148 Trans. Acad. Sci. of St. Louis. 



sinuation at each side of the median tooth broader and feebler; an- 

 tennae, gular sutures and palpi similar; ligula densely fimbriate at 

 tip with about six stout membranous spicules; necls scarcely more 

 than a third as wide as the head; prothorax subquadrate; presternum 

 rather short; elytra large and well developed; abdomen narrower, the 

 segments narrowly and feebly impressed at base; legs slender, the an- 

 teiior tarsi not dilated, the posterior slender and shorter, the first joint 

 only slightly longer than the second, equal to the fifth, the first four 

 decreasing uniformly in length. Cosmopolitan. [— Metaxyodonta Csy.l;. 



Lithochaiis 



The known species of these genera are comparatively few 

 in number. 



Aderocharis Shp. 



This genus is rather well represented in Mexico by several 

 species, but only one occurs widely distributed within our 

 territories as follows : — 



Body broad, parallel, only very moderately convex, dark red-brown in 

 color throughout, the head black or blackish; surface throughout 

 rendered very dull in lustre by fine, densely placed bnt not con- 

 flueut punctures, which are granuliform on the elytra; head not quite 

 t:S*Iong as wide, parallel, the sides feebly arcuate, the angles rather 

 nairowly rounded; eyes at nearly twice their length from the base; 

 antennae scarcely as long as the head and prothorax, the latter not 

 quite as wide as the head, slightly wider than long, with the sides dis- 

 tinctly converging from the very distinct apical, to the broadly rounded 

 basal, angles, and straight; median impunctate line yery fine but entire; 

 elytra quadrate, parallel, a fourth wider and longer than the prothorax; 

 abdomen parallel, nearly as wide as the elytra. Male with the fifth 

 ventral just visibly sinuate toward the middle of the apex, the sixth 

 broad, aa^gularly emarginate throughout its entire width at apex, the 

 emargination some seven times as wide as deep, with the angle only 

 slightly rounded; seventh unusually developed, finely, longitudinally 

 siit beneath nearly throughout its length ; female with the sixth ven- 

 tral rather narrowly and strongly rounded at tip. Length 6.5 mm. ; 

 width 1.3 mm. Pennsylvania, Virginia, North Carolina (Asheville), 



and Iowa corticina Grav. 



This species is moderately abundant and displays little or 



no variability. 



Liithocliaris Lac. 



The species of this genus are but few in number, and, in 

 several instances, cosmopolitan in distribution, being probably 



