156 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.87 



than twice or barely twice as broad as long. The shape of the pro- 

 thorax places this species, together with two hitherto undescribed 

 ones, apicalis and brisleyi, in a separate group. These three have 

 another point in common — the claws are not simple in the female, as 

 in most species of Monoxia, but have a small tooth, maldng them 

 indistinguishable from the males in this respect. The abdomen of 

 the male does not appear so trimcate as in most species of Monoxia. 

 The only other species of the genus known to the author having this 

 latter characteristic is the eastern M. batisii, which also somewhat 

 resembles the sordida group in the shape of its prothorax. M. batisii, 

 however, has simple claws m the female. 



As in most species of the genus, there is great variability in markings. 

 Some specimens are entirely pale or with only faint reddish-brown 

 spots, while others are heavily and darkly marked. The Texas 

 specimens are large and have unusually long pubescence. Possibly 

 these eastern colonies represent a different species or subspecies. 

 Some of the Arizona specimens are also large, and are very dark, 

 while others are tiny and pale, resembling the Colorado Desert speci- 

 mens of LeConte. While the general shape of the aedeagus remains 

 the same in all, there is considerable variation in this structure even 

 in a series from a single locality. More study of a greater amount 

 of material is necessary before the status of this widespread and var- 

 iable species can be satisfactorily worked out. 



In Arizona a small pale series has been reported as feeding on Gutier- 

 rezia sarothrae, "the larvae and adults equally severe in destroying 

 the foliage completely in some badly infested areas" (C N. Ainslie). 

 H. R. Brisley has collected a large dark series on Lycium pallidum in 

 Arizona, and another specimen, much smaller but also dark, on Gutier- 

 rezia sarothrae. At Thermal, Calif., H. O. Marsh bred a small dark 

 series on Dondia sp. Dr. E. P. Van Duzee, at the type locality, col- 

 lected typical specimens on Atriplex lentiformis. 



Specimens have been examined from Texas (Brownsville, Del Rio, 

 Corpus Christi, Sabinal), Arizona (Catalina Springs, Santa Rita 

 Mountains, Oracle, Tucson, Tempe, Winslow), Utah (Salt Lake, 

 Kelton, Cisco), Colorado (Delta, Rocky Ford), Nevada (Humboldt 

 Lake), California (Fort Yuma, Thermal, Los Angeles, San Diego, 

 Needles), Baja California (Agua Verde). 



MONOXIA ANGULARIS (LeConte) 



Plate 18, Figure 2 



Galleruca angularis LeConte, Proc. Acad. Nat. Sci. Philadelphia, vol. 11, p. 90, 



1859. 

 Monoxia angularis LeConte, Proc. Acad. Nat. Sci. Philadelphia, vol. 17, p. 221, 



1865. 

 Monoxia consputa Horn, Trans, Amer. Ent. Soc, vol. 20, p. 85, 1893 (in part; 



not LeConte, 1865). 



