296 Memoirs on the Coleoptera 



angles, which are obtuse though very sharply defined; base transverse, 

 arcuate at each side, two-fifths wider than the distinctly sinuate apex; 

 surface with moderate but deep, well separated punctures, gradually 

 close toward base, the transverse impressions obsolete, the stria fine and 

 short; foveae deep, impressed, acute at the bottom, distant from the 

 base and near outer fourth; elytra three-fifths longer than wide, two- 

 fifths wider than the prothorax, parallel, with the arcuate sides only 

 gradually more rounded basally, the subapical sinus rather short and 

 distinct; striae moderately fine, deeply incised, rather distantly and dis- 

 tinctly punctured basally, gradually impunctate posteriorly; intervals 

 almost flat, minutely, not very densely punctulate, the hairs rather fine, 

 gray; anterior male tarsi well dilated basally. Length (cf 9 ) 10.5— 

 12.0 mm.; width 4.6-4.7 mm. California (southern) and Arizona. Six 

 examples. 



Allied to tricolor Dej., but shorter in build, the head more elongate 

 and with less prominent eyes; it differs principally, however, in 

 the structure of the anterior male tarsi, the basal joint in tricolor 

 being longer than wide, the third narrow and distinctly elongate, 

 while in jacinto the first three joints are more broadly dilated, the 

 first very nearly as wide as long, the third subquadrate. 



The following two species may be placed in the group typified 

 by pennsylvanicus and brevilabris: 



Chlgenius sedulus n. sp. — Narrow and elongate, moderately convex, 

 the head and pronotum shining aeneous-green, the elytra rather dull, 

 olivaceous-green; under surface rather shining, distinctly punctate 

 throughout, black, the legs rufous; head four-sevenths as wide as the 

 prothorax, with prominent eyes, the surface minutely, feebly sculptured 

 and creased, impunctate, the anterior impressions small, punctiform; 

 palpi slender, pale, the third joint subequal to the fourth; antennae 

 slender, black, the first three joints testaceous; prothorax a fourth wider 

 than long, widest near the middle, the sides arcuate, more converging 

 anteriad, straight and feebly oblique posteriad to the slightly more than 

 right angles having scarcely blunt apices; fine reflexed margins rufous, 

 still finer and black at apex; base slightly oblique at each side, much 

 wider than the feebly sinuate apex; transverse impressions obsolete; 

 stria fine, short, within a rather wide impression; foveae short, fine, deep, 

 linear, lying within a broad depression and distant from the base; punc- 

 tures rather coarse, deep and close-set, somewhat less close subcentrally, 

 except near the stria; elytra two-thirds longer than wide, two-fifths 

 wider than the prothorax, the sides rather gradually rounded at base and 

 evenly so to the thoracic angles, gradually rounded behind, the sinus 

 rather short and distinct; striae rather fine, feebly incised, finely punc- 

 tured, smooth posteriorly; intervals flat, finely, not densely punctulate, 

 the hairs moderate; anterior male tarsi moderately dilated, the first 

 joint slightly oblique, as long as wide, the second slightly asymmetric 

 and a little wider than long, the third subquadrate. Length (d^) 10.8 

 mm.; width 4.3 mm. Texas (Amarillo), — H. L. Shantz. 



