10 GEO. H. HORN, M. D. 



immature specimens are before me with the bands quite well marked, 

 these by their size and appearance resemble to a deceptive extent 

 some of the forms of our eastern undatus (var. moUinus), but the 

 presence of the mesocoxal and epipleural lines will at once separate 

 the present species. 



Occurs in the region from Washington southward through Cali- 

 fornia to Arizona, also in western Nevada. 



H. briinneus Mels. — Oblong, moderately convex, pieeous, slightly shining, 

 surface with the usual short, semi erect pubescence, margin fimbriate with 

 slightly longer hairs, elytra with the usual sinuous fascise. more or less inter- 

 rupted and in some specimens scarcely distinct. Antennse pieeous, two basal 

 joints somewhat paler. Head densely finely punctured, subopaque. Thorax 

 fully twice as wide as long, sides arcuate, slightly narrowed in front in 9 , base 

 feebly arcuate at middle, obliquely sinuate each side, the basal marginal line 

 entire, disc moderately convex, extremely finely and densely punctulate, color 

 entirely pieeous, rarely with the front angles slightly yellowish. Elytra parallel, 

 disc nearly always substriate, the punctuation variable, usually fine and dense, 

 less commonly quite coarse and conspicuous, markings almost exactly as in 

 moUbms, and at times almost entirely obliterated. Epipleuraj without basal ob- 

 lique line. Body beneath, in mature specimeus, entirely pieeous. Metasternum 

 with distinct post mesocoxal line. Legs usually entirely pieeous, but variable 

 from maturity. Length .12— .16 inch.; 3—4 mm. 



Male. — Labrum much broader than long, nearly semicircular, apex entire. 

 Mandibles not prominent; clypeus slightly convex. Thorax as broad as the 

 elytra, very slightly narrowed in front. 



i^emaZe. - Labrum twice as wide as long, broadly, but not deeply emarginate 

 in front. Thorax distinctly narrower than the elytra and more narrowed in 

 front than the male. 



Variations. — As in all the other species, this one varies in the ex- 

 tent of the sinuous markings of the elytra, being at times complete, 

 but usually broken into spots. In the vast majority the thorax is 

 entirely pieeous, but in some the front angles are paler. None have 

 been seen with the entire border pale. The elytral sculpture varies 

 in the punctuation and striation. In some the punctures are quite 

 coarse and conspicuous, or again very fine. On the whole the speci- 

 mens are more distinctly striate than in any other species, although 

 this, too, is variable. The legs vary in color. In those specimens 

 the markings distinct and entire and which have very often the 

 bands united along the border, the legs when seen from beneath are 

 almost entirely yellow, the upperside of the tibiae is black. In the 

 darker and indistinctly marked specimens, which are the most com- 

 mon, the legs are either entirely pieeous or the front femora slightly 

 yellow. 



