112 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



dimorphic, some of them being hke the males in color. I have 

 carefully studied the types of both Provancher's and Uhler's 

 species (cofigre.v) and they seem to be absolutely identical. 



20. Orthotylus marginatus Uhler. 



Closely allied to dor salts, but with the females colored dark 

 like the males and with different male genital characters. 

 Length 5 3/2 mm. to tip of membrane. 



Vertex but little flattened, with a slight depression before 

 the feeble basal carina; front but slightly convex, polished; 

 clypeus small and less prominent than in most of our species. 

 Eyes unusually large; viewed from the side br®adly ovate, 

 reaching nearly to the gula, very little smaller in the female 

 than in the male. Pronotum almost smooth, the sides dis- 

 tinctly concave, the anterior angles well rounded; callosities 

 prominent, usually connected anteriorly by a slight ridge. 

 Basal lobe of the scutellum well exposed. Elytra long, nearly 

 parallel, the costal margin but feebly arcuated; apex of the 

 abdomen reaching the middle of the cuneus in the male and 

 nearly to its tip in the female. Upper surface rather sparsely 

 clothed with pale appressed hairs. Rostrum long, reaching 

 well on to the hind coxae. 



Dextral hook of the male genitalia large, pale, reaching 

 nearly across the anal opening, its apex obliquely rounded and 

 armed with a few comb-teeth, near the base produced dorsally 

 and backward in a sinuated acute projection which is about 

 one-half as long as the lower member ; sinistral hook long, flat- 

 tened and expanded at the rounded apex, produced for one^ 

 half its length beyond the ventral apex of the genital segment. 



Color as in the male of dorsalis, black; occiput, lower 

 cheeks, gula, base of the vertex, median vitta of the pronotum, 

 at times continued over the scutellum, and the sternum, pale 

 or tinged with fulvous; costal margin of the elytra, middle of 

 the venter and the legs pale greenish-yellow. Pale color of 

 the costa sometimes encroaching upon the base of the clavus 

 along its suture and on the principal nervure of the corium in 

 the female, rarely in the male ; inner angle of the cuneus usually 

 infuscated. Membrane blackish with the nervures pale at apex. 



