ROLAND HAYWARD. 63 



Elytra oblong-oval; form broader aiKl less convex. 

 Thorax about one-half wider than long, scarcely narrower at base than 

 apex, sides obsoletely sinuate behind, hind angles subrectangular ; 

 elytra more than one-half wider than the thorax, moderately deeply 

 striate, dorsal punctures large ; legs black. Length .16-.21 inch. 



quadrifoveoliitiim Mann. 



Thorax about one-half wider than long, as wide at base as apex, sides not 



sinuate behind, hind angles sub-obtuse; elytra about one-half wider 



than the thorax, finely striate, more finely at sides and tips ; legs 



rufo-piceous. Length .18-.20 inch inaeklini Lee. mss. 



4. Thorax slightly narrower at base than apex. 



Broad, slightly depressed ; black, usually bronzed, very shining ; elytra finely 

 striate, with five or six striae, the first only entire ; legs black. Length 



.16-.18 inch breve Mots. 



Elongate, depressed ; black, slightly jeneous ; sides of thorax arcuate in front 

 oblique behind, hind angles obtuse, but not rounded ; elytra finely 

 striate, the strife entire, very fine at sides and tip ; legs piceous or 

 nearly black. Length .16-.20 inch iiebraskeuse Lee. 



27. B. planatmn Lee. — Form moderately broad, very depressed ; color 

 nearly black, often more or less aeneous, moderately shining, the elytra usually 

 tinged with brownish. Head as wide as the thorax at apex; palpi black; an. 

 teunse rather more than one-half the length of the body, nearly black. Prothorax 

 slightly wider than long, as wide at base as apex, slightly rugose at base ; apex 

 nearly truncate ; median Hue distinct, abbreviated in front; transverse impres- 

 sions distinct, the anterior angulate ; basal impressions broad, deep, bistriate ; 

 sides with the margin distinctly reflexed, arcuate in front, feebly sinuate behind ; 

 hind angles rectangular, carinate. Elytra about one-half wider than the thorax, 

 oblong-ovate, moderately finely striate; striis entire, very finely or olisoletely 

 punctulate, the fifth feebly sinuate near the apex and grooved at tip; third stria 

 with the first dorsal puncture slightly in front of the middle, the second about 

 one-fifth from apex ; intervals flat. Beneath black, shining. Legs varying from 

 piceous to black. Length .27-.35 inch ; 6.75-8.75 ram. 



Our largest species of the genus. It is easily distinguishable by 

 its size from the others of the group. The form is usually very de- 

 pressed, rather less so in Pacific coast specimens. The color is usually 

 nearly black, frequently with more or less seueous lustre, the elytra 

 often brownish. The striae are very finely or obsoletely punctulate, 

 rather more distinctly so in specimens from the extreme Northwest. 

 At first sight it recalls certain species of Platynus. 



It occurs in the Lake Superior region, the Rocky Mountains, 

 Nevada, Oregon, Washington and British Columbia. I have taken 

 it abundantly at various localities in the more mountainous parts of 

 Colorado. 



28. B. simplex Lee. rass. — Form slender, elongate, slightly depressed ; color 

 nearly black, shining, the elytra usually more or less brownish. Head as wide 

 as the thorax at apex ; palpi piceous ; antenna; about one-half the length of the 



TRANS. AM. ENT. SOC. XXIV. FEBRUARY, 1897. 



