NATURAL SCIENCES OF PHILADELPHIA. 101 



37. Hind angles of thorax slightly obtuse, not rounded ; (tibiae and tarsi 

 ferruginous.) Lake Superior , 25. in noc u u s Zee. 



Thorax strongly transverse ; 



Hind angles of thorax obtuse ; scarcely rounded at tip ; base punctured ; 



40. Sides of thorax less strongly rounded ; (elytra of female without sutu- 

 ral spine.) Saskatchewan . 26. carbonatus Lee. 



39 -46. Sides of thorax more strongly rounded ; (elytra of female with 

 distinct sutural spine.) Lake Superior ........27. rufimanus Lee. 



56. Hind angles of thorax obtuse, rounded at tip ; base scarcely punctured. 

 Colorado Terr 28. mo nt an us n. sp. 



52 -58 Hind angles of thorax flattened, rectangular not rounded ; base 

 sparsely punctulate. Lake Superior ......29. Lewisiin. sp. 



ff Head very large, scarcely narrower than the thorax. 



48 -60. Sides of thorax distinctly depressed. Lake Superior. 



30. la tic e p s Lee. 

 56, Sides of thorax not depressed. Illinois 31. viduus n. sp. 



D. Elytra very slightly sinuate at tip, (except in 39 ,) abdomen with accessory 

 ambulatorial setae, proceeding from distinct punctures. 



a. Mentum tooth more or less distinct. 



* Elytra with dorsal puncture; antennae concolorous, reddish Crown, 

 f Mentum tooth very small; (larger species of dark color, with the 



elytra reticulate in both sexes.) 



Base of thorax smooth, or scarcely punctulate ; sides slightly 



depressed. 

 58 '64. Body oblong oval ; elytra of female with sutural spine. Oregon. 



32. fraternus Lee. 

 46. Body oblong oval ; sutural spine of female obsolete. Kansas. 



33. funestus Lee. 

 48 -54. Body broader ; thorax slightly narrowed behind ; elytra of fe- 

 male with sutural spine. New Mexico and Colorado 34. oblitusi/ec. 



Sides of thorax not depressed ; feet ferruginous. 



40. Hind angles obtuse, slightly rounded ; base nearly smooth. Colorado. 



35. fu rti vu s n. sp. 



45. Hind angles subrectangular, slightly rounded at tip ; base of thorax 



punctulate. Nebraska 36. s tup i du s Lee. 



ff Mentum tooth large, prominent ; smaller species of brown color/paler 



beneath ; elytra of male smooth ; of female scarcely reticulate. 

 30. Sides of thorax not depressed. New Mexico, Kansas. 



37. desertus Lee. 

 30. Sides of thorax depressed, base punctured. Kansas. 



38. lucidus . sp. ufU 

 ** Elytra with dorsal puncture, tip much more distinctly sinuate; 



antennae paler at base. 

 36. Body broad, hind angles of thorax scarcely rounded; sides slightly de- 

 pressed. Oregon, Idaho, Winnepeg 39. b e s u 1 us Lee. (***<u 



*** Elytra without dorsal puncture ; antennae paler at base. 



35. Thorax not narrowed behind, sides ;< not depressed. Lake Superior, 

 Canada 40. varicornis Lee. 



b. Mentum tooth entirely wanting ; elytra not reticulated ; hind angles 



of thorax rectangular. 



* Elytra without dorsal puncture. 



42. Body uniformly testaceous, oblong oval. Iowa, Illinois. 



41. testaceus Lee. 

 1865.] 7* 



