112 PROCEEDINGS OF THE NATIONAL MUSEUM vol.89 



faintly pruinose at base, finely, moderately densely punctate, with 

 minute hair, apex poHshed and subtruncate. Abdomen subpruinose 

 at sides, slightly shining at middle, very slightly convex and finely 

 sparsely punctate at center, with short suberect hair; fifth segment 

 plane, very slightly, hardly noticeably, transversely impressed near 

 apex; sixth with faint longitudinal sulcus, surface moderately densely, 

 coarsely punctate, with sparse short hairs. All claws with a small 

 triangular, median tooth, and minutely serrate on a single margin. 



Female. — Unknown. 



Length. — 12 m. Width. — 5.5 mm. 



Type: In the collection of the Snow Museum at Kansas University. 



Type locality. — "Chiricahua Mts., Ariz., VII-2-32, Duncan Col- 

 lector." 



Specimens examined. — The holotype, examined through the kindness 

 of the describer, R. E. Barrett, of Saticoy, CaUf. 



Remarks. — The male genitalia are not closely similar in form to 

 those of any other species. Known only from the type. 



PHYLLOPHAGA (LISTROCHELUS) ARIZONA, new species 



Figure 6, e, / 



Male. — Identical in all respects with L. duncani, differing only in 

 the conformation of the genitalia (see fig. 6, e,/). 



Female.— More robust, elytra with longer and more obvious hair; 

 antennal club small and shorter than the funicle. All claws with a 

 strong median tooth and minutely serrate between the base and the 

 tooth along a single margin. Transverse carina of vertex well de- 

 veloped. Pygidimn slightly convex, smooth, polished, slightly prui- 

 nose basally; disk with fine and sparse punctures, apex rounded. 

 Abdomen convex, polished, smooth, apex of fifth and of sixth segment 

 with coarse and moderately dense punctures. Otherwise as in the male. 



Length.— 11-15 mm. Width. — 5.5-6 mm. 



Types. — Holotype male from Prescott, Ariz. [Saylor], and allotype 

 female from Fort Wingate, N. Mex. [Casey], both deposited in the 

 United States National Museum (No. 53774). 



Paratypes: Males, 7; females, 3. Arizona: Prescott, May [Saylor]; 

 Wilhams, July 1920 (Barber and Schwarz) [U.S.N.M.]; Bright Angel 

 (Barber and Schwarz) [U.S.N.M.]; Phoenix [Saylor], SpringervHle, 

 1927 (Beamer) [Snow Museum]. Texas: Fedor, May [Saylor]. 



Remarks. — Some variation occiu-s: The transverse carina of the 

 vertex is sometimes interrupted at the middle; the smooth central 

 area of the thorax may not be a distinct band but may have an un- 

 even edge; the pygidium may be less densely and more coarsely 

 punctate; and the antennal club may vary from one-fourth to one- 

 third longer than the funicle. 



