297 



rufous, with blackish femora; head nearly as in the preceding, the 

 longer and more slender antennae piceous, the three basal joints and 

 nearly half of the fourth pale testaceous; prothorax less transverse, 

 two-fifths wider than long or less; apex three-fifths as wide as the 

 base, deeply sinuate, with prominent and well defined, apically very 

 narrowly blunt angles; surface nearly as in the preceding but with 

 still ^nore nearly obsolete foveae; elytra one-half longer than wide, 

 as wide as the prothorax, gradually ogival behind the middle; striae 

 fine, coarse and groove-like* posteriorly, the seventh very feeble, 

 the scutellar oblique, variable; lateral line of punctures not interrup- 

 ted ; intervals very nearly flat throughout the length. Length (cf 9 ) 

 6.7-7.8 mm.; width 2.8-3.4 mm - New York, Maryland and Vir- 

 ginia. [Am. anthracina Hald.] impuncticollis Say 



Body larger, less narrowly oval, with the subapical sinus of the elytra 

 more abruptly formed, deeper and more conspicuous; coloration 

 similar, except that the surface lustre, though shining, is not metallic 

 to any obvious degree; head a little larger, otherwise similar; pro- 

 thorax somewhat more elongate; elytra rather more obtuse behind, 

 the striation similar. Length (9) 8.5 mm.; width 3.8 mm. Mis- 

 sissippi (Vicksburg) difficilis Lee. 



5 Elytra very gradually narrowed behind and feebly, subevenly arcu- 

 ate from before the middle to the acute apex, the apical part of the 

 disk very gradually declivous. Elongate-oval, convex, rather shin- 

 ing, deep black, without metallic lustre above, greenish-metallic 

 beneath; legs dark rufous, the femora black; head almost half as 

 wide as the thoracic base, a little narrower than the apex as usual; 

 eyes moderately convex; antennae rather long, piceous-black, the 

 first three joints and base of the fourth bright testaceous; prothorax 

 widest at base, not quite one-half wider than long; apex three-fifths 

 as wide as the base, very deeply sinuate, with prominent angles; 

 sides only slightly more arcuate and converging anteriorly; surface 

 nearly smooth, the stria fine; foveae feeble, impunctate, the inner 

 linear, the outer oval, oblique; basal angles right, barely at all 

 blunt, the puncture a little nearer base than side; margins finely but 

 strongly reflexed; elytra slightly more than one-half longer than 

 wide, submedially just visibly wider than the prothorax, the sides 

 more gradually oblique and feebly arcuate posteriorly than in any 

 other species, the sinus rather shallow; striae fine, impunctate, only 

 a little coarser apically; intervals nearly flat throughout but feebly 

 convex near the apex. Length (9 ) 9.0 mm.; width 3.8 mm. New 



Mexico (Sta. Fe), Cockerell acuminata n. sp. 



Elytra more rapidly and less acutely rounding behind as in fallax, the 



apical declivity steeper 6 



6 Larger species, somewhat as in fallax 7 



Smaller species, seldom much over 7 mm. in length 8 



7 Form rather stout, oblong-oval, moderately convex and shining, the 

 elytra sericeous in the female, black, with feeble bronze or greenish 

 lustre, black beneath, the legs black throughout or partially piceous- 

 black; head slightly less than half as wide as the prothorax, narrower 

 than the thoracic apex, the eyes large and rather strongly convex; 



