REVISION OF LISTROCHELUS SAYLOR 97 



Type. — In the LeConte collection. 



Type locality. — "Fort Riley, Kansas." 



Specim.ens examined. — Males, 31; females, 6. Arizona: Flagstaff, 

 July (Wickham) [U.S.N. M.l. New Mexico: Tenaja (Wickbam) 

 (U.S.N.M.j; Torrence County (Douglas) [U.S.N.M.]; Grady, July 16 

 (Beamer) [Snow Museum]. Nebraska: Lincoln, July [U.S.N.M.]. 

 Colorado: "Colorado" and Colorado Springs [U.S.N.M.]; La Junta, 

 July 21 (Relin and Hebard) [American Museum]; Cragmore, June 

 [U.S.N.M.]. Texas: New Braunfels [Robinson]. 



Remarks. — This species forms, along with L. koehleriana and L. 

 neomexicana, a rather compact group of the genus, in the characters 

 of the hair}^ hind tibiae and tarsi, rugosely sculptured head, and 

 robust facies. The male genitalia are closely allied as regards simi- 

 larity in form but are distinct and are apparently not variable within 

 the species; the main specific differences are evidenced in the aedeagus 

 rather than in the lateral lobes of the claspers. 



PHVLLOPHAGA (LISTROCHELUS) FALSA (LeConte) 



Figures 2, c; 4, /; 9, a-c 



Listrochelus falsris LeConte, Journ. Acad. Nat. Sci. Philadelphia, ser. 2, vol. 3, 

 p. 264, 1856.— Horn, Trans. Amer. Ent. Soc, vol. 7, p. 147, 1878. 



Listrochelus langeri Chapin, Proc. Biol. Soc. Washington, vol. 47, p. 93, 1934 

 (new synonymy). 



Male. — Oblong-oval, wider behind, rufous above, sparsely pilose, 

 thorax shining; elytra very highly pruinose. Head with front flat- 

 tened, moderately coarsely punctate, vertex with a moderately 

 prominent transverse carina; clypeus punctured as front, with sparse 

 erect hairs, apex subtruncate and faintly emarginate, slightly reflexed, 

 angles moderately broadly rounded. Antenna 10-segmented, uni- 

 colorous, club one-sixth longer than funicle. Thorax shining, finely, 

 moderately densely, irregularly punctured, with short scattered 

 hairs near base and sides; front angles broadly rounded, hind angles 

 obtuse but moderately distinct, base and apex strongly margined; 

 lateral margins ciliate and finely crenulate, less obviously so behind 

 the moderate median dilation. Elytra finely punctured, rugosely 

 M^rinkled, with scattered small yellowish hairs arising from the highly 

 pruinose surface; striae, except sutural, not obvious. Pygidium 

 strongly convex, highly polished, very finely, moderately densely 

 punctured, each puncture bearing a minute recumbent hair; apex 

 broad and subtruncate. Abdomen convex, with segments 1 to 3 

 polished and moderately densely pilose; third segment abruptly 

 raised at middle apex; fourth and fifth segments of approximately 

 equal size and each very sparsely pilose, the two together having a 

 common transverse sulcus, the latter being deepest at the point of 



