"General: Body 1.66 to 1.80 times as long as wide; dorsal surface moderately shining, lacking pubescence, ventral surface with short, sparse, whitish pubescence. Head: Dull light orange, vertex and antennal insertions darker orange; front with rather small, indistinct punctures; clypeus flat, sides sharply delimited, less distinctly so at base, distinctly broadest apically; antennae of male as long as body, those of female about two-thirds as long as body, orange to light brownish throughout. Pronotum: Basic color light orange; male with four longitudinal dark reddish stripes, not sharply delimited, often a little abbreviated and somewhat irregular, outer two may be interrupted medially; female with development of dark markings variable, sometimes with four rather abbreviated, irregular stripes, usually much reduced, often with traces of stripes or just basal traces of outer stripes (holotype), or absent; punctation usually dual, with small punctures dense, larger punctures rather large and slightly to distinctly coarse, sometimes with larger punctures very coarse and surface rather rugose and obscuring small punctures. Elytra: Light orange with punctures dark reddish to nearly black. Punctures best developed in some males, these with seven or eight rather easily traced rows; most males and nearly all females with punctures quite confused and forming distinct rows only apically, sometimes basally also; adjacent discal punctures sometimes irregularly connected by pigment; punctures smaller at apex; inner and outer rows distinct and usually clearly meeting. Ventral surface: Nearly uniformly light orange throughout, legs with apices of femora more or less light orange, remainder of legs darker orange to nearly reddish; prosternum of male with anterior margin produced into a broad lobe, female with anterior margin feebly, broadly produced; pygidium longitudinally carinate, light orange, rather coarsely punctate. Length: 4.1 to 5.0 mm" (White, 1968: 37-8).
"The species is separable from its nearest relative duryi by the development of the pronotal stripes and the elytral punctures. In duryi, the pronotal stripes are sharply dehmited and complete; in binotatus, they are irregular and less sharply delimited to incomplete, much reduced, or even absent. The elytral punctures of duryi are quite large, confused, and have only faintly evident (or no) traces of alignment into rows. There is a tendency toward lateral interconnection of the discal punctures by reddish pigment. The elytral punctures of binotatus are smaller, distinctly aligned into rows at least apically, sometimes also basally (and even throughout in some males), and the punctures are infrequently interconnected by pigment. This species is named for the type which has two dark pronotal spots" (White, 1968).
USA: Yuma, AZ; Winterhaven, CA (White, 1968).