524 PROCEEDINGS OP THE ACADEMY OP 



A. Large species, witli the thorax punctured and the hind angles divergent ; 



the elytra costate, gradually widened behind, with the humeri distinct, 

 but rounded : 

 Thorax scarcely longer than wide ; sides much rounded in front : 



58. Antennas and abdomen not infuscated. Southern and Western States. 



tormentarius Lee. 

 61. Trunk blackish-brown ; middle of metathorax ferruginous ; antennae 

 with the 4th and following joints darker. Southern States. 



alternans Dej. 



61. Thorax considerably longer than wide, sides less rounded than in the 



preceding ; abdomen darker at the sides. Southern States. ?B. deyrollii 



Ferte. . . . . strenuus Lee. 



B. Moderate sized species ; elytra gradually widened behind, costate, with the 



humeri indistinct ; antenna? and abdomen dark. 

 45_.53. Thorax elongate, punctured, hind angles not prominent. ^ South- 

 ern States. Var. viridipennis Dej. ; viridis Lee. ; lecontei Lee. 



perplexus Dej. 



45. Thorax sparsely punctured, hind angles prominent. Southern and 

 Western States americanus Lee. 



C. Moderate, or rather large species ; elytra but slightly wider behind, costate, 



with the humeri distinct ; thorax sparsely and finely punctured, with 

 the hind angles prominent ; sides of abdomen a little darker : 



.45 .55. Thorax very wide in front, very suddenly narrowed behind. 

 Middle and Western States, as far as New Mexico. ballistarius Lee. 



.44 .50. Thorax more gradually narrowed behind. Found in the whole of 



the Atlantic district. cyanopterus Lee. ; var. sufflans Lee. ; perplexus Lee. ; 

 librator Dej. ; similis Lee fumansDe/. 



D. Smaller species ; elytra broad, wider behind, strongly costate, humeri dis- 



tinct ; thorax opake, rugose and punctured, hind angles slightly promi- 

 nent ; abdomen not infuscated. 



30. Thorax rather long; elytra glabrous, the grooves almost with single 

 series of punctures. California and Arizona. Var. lecontei Motsch. 



costipennis Motsch. 



35. Thorax shorter, sparselv punctured; elytra pubescent at the sides. 

 California. . . . \ . tschernikhii Mann. 



35. Thorax shorter, densely punctured; elytra punctulate, pubescent. 

 California and Arizona o a rinul at u s Motsch. 



E. Smaller species ; thorax usually sparsely punctured, not longer than wide, 



very strongly constricted behind ; elytra wider behind, convex, humeri 

 distinct. 

 a. Hind angles of thorax very prominent : 



40. Thorax rugous, almost opake ; elytra moderately costate ; beneath 

 dark ferruginous. New Mexico, Arizona and Lower California. 



f i d e 1 i s Lee. 

 40. Thorax scarcely rugous, sparsely and strongly punctured; elytra 

 strongly costate ; abdomen scarcely darker at the sides. Kansas. 



kansanus Lee. 

 32 -37. Thorax sparsely and finely punctured ; elytra scarcely costate ; 

 antennas and abdomen usually slightly infuscated. Middle, Western and 

 Southern States, conformist Lee. ; velox Lee. ; var. ?cephalotes Dej. 



cordicollis Dej. 



[Dec- 



