A STUDY OF THE GENUS MONOXIA — ^BLAKE 165 



tains, Glendale, Hot Springs, Sacaton, Winslow); Utah (Salt Lake); 

 Nevada (Esmeralda County, Pyramid Lake); Colorado, Montana, 

 Idaho (Bruneau, Parma, Succor); Oregon (Adrian). 



Food plants. — Kafircorn (Sorghum vulgare var. caffrorum); Atriplex 

 canescens (C. N. Ainslie) ; Chenopodium sp.; sugar beet {Beta vulgaris). 



Remarks. — This species, approaching in size M. angularis, guttu- 

 lata, debilis, inornata, and grisea, the largest species of the genus, is 

 at once differentiated from them by its finer and shallower punctation 

 and its slenderer antennae. In its convexity and comparative lack of 

 pronotal and elytra! depressions it is similar to debilis. The head in 

 this species appears unusually broad in relation to the prothorax, 

 which is not much wider, in contrast to such species as M. angularis, 

 in which the prothorax is nmch wider than the head. The aedeagus 

 is unUke that of any other species of the genus, being short, broad, 

 and with a broad, rounded tip. 



A series of specimens from Salt Lake, Utah, is considerably smaller 

 and darker but otherwise not distinguishable from the usually large 

 and entirely pale Arizona and New Mexico specimens. There is a 

 series from Sprekels, Calif., that has much denser elytral pubescence, 

 which entirely conceals the punctation below. In these the aedeagus, 

 while of similar shape, is even broader. It is not clear whether these 

 California specimens represent a geographic race or subspecies of 

 elegans or possibly a distinct species. Specimens from Adrian, Oreg. 

 (on the border between Idaho and Oregon), Idaho, and Montana do 

 not differ from the Arizona and New Mexico ones. 



MONOXIA PUBERULA. new species 



Plate 19, Figuke 14 



Medium sized (about 3.5 mm.), slender, not depressed, with a 

 narrow prothorax, pale yellow-brown with few pale reddish-brown 

 markings, and with rather finely punctate and somewhat shining 

 elytra covered with short, inconspicuous pubescence. Head with pale 

 lower front, the color gradually deepening over the occiput; labrum 

 and median vertical line darker. Punctation shallow and obscured 

 by pubescence. Antennae with paler basal joints. Prothorax dis- 

 tinctly less than twice as broad as long, with arcuate, sometimes 

 angulate, sides and a small tooth at the basal angle ; disk not greatly 

 depressed, often with only a slight median channel and not marked 

 lateral depressions; densely but shallowly punctate with short, in- 

 conspicuous pubescence; sometimes entirely pale, sometimes with 

 reddish-brown Y-shaped median mark and two lateral spots. Elytra 

 elongate, not depressed, with a short intrahumeral sulcus, densely and 

 shallowly punctate, and with short, fine, not at all conspicuous 

 pubescence; surface somewhat shining, sometimes entirely pale, or 



