92 PROCEEDINGS OF THE NATIONAL MUSEUM vol.89 



PHYLLOPHAGA (USTROCHELUS) OPACICOLLIS (Horn) 



FiGUBES 3, k; 11, h-k 

 Lislrochelvs opacicollis Horn, Trans. Amer. Ent. Soc, vol. 7, p. 145, 1878. 



Male. — Small, robust-oval, strongly and entirely pruinose except 

 for head, hairy above. Head with a weak but noticeable transverse 

 carina, surface behind carina without punctures; front very strongly, 

 densely, rugosely punctured, with moderately long and erect pile; 

 clypous punctured as front, the punctures, however, much finer, apex 

 slightly reflexed, subtruncate at middle, with moderately rounded 

 angles. Antenna 10-segmented, testaceous, club a httle longer than 

 funicle. Thorax finely, moderately densely punctured, less densely 

 so at center, with longer, erect, yellcwifh hairs; lateral margins strongly 

 dilated at middle, very finely crenulate, with very long yellowish cilia; 

 front angles rounded, hind margins subangular but very obtuse. 

 Elytra finely, rugosely punctate, with long erect hair, striae except 

 sutural obsolete. Pygidium strongly convex, highly pohshed, very 

 finely, moderately densely punctate, with short suberect hairs, apex 

 subtruncate. Abdomen strongly, transversely gibbose at middle, 

 surface finely, densely, and setigerously punctate, the hairs fine and 

 long; sixth segment punctured as fifth, but surface flatter and with 

 a median longitudinal carina faintly indicated. Hind tibia moderately 

 densely pilose within. All tarsal claws each with a small hardly 

 obvious submedian tooth, the surface between the tooth and base of 

 claw very minutely crenulate. First two segments of front tarsus 

 each with small inner spinelike projections at apex; hind tarsi mod- 

 erately hairy, first segment slender, and but little wider at apex than 

 at base. 



Female. — Antennal club slightly shorter than funicle. Pygidium 

 convex, sides straight and strongly convergent apically, the apex 

 truncate. Disk with coarse and moderately dense punctures and 

 with short suberect hairs, the surface rugose. Abdomen evenly con- 

 vex, highly polished, and sparsely punctured; fifth sternite slightly 

 depressed apically, with a few scattered coarse punctures among the 

 finer ones; sixth segment with coarse scattered punctures, surface 

 rugose. All claws with a short tooth at center, surface between tooth 

 and claw base minutely serrate. First segment of front tarsi with a 

 blunt spine at inner apex. Otherwise similar to male. 



Length. — 11-14 mm. Width. — 5-6.5 mm. 



Type. — In the Horn collection. 



Type locality. — "Utah, Arizona and New Mexico." 



Specimens examined. — Males, 22; females, 17. Arizona: General 

 in the eastern half of the State, from Williams south, and east to 

 Cochise County, July. Utah: Cedar City, Iron County, June 25 



