94 PROCEEDINGS OF THE NATIONAL MUSEUM vol.89 



less noticeable; fifth segment coarsely and moderately densely punc- 

 tate; sixth segment slightly convex, shorter than and more coarsely 

 and sparsely punctate than the preceding segment. First segment of 

 hind tarsus slightly expanded each side at apex (as in diagram). All 

 claws finely serrate along a single margin and each with a very fine 

 submedian tooth. All other characters, as well as the spined front 

 tarsi, as in male. 



Length. — 12.5-14 mm. Width. — 5.5-6.5 mm. 



Type. — In the United States National Museum. 



Type locality. — "Santa Rita Mts., Arizona." 



Specimens examined. — Males, 15; females, 16. Arizona: Pinal, 

 Pima, Cochise, and Graham Counties, in the southeastern parts of the 

 State, June 6 (Comstock) to August 8 (Huachuca Mountains). New 

 Mexico: Silver City. 



Remarks. — Though resembling several small and densely pruinose 

 species, L. tarsalis is the only one with a thorax that is apparently 

 (view vertically) impunctate and glabrous, except at the sides. Also, 

 the first hind tarsal segment is always very strongly expanded near the 

 inner apex in the male and somewhat more so than usual in the female ; 

 the type of tarsal expansion in both sexes is not quite duplicated in 

 any of the others species in the genus. 



PHYLLOPHAGA (LISTROCHELUS) SCUTICEPS (Bates) 



Figure 6, k-n 



Listrochelus scuticeps Bates, Biologia Centrali-Americana, vol. 2, pt. 2, p. 171, 



1888. 



Male. — Oblong-oval, rufotestaceous, head and thorax shining rufous, 

 elytra partly to almost entirely pruinose. Head subrugose with dense, 

 gross, and variolate punctures, apparently glabrous; transverse 

 carina of vertex moderately well indicated, surface behind carina 

 impunctate; clypeus punctured as front, disk flattened and glabrous, 

 apex reflexed and truncate, angles moderately broadly rounded. 

 Antenna 10-segmented, unicolorous rufotestaceous, club subequal to 

 funicle. Thorax with disk densely, finely, rather regularly punctured, 

 somewhat denser near sides and apex; base and apex strongly mar- 

 gined; lateral margins coarsely crenate, ciUate, angles obtusely 

 rounded, the hind angles not subangulate. Elytra finely, moderately 

 densely punctured, with minute recumbent hairs, surface subrugose, 

 costae besides sutural weakly indicated. Pygidium strongly convex, 

 moderately densely, finely punctured, with short suberect hairs; apex 

 truncate, and margin slightly tliickened and a little reflexed, cihate. 

 Abdomen flattened at middle, slightly polished, strongly pruinose at 

 sides; sparsely, finely punctate at center, with short erect hairs, the 

 punctures and hairs larger and coarser near sides; sixth segment 



