245 



joint broadly flattened, narrowed to the base, the apex oblique; second joint 

 larger, subterete, nearly as wide as the first; its surface, except at base and 

 the outer edge of the first joint coarsely papillated. Pronotum deeply exca- 

 vated behind, strongly carinated, the lateral carinae distinctly incurved at 

 apex. Sides of the scutellum strongly concave, the apex prominent, large. 

 P>lytral nervures setigerous-punctate. 



This genus is near Conomelus Fieb. but differs in the form of the front; 

 the antennae have the same shape but are more flattened, and the carinae 

 are more prominent. The lateral carinae of the pronotum apparently fork 

 behind, sending one branch to the posterior edge and another behind the 

 eye as in Liburnia. Certainly this is the case in our common tricarinata, 

 Say. 



STOBERA TRICARINATA, (Say.) 



Delphax tricarinatus, Say. Jl. Acad. Nat. Sciences. Phila. IV, p. 337, 

 1825. Complete Writings, II, p. 225. 



Uhler, Bui. U. S. Geol. & Geog. Surv., II, p. 352, 1S76. 



Van Duzee, Psyche, V, p. 389, 1S90, 



Osborn, Proc. Iowa Acad. Sci., I, pt. II, p. 127, 1892. 



Conomelus tricarinatus, Van Duzee, Bui. Buf. Soc. Nat. Sci., V., 

 p. 191, 1894. 

 Gillette & Baker, Hemip. of Colo., p. 69, 1895. 



Color pale yellowish white, vertex and scutellum fulvous, apex of the 

 head with a brown band between the eyes and invading the base of the 

 front. A broad black band crosses the apex of the front and cheeks and a 

 more slender one the base of the clypeus. Apex of the clypeus, femora 

 below and the coxae dotted and the tibiae twice banded with black. Antennae 

 and outer edge of the scutellum dusky. Disc of the tergum and ventral 

 segments black. Elytra whitish hyaline, nervures, the marginal excepted, 

 with black setigerous dots. Base of the clavus, an oblique band before the 

 middle, another across the base of the apical areoles which is deflected so 

 as to cover the inner half of the membrane, and a triangular spot on the 

 outer apical angle, brown. Where the apical nervures terminate in the 

 brown cloud they are marked by a white spot one of which is larger. 

 Length about 4 m. m. 



This is a widely distributed species in North America occurring from 

 Quebec 1o Mississippi and California. In Western New York it is occa- 

 sionally taken in damp situations from May to August. I have also taken 

 it near Ridgeway, Ont and have received specimens from New Jersey, 

 (Smith), Mississippi (H. E. Weed), Kansas, (Snow), Colorado, (Gillette), 

 Iowa, (Osborn), California, (Coquillett), and Virginia, Oct. 3d and 23d, 

 Columbus. Tex., June 6th, (U. S. Natl. Mus.), Mr. Uhler records it from 

 Illinois, Nebraska and Missouri, and Say's specimens were from Missouri. 

 In the mountains of Colorado and California a shorter winged form seems 

 to predominate. The extent of the dark markings is subject to some varia- 

 tion in this species. 



