92 PROCEEDINGS OF THE ACADEMY OF 



Bb. Scutellnm not carinate. 



Ca. Elytra entire. muticus. 

 Cb. Elytra serrate at apex. 



Da. Elytra with pubescent spots. Couesii. 



Bb. Head deeply sulcate. pitlchellus. 



Dc. Head plane, elytra cupreous. obolinus. 



A. fuscipennis, Gory, Lee. 



Elytra hardly denticulate at the apex, % with the abdomen 

 simple, prosternum very hairj^, thorax with the hind angles not 

 carinate, scutellnm not carinate. 



A. arcuatus (Say), Lee. 



Prosternum sinuate in front, scutellnm not carinate. I liave not 

 seen the male. 



A. ruficollis (Fab.), Lee. 



Ver}' like the preceding, but distinct by the carinate thoracic 

 angles, and the dorsal carina of the abdomen, which is acute and 

 prominent ; the male has a channel on the 2d segment ; pros- 

 ternum not hairy. 



A. torquatus, Lee. 



% abdomen not impressed, prosternum hairy. 



A. fulgens, Lee. 



% 1st segment slightl}^ imi)resscd at its apex, prosternum 

 hairy. 



A. obliquus, Lee. 



This is founded on a single 9 , which I am disposed to refer to 

 A. fulgena. 



A. otiosus (Say), Lee. 



% with segments 1-2 impressed, prosternum pilose, front 

 opaque green, pilose. A. geminatus. Say, belongs here, from his 

 description. 



A. defectus, Lee. 



This is founded on rather large females of A. otiosus. 

 A. pusillus, Lee. 



Founded on one female specimen which I cannot separate from 

 A. otiosus. 



A. diflficilis, Gory, Lee. 



Elytra faintly bicostate ; prosternum triangularly emarginatc 



