40 WILLIAM a. DIETZ, M. I). 



species. Legs stout, especiiilly til)iie, whicli are shorter thiin in moiitdiius ; fcmiora 

 not annulated ; tarsi as in montanus. Length 3.5 mm. ; 11 incli. Plate I, tig. 7. 



The last ventral se2:nient is not impressed in either sex. A very 

 distinct species. 



Hub. — Oregon. Six specimens in Dr. Horn's collection. 



HORNII Group. 



The two species contained in tliis group are aberrant in form and 

 differ in several important characters from other members of the 

 genus. Tliey are readily recognized by their stout, compact form, 

 very coarse sculpture and the dissimilarity of the sexes. The males 

 are ovate, the elytra attaining their greatest widths behind the mid- 

 dle. The females are broadly oblong ; they are black, densely cov- 

 ered with dirty, grayish brown, or piceous scales. They are separated 

 as follows : 



Larger. — Thorax channeled and constricted at apex Iloriiii. 



Smaller. — Thorax not channeled, gradually narrowed to tip setiger. 



iff. Horiiii n. sp. — Stout, black: antennie, apex of tibia' and tarsi rufous. 

 Rostrum : Male slender, cylindrical, longer than the thorax, moderately dilated 

 at apex and slightly curved ; median carina entire, distinct, lateral ones almost 

 obsolete, confluently punctured, sparsely .scaly. Scrobes sharply defined, directed 

 toward lower half of the eyes; absence of superciliary ridge and sulcus. Female 

 broader and stouter, not longer than the thorax, somewhat depressed, not 

 widened at tip, strongly tricarinate, upper margin of antennal grooves very 

 prominent, giving the appearance of a second lateral carina, which is continued 

 above as a superciliary ridge ; quadrisulcate, outer sulci deeper ; antennal grooves 

 directed asainst the ujtper half of the eyes; supraorbital sulcus evident. An- 

 tennse : scape long, suddenly and strongly incrassate at the apex. Funicle : second 

 joint a trifle longer than first; third to seventh gradually becoming wider; last 

 one subcontiguous to the club, which is bi-oadly elliptical. Head slightly convex, 

 separated from the beak by a transverse impression. Thorax : Male scarcely 

 one-half wider than long, slightly wider at base than apex ; sides almost straight 

 and divergent for two-thirds their length, then suddenly narrowed to and 

 broadly constricted at apex ; the constriction continued above as a transverse 

 impression ; a sharply impressed, median sulcus and a vague impression each side 

 about the middle ; surface confiuently, but not deeply cribrate. Female trans- 

 versely, subquadrate: hind angles rounded, sides very slightly and broadly 

 emarginate, otherwise as in the male. E'ytra : Male slightly wider at base than 

 the prothorax, subveutricose ; sides broadly rounded, widest behind the middle, 

 then rather rapidly narrowed to tip; broadly grooved with large foveiform 

 punctures, subconfluent or very narrowly separated ; interstices narrow, convex ; 

 each with a row of long, very stout, club-shaped setie, most conspicuous on the 

 convexity; a humeral spot, scutellum and a few scattered spots along the in- 

 flexed portion and on the convexity of whitish scales. Female distinctly wider 

 at base than the thorax ; oblong oval, not wider behind the middle, otherwise as 



