LeConte.] 



APPENDIX. 425 



are quadrate and confluent. Pygidium coarsely punctured ; beneath 

 shining, sparsely punctured; more coarsely on the 5th ventral, which is 

 impressed near the tip ; flanks of prothorax and middle of abdomen nearly 

 smooth. Third joint of tarsi scarsely broader than second, glabrous be- 

 neath, fringed only at the sides. Length 9.7 mm.; .38 inch. 



Colorado, one specimen, Mr. B. D. Smith. The presence of the post- 

 apical group of large punctures on the prothorax affiliates this species to 

 C. pl'tcidus, which however it does not otherwise resemble. 



Sphenophorus oblitus, n. sp. 



Of the same general form as 8. placidus, black, covered with a dirt-col- 

 ored crust. Beak two-thirds the length of the prothorax, stout, slightly 

 curved, more strongly compressed at tip ; punctured at base, smooth at 

 tip ; frontal groove deeply excavated, extending to the base of the narrow 

 part of the beak. Antennae inserted just in front of the eyes. Prothorax 

 more than one-half wider than long, sides parallel for two-thirds the length, 

 then gradually and obliquely narrowed to the tip, which is less strongly 

 tubulate than usual ; surface covered with large, shallow punctures, with 

 the depressions very feebly indicated : the punctures just behind the con- 

 striction are a little denser at the middle, representing thereby the small 

 impression which is distinct in S placid'is, and nearly obsolete in S. vario- 

 losus ; there is no smooth dorsal line. Elytra with fine striae, very feebly 

 punctured ; interspaces with single rows of very fine punctures, alternately 

 a little wider and more elevated. Pygidium sparsely and deeply punctured. 

 Beneath coarsely punctured on the flanks of the prothorax ; punctures 

 smaller and distant at the middle of the abdomen ; fifth ventral sparsely 

 and very deeply cribrate. Thighs sparsely and rather feebly punctured ; 

 front tibioe distinctly sinuate on the inner side, but not angulate ; tarsi 

 with the third joint not dilated, glabrous beneath, fringed only at the sides. 

 Length 9.6 mm. ; .38 inch. 



Texas ; one specimen, Mr. G. W. Belfrage. This is also to be placed 

 near placidus, to which it has but little resemblance. It also shows a ten- 

 dency towards the compressirostris form, in which, however, the beak is 

 not curved, and the front tibiae are strongly angulated on the inner side. 



Sphenophorus cariosus Oliv., Ent. v, 83, 91, pi. 28, 415 ; Horn, Pr. 

 Am. Phil. Soc. 1873, 420, cum. synon. 



Dr. Horn has suggested to me that this species and S. callosu* Oliv., 

 should be united. After careful examination of the specimens in my col- 

 lection, I think this view is correct. Those who are inclined to adopt it 

 will place callosus as the synonym, since it is represented by old and 

 abraded specimens. 



Sphenophorus sculptilis Uhler, Proc. Acad. Nat. Sc. Phil. 1855, 

 416 ; Horn, 1. c. 424. 



With this species should be united as a synonym S. Zees Walsh, Practical 

 Entomologist, ii, 117 ; Riley, Missouri Ent. Report, iii (1871), 59, fig. 22. 



PROC. AMER. PHILO8. SOC. XV. 96. 3B 



