462 WILLIAM G. DIETZ, M.D. 



Fourtli tarsal joint longer than the two preceding joints. Elytral inter- 

 spaces with a row of acute granules. PI. xiv, fig. 39- • .gracilipes. 

 Fourth tarsal joint shorter than the two preceding joints. 

 Front concave, dorsal channel obsolete. Elytra with rows of acute gran- 

 ules asperulus. 



Front not concave, dorsal sulcus distinct. Elytra not asperate. 



Beak as long as the head, fourth tarsal joint distinctly shorter than the 



two preceding joints. PI. xiv, fig. 37a squamosus. 



Beak shorter than the head, fourth tarsal joint scarcely shorter than the 

 two preceding joints. PI. xiv, fig. 376 pusillus. 



P. cavifrons Lee. PI. xiv, fig. 37. — Oval, black, legs rufo-testaceous, above 

 clothed with small, black and white scales, beneath with larger, pale ochreous 

 scales. Beak a little longer than the head, a little widened at the apex, suban- 

 gulate on the sides densely punctured and scaly ; antennse stout, inserted two- 

 fifths from the apex ( %), or just beyond the middle ( ?) ; joints 2-3 of funicle 

 subequal, a little longer than the outer joints, club subelliptic, acuminate. Head 

 densely punctured and scaly, front deeply concave; prothorax more than one- 

 half wider than long, strongly narrowed in front, base broadly bi-emarginate, 

 sides rounded, apex constricted, broadly and transversely sulcate in its anterior 

 half, anterior margin elevated with two approximate cusps, lateral tubercles 

 rather large, acute, dorsal channel entire, surface densely punctured, sides and 

 transverse sulcus densely clothed with whitish scales. Elytra broadly oval, about 

 one-third wider at the base than the prothorax, broadly rounded on the sides, 

 striae feebly impressed, closely punctured, each puncture bearing a pale scale, 

 interspaces wide, flattened, except interspaces 3, 5, 7 and 9, which are convex, 

 the former with a row of rather distant tubercles, scales predominantly pale, 

 those of the tubercles blackish, a distinct spot behind the scutellum and another 

 behind the middle on the sutural interspaces of whitish condensed scales, under- 

 side densely squamous. Legs slender, thinly clothed with white scales, femora 

 annulate near the apex, tarsi slender, third joint not broadly bilobed, fourth about 

 as long as the two preceding joints together. Length 2.5 mm. ; 0.10 inch. 



% . Ventral segments broadly impressed along the middle, the fifth foveate. 



9 • Ventral segments feebly impressed. 



Hab. — California, Utah. 



Easily recognized by the rows of tubercles on the alternate elytral 

 interspaces. A specimen in ]Mr. Ulke's collection presents some 

 structural differences from the typical form tliat I deem it proper to 

 refer to it as a distinct variety which eventually may prove to be 

 specific. 



Var. forvipes. — Differs in the following characters: Larger, the 

 anterior transverse sulcus of the prothorax is nuich shoi'ter, antero- 

 pcjsteriorly, lateral tubercles obtuse and less prominent. Elytra more 

 elongate and more evidently narrowed posteriorly, fifth interspace 

 with a few tubercles, third tarsal joint more broadly bilobed (this is 

 quite evident on compari.son with the typical form). Length 3.25 

 nnn. : 0.18 inch. 



