368 MEMOIRS ON THE COLEOPTERA 



the base almost rectilinearly transverse, rounding at the sides, three- 

 fourths the maximum width; sides coarsely reflexed, rounded, rather 

 straighter basally, the angles broadly rounded; surface with the 

 ruguliform lines rather distinct, the transverse impressions unusually 

 pronounced; concavity formed by the united foveae deep, rather 

 broadly rounded, the bottom subrugose and punctured as usual, 

 but differing from the stygica type in having an isolated central 

 convexity, everywhere widely separated from the sides and ends of 

 the concavity; carina strong though obtuse, not very close to the 

 sides; elytra three-fourths longer than wide, somewhat posteriorly 

 inflated, a third to two-fifths wider than the prothorax, the sinus 

 distinct; striae deep, the punctulation very fine; intervals very con- 

 vex. Length (cf 9 ) 14.5-15.0 mm.; width 5.0-5.35 mm. Rhode 

 Island (Boston Neck) umbonata n. sp. 



Body more parallel than in any of the three preceding, very nearly as in 

 flebilis Lee., deep black, shining; head slightly elongate, with mod- 

 erate but prominent eyes, three-fifths as wide as the ( prothorax; 

 palpi pale, very slender, the fourth joint much shorter than the third; 

 antennae extending a little behind the thoracic base, ferruginous, pice- 

 ous basally, the outer joints on the narrow side very slender basally 

 and very feebly dilated apically; prothorax larger than in any of the 

 three preceding, being barely visibly narrower than the elytra, just 

 visibly wider than long, widest slightly before the middle, the sides 

 subevenly rounded and coarsely reflexed to the very obtuse and 

 blunt, though evident, basal angles; base about equal in width to 

 the deeply sinuate apex and four-fifths the maximum width; foveae 

 rugose, deep, coalescent posteriorly, the separating surface feebly 

 convex; carina rather short and not very high; elytra three-fourths 

 longer than wide, subevenly rounded behind, parallel, with very 

 feebly arcuate sides; striae deep, the punctulation along the bottom 

 minute, the scutellar free at tip; intervals strongly convex; tarsi 

 ferruginous. Length (cf ) 15.0-15.5 mm.; width 5.2 mm. Indiana. 

 Levette collection subaequalis n. sp. 



8 Thoracic foveal cavity moderately deep, its rugosely punctate floor 

 nearly flat 9 



Thoracic foveal cavity very deep and concave 10 



9 Body rather stout, strongly convex, deep black and polished; head 

 well developed, the eyes prominent; sulci broadly and deeply im- 

 pressed, slightly converging; antennae rather long; prothorax nearly 

 a fourth wider than long; base sometimes not quite as wide as the 

 apex, which is rather deeply sinuate; sides rounded anteriorly, more 

 oblique but still distinctly arcuate basally, very coarsely reflexed; 

 angles very obtuse and rounded; transverse impressions feeble but 

 evident, the stria deep, entire; foveal depression a fourth the total 

 length and more than a fourth the width; carina long and strong, 

 approaching close to the edge basally; elytra feebly subposteriorly 

 inflated, two-thirds longer than wide, a fourth wider than the pro- 

 thorax; striae very deep, vestigially punctulate, the intervals con- 

 spicuously convex; subapical sinus very feeble. Length (cf 9 ) 14- 

 -17.0 mm.; width 5.0-6.0 mm. Lake Superior to Lake Champlain 



