THE LEAF BEETLES. 



1117 



Haldeman, S. 8. — " Cryptoeephalinorum Borealis-Americse diag- 

 noses cum speciebus novis Musei Lecontiani, " in Journ. 

 Phil. Acad. Nat. Scl, I, 1849, 245-2G5. 



Suffrian, E. — "Monographic und Kritsches Verzeichniss der 

 Nordamerikanischen Cryptocephali, " in Linnea Entomlo- 

 gica VI, 1852, 198-318; VII, 1855, 1-238; XII, 1858, 343- 

 409. 



LeConte. — "Contributions to the Coleoptera of the United 

 States," in Trans. Amer. Ent. Soc, VIII, 1880, 195-209. 



KEY TO GENERA OF CEYPTOCEPHALINI. 



a. Tarsal claws simple ; larger, 3 or more mm. ; surface sculpture rougher. 

 J). Thorax uot margined hut crenulate at base; front femora not evi- 

 dently stouter than hind ones. 



c. Front edge of flank of thorax, beneath the antennae, toothed or 



sinuate. XIII. Bassareus. 



cc. Front edge of flanks of thorax straight. XIV. Cryptocephaeus. 

 &&. Thorax margined at base, not crenulate; front femora distinctly 

 stouter than hind ones. 



d. Presternum flat in front, depressed behind. XV. Griburii s. 

 dd. Presternum, feebly channeled; rows of punctures of elytra usually 



much confused. XVI. Pachybrachys. 



aa. Tarsal claws appendiculate, i. e., with a square dilatation at base; 

 smaller, less than 2.5 mm. (except in Monuclius) ; surface much 

 smoother. 



e. Prosternum wider than long; form robust, rounded; antennae stout, 

 rather short. XVII. Monachus. 



ee. Prosternum longer than wide; form more elongate, cylindrical or 

 oval. 



/. Antennal joints 6 to 11 wider ; form cylindrical. 



XVIII. Diachus. 

 //. Antennal joints 7 to 11 wider ; form oval, convex. 



XIX. Triachus. 



XIII. Bassareus Hald. 1849. (Gr., "a fox.") 



The members of this genus are separated from those of Cnjpto- 

 cephalus, which they most closely resemble, by the character given 

 in key. The males have the prosternum armed at middle with a 

 large, erect compressed process ; first ventral with a large flat plate 

 at middle, the hind angles of which rise into acute processes or 

 spines ; fifth ventral broadly concave, with a crest of curved erect 

 hairs each side of middle. Female with fovea of fifth ventral large, 

 deep and circular. The following species and varieties have been 

 taken or should occur in the State. 



