Vol. XXVIII, pp. 165-168 November 29, 1915 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



NEW GENERA AND SPECIES OF ACOCEPHALIN^. 



[HOMOPTERA.] 

 BY E. D. BALL. 



In collecting along the Pacific coast at different times the 

 writer has taken a number of new species of leaf-hoppers ap- 

 parently belonging to a closely related group of forms. Most 

 of these insects have been black or dark brown in color with 

 ivory-white markings — a striking color combination and one 

 that is rare in the leaf -hoppers. In working up these forms a 

 general study was made of other black species with the result 

 that it was determined that another black form was incorrectly 

 placed and a new genus is made for it and its South American 

 allies. 



Nionia new genus. 



Closely resembling Tartessus of Stal, but not possessing a supernumer- 

 ary cell in the wing. Superficially resembling Pediopsis in general shape 

 of head and pronotum but with the ocelli near the vertex margin. 



Vertex appearing as scarcely more than a line bounding the conically 

 produced anterior margin of the pronotum, except at the apex where it 

 is conically produced and appears to be twice the length next to the eye, 

 anterior margin rounding almost inperceptibly to front. Front broad, 

 convex in both diameters forming with the vertex and pronotum a blunt 

 cone. Ocelli just under the vertex margin, nearly as far from the eye as 

 from the apex of vertex. The lateral margins of front broadly rounding 

 into the vertex margin above and the long narrow clypeus below. Surface 

 especially along the side rather coarsely wrinkled. Pronotum excep- 

 tionally long, due to the conically rounding anterior projection, extend- 

 ing over one-half its length into the head. Posterior margin broadly 

 rounding with a slight median emargination. Surface finely wrinkled. 

 Elytra coriaceous, moderately long with narrowly rounding apices. All 

 veins margined with lines of punctures giving a double-veined efiect on 



34— Proc. Biol. Soc. Wash., Vol. XXVIII, 1915. (165) 



