230 An7ials Entomological Society of America [Vol. XII, 



Pronotum more elongate than in C. antennator, with each lateral angle 

 elevated, expanded, irregularly'' armed with three to five large subequal 

 teeth, anterior and posterior lateral margins with several smaller teeth; 

 posterior angles each with flat triangular tooth. Scutellum unarmed. 

 Mesosternum and metasternum, in part, deeply sulcate. Posterior 

 tibiae shorter than femora. All femora armed with short spines near the 

 apex. 



Color black, marked with dark ferrugineous. Head black abo\'e, 

 ferrugineous beneath, with a rufescent vitta below each eye, rugose; 

 antenniferous tubercles wide, adjacent, black. Antenna black, iinmacvi- 

 late, except that second seginent is ferrugineous; rostrum scarcely 

 attaining posterior coxae. 



Pronotum and scutellum black, pubescent, and very rugose, former 

 with narrow, scarcely perceptible median line paler and slightly sulcate. 

 Corium ferrugineous. Membrane sooty black. Venter and legs 

 dusky ferrugineous. 



Cotypes: Two males, captured at Cabazon, California, by 

 Dr. E. D. Ball, and now in his collection. 



In the presence of spinose callosities behind the eyes, this 

 species approaches Plapigus, while the parallel sided basal 

 antennal segments and the shape of the pronotum indicate 

 Chariesterus as the proper genus. 



C. antennator is the only species which is likely to be con- 

 fused with halli as all the others possess a single long spine at the 

 humeral angles. The species here described is more slender 

 than antennator, a deeper black in color, and with the lateral 

 angles of the pronotum expanded and elevated and armed 

 with four or five large teeth. The tubercle behind the eye is 

 more prominently spinose than in any other species of the 

 genus. 



