third longer than wide, remaining joints more 

 strongly serrate than in the preceding species ; maxillary palpi moderate, 

 second joint much longer than the third, the latter scarcely longer than 

 wide, fourth rather short and robust, much shorter than the two preceding 

 together. Length 4.2-5.0 mm. ; width 1.6-1.9 mm. 



California, G. 



Easily distinguished by its small size, narrow form, and pronotum 

 widest before the middle. 



