166 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.87 



with faint reddish-brown humeral spot and traces of subsutural vitta 

 and lateral spots, seldom with heavy black markings. Body beneath 

 and legs pale, metasteraum occasionally a little darkened; finely 

 pubescent. Length, 3.5 to 4 mm.; width, 1.5 to 1.8 mm. 



Tyye, male, and 44 paratypes, U. S. N. M. No. 44024, collected by 

 D. K. Duncan, July 1931. Paratypes also in collections of Museum 

 of Comparative Zoology, Illinois State Natural History Survey, 

 Kansas University, California Academy of Sciences, Colorado Agri- 

 cultural College, F. S. Carr, D. K. Duncan, C. A. Frost, H. R. Brisley, 

 M. H. Hatch, and Ralph Hopping. 



Ty^e locality. — Wheatfields, near Globe, Ariz. 



Distribution.— Texas (Marathon, Marfa); Arizona (Bowie, Bright 

 Angel, Cliiricahua Mountains, Globe, Skull Valley); New MexicO' 

 (Alamogordo, Sacramento Mountains) ; California (Mountain Spring);. 

 Colorado (Boulder, La Junta, Wliite Rocks, Boulder Coimty) ; Utah 

 (Salt Lake); Alberta (Medicine Hat). 



Food plants. — Gutierrezia sarothrae (H. R. Brisley), Gutierrezia sp.. 

 (F. S. Carr); Lepidium alyssoides (J. D. Mitchell and R. A. Cushman,. 

 at Marfa, Tex.). 



Remarks. — Tliis slender, pale, medium-sized species, evidently 

 abundant in western Texas, Arizona, and New Mexico and extending 

 north to Alberta, is distinctive in being one of the least pubescent of 

 the genus. F. S. Carr wrote that when alive the beetles are a "beau- 

 tiful translucent light yellow." The elytral punctation, although 

 dense, is shallow and fine, and the pubescence is very short and in- 

 conspicuous, so that the elytra appear smoother and more shining 

 than in the other species. Of about the same size as Af. consputa, 

 it is not so distinctly punctate a species and is slenderer, with a 

 narrower prothorax, and is not depressed. A specimen of puberula 

 is in the LeConte collection in the series under debilis. It has been 

 reported from both Arizona and Alberta as feeding on species of 

 Gutierrezia. 



MONOXIA SCHIZONYCHA. new species 



Plate 19, Figure 16 



Medium sized (about 4 mm.), slender, pale yellow-brown, usually 

 with darker reddish-brown humeral spot and traces of subsutural 

 vitta, occasionally hea\dly marked with spots and lateral infuscation; 

 elytra rather coarsely and deeply punctate and with short, fine pubes- 

 cence; claws in both sexes toothed. Head with paler lower front, 

 gradually deepening in color to darker yellow on occiput; labrum 

 and median line dark; punctation dense, pubescence dense and 

 appressed. Antennae paler at base. Prothorax scarcely twice as 

 broad as long, with rounded sides and small basal tooth; punctation 



