REVISION OF LISTROCHELUS SAYLOR 77 



Male. — Robust-oval, much wider behind, entire dorsal surface 

 moderately shining and with dense, very short, and erect hairs. Head 

 very densely, coarsely, and rugosely punctate, the transverse carina 

 of the vertex sharply defined, the surface posterior to the carina with 

 dense, moderately coarse, and transverse tumosities; clypeal suture 

 nearly straight, clypeus nearly hexagonal, apex truncate and very 

 strongly reflexed, sides straight and strongly convergent apically, the 

 angles narrowly rounded. Antenna 10-segmented, club two-thirds the 

 length of the funicle. Thorax punctured like head but more densely 

 so; lateral margins with long, dense cilia, and the entire margin finely 

 crenulate ; hind angles obtuse, front angles subrounded ; base and apex 

 with a strong and entire marginal line. Elytra punctured as thorax. 

 Pygidium convex, pruinose, densely and moderately coarsely punctate, 

 with moderately long erect hair. Abdomen flattened, subpruinose, 

 with moderately dense hair ; fifth segment twice the length of the sixth 

 and very densely setigerously punctate; sixth segment very slightly 

 convex, rugosely and setigerously punctate. All claws pectinate along 

 a single margin. First segment of hind tarsus equal in length to the 

 second. 



Female. — Length of the antenna and all other characters are 

 practically the same as in the male except that the abdomen is some- 

 what more convex. 



Length.— 12.5-15.5 mm. Width.— Q.5-7. mm. 



Type. — From "Cape San Lucas, Lower California," in the LeConte 

 collection. 



Specimens examined. — Males, 13; females, 12. Lower Cali- 

 fornia: Santa Rosa [U.S.N.M. and Robinson]; Triunfo, July 13, 

 1938 (Ross and Michelbacher) ; Miraflores and San Bartola, July 

 10-13, 1938 (Ross and Michelbacher). 



Remarks. — Known only from Lower California and uncommon in 

 collections. Not close to anj^ other species of the genus in either 

 external characters or male genitalia except the new species L. penin- 

 sularis, described herein. 



The specimens from Triunfo are more sparsely pubescent on the 

 abdomen than are those from either Miraflores or San Bartola, but 

 the genital and other characters appear to be essentially similar in ail 

 the specimens. 



PHYLLOPHAGA (LISTROCHELUS) PENINSULARIS, new species 



FiGCRE 3, h, i 



Male. — Small, wider behind, above with sparse and short erect 

 hair, that of the thorax minute ; color rufocastaneous and shining, the 

 thorax more rufous. Head with entire surface of front coarsely and 

 variolately punctate; transverse carina of the vertex very sharply 



