Mar., 1920] Generic Affinities of Certain CicadellidcB 163 



Key to North American Dorydiaria. 



A. Head margin usually acute often very thin and foliaceous. 

 a. Veins of clavus fused for the apical third. 



b. Vertex very long sides nearly parallel with a median carina.. Dorycephalus 



bb. Vertex little longer than wide, triangular, furrowed Neoslossonia 



aa. Veins of clavus not fused apically. 



c. Clavus with a single vein. Spangbergiella 



cc. Clavus with two veins. 



d. Ocelli at or near the border of the eye. 

 e. Costal veins not reflexed. 



f. Head very broad with foliaceous margins Hecalus 



ff. Head narrower paraboloid or subtriangular Parabolocratus 



ee. With reflexed veins on costa opposite outer anteapical. 



g. Head rounded in front, clavus with ramose veins. .Dicyphonia 

 gg. Head acutely pointed, clavus with cross nervure. .Acurhinus 

 dd. Ocelli remote from the border of the eye. 

 h. Elytra rounded at apex. 



i. Vertex as long, or longer than wide. 



k. Elytra long, anteapical cells long, vertex not 



spoonshaped Huleria 



kk. Elytra shorter, anteapical cells short, vertex 



spoonshaped Cochlorhinus 



ii. Vertex wider than long Uhleriella 



hh. Elytra acute at apex Dorydiella 



_AA. Head margin rounded or obtuse, not flattened, 

 a. Vertex longer at middle than next the eye. 



b. Ocelli close to eye Memnonia 



bb. Ocelli distant from eye Xestocephalus 



aa. Vertex very broad, eyes widely separate, head wider than pronotum. 



c. Vertex much produced, angular, pronotum extending before eyes.Nionia 

 cc. Vertex transverse, short, pronotum not greatly produced Drionia 



Deltocephalus viridis n. sp. 



Light green, broad and short, occurring in long and short 

 winged form; length 2.5 to 3 mm. 



Vertex nearly as long as broad, about twice as long in the middle 

 as next the eye, obtusely angulate, margin angularly rounded, front 

 broad, the sutures curving slightly to the base of the clypeus, rather 

 full; the clypeus short, lateral margins curved; the lora? divided below, 

 distinct from the margins of the cheek, the border of the cheek nearly 

 straight from the eye to the clypeus; pronotum about twice as wide as 

 long, smooth, lateral borders short; posterior margin very slightly 

 concave; scutellum broad, short, impressed on the middle; elytra of 

 the brachypterus form reaching the ]Denultimate segment, broadly 

 rounded behind, divergent on the dorsum, the apical cells much short- 

 ened, discal cells shorter but in the normal position; the wings about 

 half the length of the elytra, very delicate; the cells usually bordered 

 with faint fuscus markings. 



Color: Light grass green; the vertex with faint dusky markings 

 near the anterior border, the front with about four dusky arcs each side ; 

 the beak brown, anterior and middle femora annulate with brown, and 

 the tarsal spurs black; elytra either hyaline or with faint fuscus mark- 

 ings bordering the cells. 



