78 PROCEEDINGS OF THE NATIONAL MUSEUM vol.89 



defined, the surface behind the carina sparsely punctate and much 

 more sparsely so at the occiput; clypeal sulcus nearly straight, not 

 impressed; clypeus nearly trapezoidal in shape, sides straight and con- 

 vergent apically, apex sharply and markedly reflexed, truncate, the 

 angles very narrowly rounded; clypeal disk flat, slightly less densely 

 punctured than the front. Antenna 10-segmented, rufotestaceous, 

 the club testaceous and very slightly longer than the funicle. Thorax 

 subangulately dilated at about the middle of the lateral margins, 

 the margm ciliate and slightly crenulate; front and hind angles well 

 defined but obtuse; disk coarsely and densely punctate, the punctures 

 closer near sides and front margins, with a small mediobasal impunc- 

 tate area. Elytra very coarsely, not densely, but regularly punctured, 

 striae except the sutural not obvious. Pygidium convex, semi- 

 pruinose, entire surface coarsely and moderately densely punctate, 

 with moderately long erect hair; apex ciliate and subtruncately 

 rounded. Abdomen polished and somewhat flattened at middle, 

 sparsely punctured with erect hair; fifth segment moderately densely 

 and pilif erously punctate ; sixth shorter than fifth, moderately densely 

 and somewhat coarsely punctate. All claws very finely, hardly 

 noticeably serrate along a single margin, with no larger intercalated 

 teeth. 



Female. — Very similar to male in all respects except that the 

 antennal club is slightly shorter than the funicle and the abdomen in 

 lateral view is slightly convex instead of flattened. 



Length. — 10-11 mm. Width. — 5-5.5 mm. 



Types. — Holotype male and allotype female from "Purissima, 

 Lower Cahfornia, coUected October 23 by W. M. Mann," are in the 

 United States National Museum (No. 53760). Paratypes: One female, 

 same data, in the Saylor collection. 



Remarks. — Tliis new species shows the slightly asymmetrical male 

 genitaha characteristics of the Lower Californian L. pilosipes Saylor, 

 and the two together form a group that can be confused with no other 

 species groups in the genus ; the dense short hair and coarse punctura- 

 tion of the entire dorsal surface as well as the asymmetrical male 

 genitalia readily characterize the group. 



PHYLLOPHAGA (USTKOCHELUS) TROCHANTER, new name 



Figures 2, e; 4, a; 9, d~f 



Listrochelus gracilis Horn, Trans. Amer. Ent. Soc, vol. 12, p. 123, 1885 (pre- 

 occupied by Burm, 1855, and Nonfried, 1891). 



Male. — Oblong-oval, sides somewhat subparallel. Head and thorax 

 sliining rufous, elytra and legs rufocastaneous, the former moderately 

 pruinose. Head densely, not coarsely punctured, glabrous, the 

 clypeal suture not impressed; transverse carina of vertex sharp and 



