158 MEMOIRS ON THE COLEOPTERA 



foveae at two-sevenths and at the middle. Length (9) 2.5 mm.; 

 width 0.85 mm. California (Booneville, Mendocino Co.). 



adolescens n. sp. 



5 Antennae notably thick and heavy. Body suboval and very convex, 

 deep black and polished; elytra with apex and external spot near api- 

 cal fourth, broadly joined to the apical area, pale, the pale areas 

 very nubilous; under surface black, the legs bright rufous; head five- 

 sixths as wide as the prothorax; sulci deeply impressed, straight, the 

 external anterior impression short as usual; antennae nearly as long 

 as the elytra, black, the basal joint obscure rufous, the medial joints 

 fully twice as long as wide; prothorax very convex, a third wider 

 than long, the base two-thirds the maximum width and much nar- 

 rower than the arcuato-truncate apex; sides evenly arcuate, be- 

 coming subparallel near the base, the angles sharp but more than 

 right; margins unusually finely reflexed; anterior impression very 

 feeble, the posterior distinct but obsolete medially; foveae very small, 

 elongate-oval, deep, the carina wholly wanting; elytra slightly over 

 one-half longer than wide, three-fifths wider than the prothorax, 

 parallel, with arcuate sides, gradually rounding at the humeri; striae 

 rather coarse, feebly impressed, obsolete on the declivity, the punc- 

 tures strong and relatively coarse, widely to moderately separated; 

 foveae before basal and near apical third. Length (9) 3.2 mm.; 



width 1.2 mm. Michigan (Marquette) umbraticum n. sp. 



Antennae slender, the thoracic margins less finely reflexed, the carina at 



the hind angles rather long, distinct 6 



6 Prothorax distinctly transverse 7 



Prothorax but feebly transverse, never more than a fourth wider than 



long II 



7 Head much narrower than the prothorax 8 



Head scarcely visibly narrower than the prothorax 9 



8 Body oblong-suboval, only moderately convex, polished, deep black; 

 elytra with the apices nubilously pale, but without obvious trace 

 of a posterior external spot; legs very nearly black, slightly piceous; 

 head three-fourths as wide as the prothorax, the eyes rather prom- 

 inent; sulci deep, the anterior external depression small, oval; an- 

 tennae only moderately slender as compared with all the following 

 species, black, barely less so at base, three-fourths as long as the 

 elytra, the medial joints scarcely twice as long as wide; prothorax 

 not quite one-half wider than long; apex rectilinearly truncate, much 

 wider than the base, the latter fully three-fourths the maximum 

 width; sides subevenly rounded and well reflexed to the parallel 

 basal part, which is a sixth the total length; impressions rather sharp 

 and distinct, subentire, the stria distinct between them; foveae rather 

 long, very deep, oval, adjoining the distinct carina; elytra slightly 

 over one-half longer than wide, scarcely more than two-fifths wider 

 than the prothorax, parallel, with distinctly arcuate sides and mod- 

 erately rounded humeri; striae fine, impressed only suturad, obsolete 

 at about apical fourth; punctures fine, moderately separated, less 

 fine and close-set in the sutural series; foveae near basal fourth and 



