196 MEMOIRS ON THE COLEOPTERA 



sculpture, the transverse carina even, not attaining the sides by a 

 long distance and without trace of median sinus; oblique sides of the 

 clypeus deeply sinuate, the teeth notably small, not very acute; 

 prothorax nearly as in the preceding but with the punctures smaller 

 and more unevenly distributed, becoming very sparse basally as a 

 rule and remote toward the sides; anterior pit generally small and 

 feeble, the tubercle obtuse; scutellum smooth, with a central fovea 

 in all examples at hand; elytra short, barely at all longer than wide, 

 rather more than twice as long as the prothorax, much more ( 9 ) 

 and nearly a fourth wider, broadly and obtusely rounded at apex; 

 sculpture as in the preceding but everywhere less coarse and feebler; 

 pygidium feebly and finely soabriculate, except in a large medial 

 and apical region, where it becomes smooth and with small and very 

 sparse punctures; hind tibiae notably slender as in gibbosus. Length 

 (2 cf , 2 9 ) 12.8-13.4 mm.; width 7.7-8.5 mm. New Jersey. 



breviusculus n. sp. 



A Similar to brei>iusculus in the fine sculpture but relatively more 

 elongate, dull in lustre, castaneous above, not paler but more 

 blackish beneath and throughout the legs; head still smaller, about 

 a third as wide as the prothorax, similar, except that the clypeal 

 teeth are larger; prothorax similar, but with the punctures every- 

 where sparser; scutellum without the central fovea in the type but 

 with a conspicuous scabrous-punctulate line at some distance 

 from the margins and parallel thereto, which is only very feebly 

 and fragmentarily indicated in breviuscidus; elytra longer, less 

 inflated behind and less exceeding the prothorax in width, other- 

 wise similar; pygidium distinctly differing, being much more 

 extendedly and conspicuously scabriculate, the smoother medial 

 part with the punctures stronger and irregularly more close-set; 

 hind tibiae nearly similar. Length (cf 1 ) 13.7 mm.; width 7.9 mm. 



Northern Illinois (Highland Park) lacustris n. subsp. 



Body very broadly and almost evenly oval, convex, not very shining, 

 dark umber-brown above, obscure castaneous beneath; head but 

 little more than a third as wide as the prothorax, nearly as in gib- 

 bosus but with the clypeal teeth relatively more separated, the ridge 

 and teeth much worn down in the type; prothorax three-fourths 

 wider than long, differing visibly from all the preceding species in 

 having the sides strongly converging from base to apex and strongly, 

 almost evenly arcuate; basal angles rather broadly rounded from 

 above; base broadly but evidently lobed medially; punctures re- 

 latively small, moderately sparse, largely wanting medio-laterad 

 and, toward the median line, becoming decidedly minute; anterior 

 pit small and feeble, the tubercle obtuse; scutellum nearly smooth; 

 elytra barely longer than wide, parallel, with evenly arcuate and not 

 post-medially inflated sides, more than a fourth wider than the 

 prothorax and slightly more than twice as long, broadly rounded at 

 apex; punctures rather coarse, the series evidently impressed, with 

 rather close-set punctures, the sculpture on the whole as in gibbosus 

 but not quite so conspicuously coarse; pygidium much broader and 

 relatively shorter, with the median line broadly and deeply impressed, 



