REVISION OF LISTROCHELUS — SAYLOR 75 



subapical). Genitalia as in figure 13, c, d. Otherwise similar to the 

 male. 



Length. — 15-16.5 mm. Width. — 7-8 mm. 



Type. — Female, from Cape San Lucas, in the LeConte collection. 



Specimens examined. — Males, 116; females, 74. Lower Cali- 

 fornia: San Felipe, August (Beyer) [U.S.N. M.j and [Robinson]; 

 Santa Rosa [U.S.N.M.]; 6 miles north of Triunfo, July 15, 1938 [Ross 

 and Michelbacher] ; Triunfo, July 15, 1938; San Bartola, July [Say- 

 lor]; 5 miles west of San Bartola, July 13, 1938 [Ross and 

 Michelbacher]; 3 miles north of San Pedro, Jidy 6, 1938 [Ross and 

 Michelbacher] . 



Remarks.— The majority of the specimens are those collected by 

 Ross and Michelbacher and are the first adequate series ever assembled 

 for study; previously the species was known in the major collections 

 of the country by less than two dozen specimens. The pygidium of 

 the female varies somewhat within the species and may be evenly 

 convex or convex and slightly and longitudinally impressed. 



PHYLLOPHAGA (USTROCHELUS) CARMINATOR (Horn) 



Figures 5, a-c; 13, g, h 



Listrochelus carminator Horn, Proc. California Acad. Sci., ser. 2, vol. 4, p. 398, 

 1894. 



Male. — Very similar in most respects to densicollis, differing most 

 conspicuously as foUows: Thoracic disk less densely punctate and 

 usually with an impunctate area; transverse clypeal carina less densely 

 punctate. The genitalia in an en /ace-dorsal view are slightly to 

 strongly expanded outwardly, whUe the upper tooth as viewed laterally 

 is fairly short, as is shown in figure 5, b, c. 



Female. — Essentially the same as in densicollis, but with the thorax 

 densely punctate and never rugosely so ; the dorsal genital plate in 

 lateral view is always smooth. The pygidium is variable, with the 

 center of the disk always gibbose, frequently the gibbosity slightly 

 to moderately flattened at the middle and at times with traces of a 

 longitudinal sulcus. Genitalia as in figure 13, g, h. 



Length. — 15-17 mm. Width. — 7-8 mm. 



Type. — Male, from "San Jose del Cabo," in the Horn collection. 



Specimens examined. — Males, 24; females, 25. Lower Califor- 

 nia: Santa Rosa [U.S.N.M.]; San Felipe, July 10, 1938; Santiago 

 on July 8, 1938, and 10 miles southwest of San Jose del Cabo on 

 July 9, 1938 [all Ross and Michelbacher]. 



Remarks. — Closely allied to L. densicollis but separable by the key 

 characters. The very short upper tooth of the male genitalia is a 



2198.55 — 40- 



