Dec, 1905.J Fall: Affinities of the Genus Tachycellus. 173 



length rather less than the width at base ; basal impressions broad and moderately 

 deep, thickly punctured. 



" Canada and Ohio." 



At once distinguishable by its stouter form and darker color from 

 the more common atrimedius, the only other species with sharply 

 defined posterior thoracic angles occurring in the same region. 



T. conformis, new species. 



Length 6.5 mm. Black, shining, basal joint of antennae pale ; legs piceous, the 

 tibiae, especially at base, somewhat paler. Prothorax distinctly narrowed behind, 

 slightly wider at base than long at the middle ; hind angles nearly right ; basal im- 

 pressions broad, very finely and quite sparsely punctate ; elytra finely striate. 



Washington and California. 



Described from a single female specimen from Washington (State), 

 sent me years ago as nigrinus. As compared with nigrinus it is 

 larger, the thorax more narrowed behind, basal impressions widely 

 punctate (nearly or quite impunctate in nigrinus), third joint of an- 

 tennae glabrous, elytra more finely striate. 



The latter locality — California — is represented by several ex- 

 amples taken by Dr. Fenyes at Pt. Reyes. There is also an example 

 in the LeConte collection, the specimen being placed with nigrinus. 



T. badiipennis Hald., Proc. Acad. Nat. Sci. Phila., I (18S3), p. 302. 



" Length 5-6 mm. Blackish ; bead of prothorax pale ; elytra piceous or dark 

 testaceous ; body more slender ; prothorax distinctly narrowed behind ; hind angles 

 obtuse, rounded ; basal impressions well marked, sparsely punctured ; legs ferrugi- 

 nous, thighs and tips of tibiae sometimes darker ; first joint of antennae pale." ( Le- 

 Conte' s description.) 



This species ranges from New England and Canada to Virginia 



and Kansas. 



T. nigrinus Dej., Spec. IV (1829), p. 39. 



"Length 5.5-6.5 mm. Black, shining, not iridescent; prothorax with hind 

 angles rectangular ; basal impressions linear, strongly marked, smooth, or scarcely 

 punctured ; anterior transverse impressions distinct, strongly angulated ; upper part 

 of tibiae and first joint of antennae testaceous." (LeConte's description. ) 



Alaska, Lake Superior, New Mexico (Beulah), Northern Cali- 

 fornia (McLond, Fenyes). 



The prothorax is less narrowed posteriorly than in any of our 

 other species. 



T. turbatus, new species. 



Robust, feebly convex, piceous black with very faint greenish surface lustre, 

 marginal bead of prothorax, legs, and antennae pale. Antennae a little less than half 



