NORTH AMERICAN COLEOPTERA. 21 



The two specimen?? before me are females and have the anterioi- 

 tibial s])ur slender, acute and slightly arcuate. 



From Colorado without definite locality, and from Como, Wyoming. 

 Probably a species of high altitudes. 



A. consociatiis n. sp. — Moderately elongate and convex, parallel, black, 

 shining, legs brownish, elytra dull yellow, the sutural interval and lateral -space 

 piceous. Antennse testaceous, club fuscous. Head coarsely and deeply punctured 

 at the sides, the middle very convex and less punctate, front not tuberculate: 

 clypeus somewhat retuse in front, the anterior margin scarcely emarginate, the 

 angles rounded, the sides arcuate, gense feebly prominent and obtuse. Thorax 

 nearly twice as wide as long, the sides nearly straight and parallel, arcuate in 

 front, hind angles obtusely rounded, base arcuate, the marginal line very dis- 

 tinct; disc convex, the punctures coarse and moderately closely placed over the' 

 entire surface, a little denser and coarser at the sides. Elytra as wide at base as 

 the thorax, humeri very distinct, sides parallel, less striate, striae with moder- 

 ately coarse and close, but not deep punctures, intervals very flat, finely aluta- 

 ceous, irregularly biseriately, indistinctly punctate ; color dull yellow with the 

 sutural interval and a lateral posthuniel-al stripe piceous, sometimes the intervals 

 3-5-7 are darker. Body beneath alutaceous, sparsely punctate. Mesosternum 

 not carinate, coarsely punctate, an oval median opaque alutaceous space. Ante- 

 rior tibise smooth in front, tridentate externally, crenate above, the first tarsal 

 joint shorter than the second. Posterior femora sparsely punctate, the first tarsal 

 joint nearly as long as the next three. Length .20 inch ; 5 mm. 



il/fl/e.— Spur of anterior tibia stout, falciform, but feebly curved. 



Female.— S\mr of anterior tibia slender, acute, slightly arcuate. 



The majority of the specimens have the suture piceous and the 

 lateral stripe broad beginning at the humerus and extending poste- 

 riorly, contiguous to the lateral margin, except near its end. There 

 is one specimen before me with the third, fifth and seventh intervals 

 darker, and it is probable that specimens will occur entirely black. 



It is highly probable that this species is mistaken for mbceneii.s or 

 alternatus in most collections, from either of which it may be known 

 by the entire basal marginal line. 



Occurs in California, the precise region unknown, but pr()l)al)ly 

 from the south. 



A. subseuens Lee— Oblong, convex, black with di.stinct lencous lustre, 

 elytra dull yellow, irregularly striped with piceous. rarely entirely black, legs 

 rufo-piceous. Antenna; rufo-testaceous, club piceous. Head convex, without 

 tubercles, coarsely punctate, densely at the sides. Clypeus broadly aud feebly 

 emarginate, obtuse. Thorax feebly narrowed in front, the sides nearly straight, 

 slightly arcuate in front, hind angles nearly rectangular, but slightly obtuse at 

 apex, base arcuate, with the marginal line distinct for a short distance near the 

 angles, disc convex, moderately punctate, the jniuctures close but not dense and 

 equally dispersed over the entire surface usually with a smooth median line. 

 Elytra as wide at base as the thorax, humeri obtuse, disc finely striate, striae 



