254 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Seb. 



quite attaining the first segment, their outer margin armed with a median 

 tubercle, which becomes a small spine in the female ; vertex with a smooth, 

 depressed vitta either side, thus leaving three rounded granulated ridges. 

 Eyes as in dusci, prominent, without a post-ocular tubercle. Antennae 

 rather slender, nearly as long as the head and pronotum united ; first seg- 

 ment a little longer than wide ; second moderately narrowed to the base ; 

 third and fourth together scarcely longer than the second, becoming slightly 

 thinner apically ; fourth three-fourths the length of the third. Pronotum 

 short, the expanded sides forming an angle at the humeri, the latero- 

 anterior margins rectilinear, the latero-posterior nearly so, these margins 

 with about five rather large teeth anterior to the humeri and some finer 

 granulations posteriorly ; posterior excavation shallow ; the six dorsal 

 carinas prominent, the lateral abbreviated at the expanded margin ; mar- 

 ginal carina of the scutellum much elevated. Elytra about as wide as in 

 ducci, attaining the apex of the ultimate tergal segment. Margin of the 

 abdomen evenly rounded, with but a small notch at each incisure genital 

 plate truncately rounded, unarmed. 



Color dark fuscous brown ; basal segment of antennae touched with 

 ferruginous; third segment pale yellowish, with its immediate base black; 

 apex of the last segment clothed with pale hairs ; hind edge of the pro- 

 notum touched with ochraceous ; expanded latero-anterior margins with 

 an elongated white spot. Scutellum black at apex, the marginal carina 

 with a median white mark. Elytra whitish, varied with black, especially 

 toward the apex, the extreme tip black. Membrane pale fuscous, varied 

 with whitish. Coxae, trochanters, knees, tibiae in large part and base of the 

 tarsi pale. Abdomen dark castaneous varied with blackish and tinged with 

 coppery green at apex. 



Female : Abdomen broader and more ovate, expanded margins of the 

 pronotum more broadly rounded, second antennal segment more swollen, 

 oval white spots on the pronotal margins larger and the general color paler 

 than in the male. The abdomen of the female is bright castaneous, with 

 the margins and a squarish spot within on each segment whitish, and the 

 venter is marked with a squarish black spot, ocellate with bluish, on either 

 side of the third, fourth and fifth segments, about which the general color 

 is paler. Legs pale, the femora and tibiae biannulate with fuscous ; genital 

 plates rather narrow and a little sinuated at apex. 



Described from a male taken by Mr. Giffard in Niles Can- 

 yon, May 23, 1917, and a female taken in the hills near 

 Claremont, Calif., by a Mr. Metz, and sent to me for study 

 by Dr. Hilton of Pomona College. 



Holotype (No. 329), male, in collection of the California 

 Academy of Sciences. 



Allotype, female, in the author's collection. 



32. Aradus behroisi (Bergr. ) Summit, July, 1907, one 

 example. 



33. Aradus litgubris Fall. Near Hoberg's Resort, August 

 2, 1916. 



34. Aradus falleni Stal. Mt. Tamalpais, 1300 feet, Au- 

 gust 16, 1916. 



