REVISION OF LISTROCHELUS — SAYLOR 99 



PHYLLOPHAGA (LISTROCHELUS) FALSA NOGALES. new subspecies 



Male. — Entire elytra and thorax very densely pruinose above, the 

 latter glabrous on disk, the punctures very fine and almost obscured 

 by the pruinosity. Clypeus apparently glabrous on disk. First seg- 

 ment of hind tarsi slender and hardly at all expanded apically (no 

 more than is normal in any species of the genus) ; first two segments 

 subequal in length. All other characters, including the genitalia, the 

 same as in the typical form. 



Female. — Thorax very densely pruinose, punctures almost obscured 

 by the pruinosity. Clypeal disk apparently glabrous. Otherwise the 

 same as in the typical form. 



Length. — 13-15 mm. Width. — 6.5-7.5 mm. 



Types. — Holotype and allotj^pe are from Mount Washington, 6,000 

 feet, Nogaies, Ariz. (Saylor), and are deposited in the United States 

 National Museum (No. 53765). 



Paratypes: Males, 1; females, 1. Arizona: Huachuca Mountains 

 [Saylor]. 



Remarks. — The densely pruinose and hardly perceptibly punctate 

 thorax, the nonexpanded first hind tarsal segment of the male, and 

 the nonpilose clypeus of the present subspecies seem to justify setting 

 it oft' as distinct; indeed, the entire facies of the beetle are closer to 

 those of L. tarsalis than to L. Jalsa, owing to the highly pruinose 

 condition of the dorsal area. Were it not for the apparently identical 

 genitalia of the males, I would not hesitate to describe this as a 

 separate species. 



PHYLLOPHAGA (USTBOCHELUS) KOEHLERIANA. new speciea 



FiGUHES 3, n; 11, a-d 



Male. — Robust, elongate, hauy above; head and thorax rufous and 

 shining, the elytra darker and strongly pruinose. Head very coarsely 

 and rugosely punctate, with erect hair; transverse carina well marked, 

 usually impunctate behind; clypeus strongly transverse, a httle more 

 finely and densely punctate than the front; clypeal apex strongly 

 reflexed, sub truncate, angles moderately rounded. Antenna rufo- 

 testaceous; club testaceous and slightly longer than the funicle. 

 Thoracic disk with very fine and fine punctures intermixed, the 

 puncturation rather dense at sides and front, the larger punctures 

 more noticeable along the front margin; a slight central area of the 

 disk impunctate; center-base, near sides and along the front margins 

 with long or short hairs; lateral margins ciliate, finely crenulate, the 

 angles prominent but obtuse. Elytra finely subrugosely punctate, with 

 long and erect moderately dense hairs; striae, except sutural, obsolete. 

 Pygidium convex, highly polished, very finely and densely punctate, 



