AMERICAN COLEOPTERA. 175 



Two specimens. Taho Valley, California. Dr. J. Gr. Cooper. Much 

 more slender than the preceding species. 



5. H. macer. — Elongate, black, thinly clothed with very short inconspicuous 

 yellow hairs; head densely and finely punctured, front with a feeble transverse 

 curved impression at the base of the beak, which is finely carinate; prothorax' 

 nearly one-half longer than wide, oval, with the base slightly rounded, deejjly 

 and coarsely punctured, punctures becoming smaller and more dense at the 

 sides, dorsal line very narrow, slightly elevated; elytra with rows of quadrate 

 punctures, intervals wider than the striae, thickly punctured and somewhat 

 rugose; antennse dark brown. Long, nearly 6 mm. 



California. Dr. Horn ; Nebraska, Mr. Ulke. Allied to II. porosus, 

 but thfe mesosteruum is not conical and protuberant, but truncate as in 

 //. nigrinns ; the thorax is longer than in either of the species named, 

 and is almost regularly oval, except at the base, which is very broadly 

 rounded. 



C. H. porosus. — Elongate, black, slightly shining, thinly clothed with short 

 erect yellowish hairs, arranged in rows upon the elytra; head densely punc- 

 tured," beak carinate, deeply transversely impressed at the base ; prothorax 

 longfer than wide, narrowed in front, feebly rounded on the sides, apex rounded, 

 base nearly truncate, disc tolerably thickly covered with large punctures and a 

 few small punctures intermixed, dorsal line narrow but conspicuous, extending 

 from the base nearly to the tiji; elytra not wider than the thorax, with strise 

 composed of large quadrate punctures, intervals strongly rugose and finely 

 punctured, the sutural and third slighth' elevated behind, and marked eacli 

 with a row of very small tubercles; tibiae serrate, with a few larger teeth' near 

 tlie tip. Long. 4"5 mm. 



California, two specimens; one sent me by Mr. Andrew Murray, the 

 other collected at Cabo de los Reyes, by Mr. George Davidson. This 

 species has nearly the form of H. itirjriiiKs, but differs from it as well 

 as from all the others of this division by the deep transverse frontal 

 impression at the base of the beak ; the mesosternum is slightly pro- 

 tuberant, though much less so than in the species of division B; the 

 3d tarsal joint is however not dilated as in those species, and the 

 front tibiae have a few large teeth near the tip. 



b. — Beak not carinated. 



7. H. tenuis Zimm. (Ante, p. 149.) 



B. — Mesosternum obtusely protuberant ; third tarsal joint dilated, 

 bilobed ; front tibiae rather finely toothed. 

 ti. Front not impressed : 



8. H. granulatus. — Oblong cylindrical, brownish-black, finely and thinly 

 pubescent, with short yellow hairs, and with rows of short bristles upon the 

 elytra; head convex, densely jiuncturpd, beak very distinctly carinate, carina 



