AMERICAN COLEOPTERA. 35 



setas, before which it is plainly declivous. Terminal joint of maxillary 

 palpi ovate, acutely pointed, but slightly more than twice as long as 

 wide. Front and clypeus rather densely punctate, punctures becom- 

 ing well separated only at the middle of the vertex; clypeus with only 

 faint trace of transverse ridge, the margin more broadly reflexed than 

 in the allied species, similarly sinuate emarginate. Prothorax widest 

 at middle, the sides strongly arcuate. Elytra more conspicuously 

 widened posteriorly than in allies, intercostal spaces narrower than 

 in conformis and much narrower than in mentalis; the second and 

 third having no more than a confused single or double series of punc- 

 tures. Metasternum smooth at middle; ventral segments finely 

 sparsely punctate at middle. Upper tooth of front tibia midway 

 between the base and apical tooth. Ungual tooth nearly as in men- 

 talis. Length 8.75 mm.; width 4.6 mm. 



One example (type) from Idaho in the Horn collection; a 

 second specimen from British Columbia (Liebeck collection) 

 is also referred here. It is piceous in color and differs a little 

 in the elytral punctuation, and the metasternum is not smooth 

 at middle. 



From conformis, to which it is closely related, this species 

 may be separated by the more broadly reflexed clypeus and 

 differently punctate head; the terminal joint of the maxillary 

 palpi is still shorter. The antennae are seemingly 9-jointed, 

 the fifth and sixth joints being completely united, the line of 

 junction, however, being plainly evident on one side but not 

 on the other. I doubt very much if this is anything more 

 than accidental. 



20. D. tenebrosa n. sp. 



Rather robust, evidently wider behind, black or piceous, prothorax 

 without or with barely detectable alutaceous sculpture, elytra dis- 

 tinctly alutaceous. Mentum flat posteriorly, evidently but rather 

 feebly declivous in front, the posterior (upper) limit of the declivity 

 marked with a row of seta? but with only a faint trace of transverse 

 ridge. Terminal joint of maxillary palpus barely twice as long as 

 wide. Front and clypeus moderately densely evenly punctate, the 

 latter without basal ridge; clypeal suture distinct, nearly straight, 

 front margin sinuate at middle. Prothorax nearly twice as wide as 

 long, sides moderately rounded at middle, subparallel or very slightly 

 convergent behind, more convergent in front; surface moderately 

 closely punctate at sides, the punctures at middle a little sparser, 

 separated by from one to two times their own diameters. Elytra 

 three times as long and one-third wider than the prothorax; one-fifth 



TRANS. AM. ENT. SOC, XXXV. FEBRUARY, 1909. 



