36 Memoirs on the Coleoptera 



Form still less ventricose, smaller in size and narrower, polished black, 

 the elytra and femora just visibly picescent; head slightly elongate, 

 rhomboidal, more than three-fourths as wide as the prothorax, the 

 eyes moderate but prominent; antenna scarcely half as long as the 

 body, slender, piceous-black, the third joint much longer than the 

 fourth; prothorax not quite a fourth wider than long, the sides 

 parallel, evenly and distinctly arcuate, becoming gradually just 

 visibly sinuate basally, the angles slightly more than right, with 

 well defined and sharply prominent tips; base as wide as the moder- 

 ately sinuate apex, only just visibly oblique laterally; apical angles 

 very blunt; margins broadly and strongly refiexed, especially 

 toward base, and faintly diaphanous, the broad gutter more or less 

 punctulate throughout; foveae large, concave, indefinitely limited 

 and rugose, the outer wall formed by the refiexed edge; near the 

 inner limit of the foveae and far before the base there is a small and 

 abruptly very deep rounded impression; anterior impression angu- 

 late, deep, the posterior feeble; elytra hardly one-half longer than 

 wide, barely two-thirds wider than the prothorax, the sides gradually 

 a little more rounded at base; subapical sinus long and very distinct; 

 strise strong, deeply impressed, with fine but distinct punctures 

 along the bottom; intervals strongly convex laterally and apically, 

 rather less so elsewhere, the three punctures deep and distinct; tarsi 

 slender, with deep lateral furrow. Length (9) 9-0 mm.; width 



3.5 mm. Idaho (Coeur d'Alene), — Wickham aleneanus n. sp. 



13 — Species moderately large, somewhat as in brunneomarginatus in 



point of size I4 



Species of small size and of the southern Mexican fauna, less than 7 mm. 



in length 26 



14 — Prothorax narrow and subcordiform but with the basal angles very 

 obtuse and rounded. Body rather convex, deep black and highly 

 polished throughout; head fully three-fourths as wide as the pro- 

 thorax, slightly elongate, with large and prominent eyes and short 

 broad anterior impressions; antennae slender, fully half as long as 

 the body, dark rufous, black basally, the paler joints blackish at 

 apex; prothorax barely a fifth wider than long, the sides inflated 

 and rounded anteriorly, oblique posteriorly, becoming just visibly 

 subsinuate before the very obtuse angles, widely refiexed, becoming 

 the outer wall of the very large deep smooth basal foveae; base 

 strongly arcuate laterally, distinctly narrower than the feebly 

 sinuate apex, the apical angles obtusely rounded; anterior im- 

 pression deep, the posterior fine but traceable; stria deep but only 

 between the impressions; elytra three-fifths longer than wide, 

 not quite twice as wide as the prothorax, rather obtuse at tip, 

 with the oblique sinus barely more than straight, the humeri mod- 

 erately rounded, the rather sinuate basal margin forming a very 

 rounded angle with the sides; striae deeply impressed, nearly smooth, 

 the intervals convex; dorsal punctures three, but with a fourth, 

 adventitious, on the left elytron of the specimen here described. 

 Length (cf) lo.o mm.; width 3.7 mm. Minnesota (Duluth). 

 [Platynus angusticollis Kirby nee. Dej.j stygicus Lee 



