AMERICAN COLEOPTERA. 129 



spur of iiiitMle tibia S stout, obtuse at tip, one-b;ilf shorter than the 

 outer spur. LenL:;th .32 — .38 inch; 8 — 9.5 mm. 

 Specimens are from Georgia, Kansas and Nebraska. 



A. subseneus, Lee. Pacif. R. R. Rep. 1857, App. i,p. 41. — Oblong, sub-parallel, 

 black, with a?ncous lustre. Head coarsely punctured more densely toward the 

 sides; elypeus feebly eniarginate and rounded on each side; genre feebly pro- 

 minent. Thorax very convex, transversely coarsely punctured, more densely 

 toward the sides; sides nearly straight, hind angles nearly rectangular, base dis- 

 tinctly margined. Elytra oblong, robust, sides sub-parallel, faintly striate, strias 

 finely punctured, interspaces flat, very moderately and sparsely punctulate and 

 alternately distinctly alutaceous. Body beneath black, legs piceous, hind 

 tibiae rather slemier. Length .18 — .20 inch , 4.5 — 5 mm. 



The elytra are not uniformly black but have a broad yellow vitta on 

 each occupying the second, third and fourth interspaces, usually irregu- 

 lar on tlie outer side and extending to the tip of the elytra. Other 

 specimens have the alternate interspaces yellow, the bands being more 

 or less interrupted and not attaining the apex, and one specimen has 

 the second and fourth interspaces yellow, united near apex by an oval 

 spot, and smaller spots at bases of second to sixth interspaces. The 

 apices of the elytra are usually finely alutaceous and the epipleura) in 

 several specimens rufous. 



Occurs at San Francisco, Cal. 



A. alternatus, n. sp. — Oblong, black, shining. Head coarsely not densely punc- 

 tures except at sides and in front. Clypeus feebly emarginate at middle, broadly 

 rounded on each side and very slightly sinuate in front of the moderately pro- 

 minent gence. Thorax less convex than in subcsneus, sides moderately rounded, 

 base faintly margined near the sides, not margined at middle, surface coarsely 

 punctured, coarser and more dense at the sides. Elytra oblong parallel, moder- 

 ately convex, striate, strife coarsely punctured, interspaces flat, alternately yel- 

 low, and coarsely punctured more densely toward the sides and apex. Body 

 beneath black, legs piceous, hind tibite slender. Length .18 — .24 inch ; 4.5 — 6 

 mm. 



Varies also in color as in siibseneun, one specimen before me has 

 the bases of intervals two to six yellow, and the second, fourth and six 

 intervals yellow to apex, another has only the second and fourth, while 

 still another is apparently entirely black, but a strong light shows the 

 alternate intervals very distinctly paler than tlie others. It resembles 

 subseneus in form, but may easily hi kncjwn by the absence of metallic 

 lustre and the rather coarse punctures of the elytra. 



Several specimens from Bitter Root Valley, and one from an un- 

 known region of California. 



A. terminalis, Say, Journ. Acad, iii, 182.'?, p. 21.3. — Elongate oval, moderately 

 robust, black, shining. Head coarsely punctured and rugose in front; clypeus 

 feebly emarginate and on each side broadly rounded. Thorax s^^arsely puuc- 



