76 PROCEEDINGS OF THE NATIONAL MUSEUM vou 89 



good distinguishing character. The rugosity of the thorax varies 

 somewhat in carminator, as well as in densicollis and michelbacheri, 

 but most specimens will readily fall into the proper couplets in the 

 keys. 



PHYLLOPHAGA (USTROCHELUS) MICHELBACHERI. new species 



FiGUHEs 5, g, h; 13, a, b 



Male. — Very similar in all characters to carminator, except as fol- 

 lows: The genitalia in lateral view (fig. 5, g, h) have the upper and 

 lower teeth of approximately the same size, while in en /ace-dorsal 

 view the genitalia are expanded outwardly toward the sides, and the 

 upper teeth are much longer than in carminator. 



Female. — Exactly similar to carminator, except that the pygidium 

 is convex at the base, with the apical half strongly flattened to 

 faintly concave, and smooth. In lateral view the dorsal plate of the 

 genitalia (fig. 13, a, 6) is suddenly declivous just before the apex. The 

 thoracic disk is densely punctate and highly polished, but never 

 rugose. 



Length. — 14-17 mm. Width. — 7-8 mm. 



Types. — Holotype male and allotype female are from "20 mi. N. 

 of Comondu, Lower California, collected VII-23-38 by Ross and 

 Michelbacher" and are in the California Academy of Sciences. Para- 

 types are in the collections of the California Academy of Sciences, 

 U. S. National Museum (No. 53759), Messrs. Ross and Michelbacher, 

 Mont Cazier, and in the Saylo rcollection. Named in honor of the 

 collector, Dr. Abe Michelbacher, of the University of California, 

 Department of Entomology. 



Paratypes: Males, 61; females, 30. Lower California: 20 miles 

 north of Comondu, July 23, 1938; 15 miles west of La Paz, July 5, 

 1938; Venancia, July 17, 1938; 15 miles west of San Ignacio, July 26, 

 1938; San Domingo, July 19, 1938; 15 miles north of El Refugio, 

 July 4, 1938; 12 miles south of Santa Rosalia July 27, 1938; and 25 

 miles south of San Rosalia, July 25, 1938 (all Ross and Michelbacher) ; 

 Palmarita, September 1923 (Wm. Mann) [U.S.N.M.j. 



Remarks. — The pygidium of the female is very characteristic and 

 will set off this sex immediately from the others of the complex. The 

 male is most readily distinguished by the use of the genital characters 

 since the external characters are close to those of carminator and 

 densicollis and are less obvious without careful study. 



PHYLLOPHAGA (LISTROCHELUS) PILOSIPES. new name 



Figure 11, l-n 



Listrochelus puberulus LeConte, Smithsonian Misc. Coll., vol. 6, p. 78, 1863 

 (homonym of puberulus du Val, 1851). — Horn, Trans. Amer. Ent. Soc, 

 vol. 7, p. 142, 1878. 



