Mar., 1920] Generic Affinities oj Certain Cicadellidce 161 



with Xestocephalus, Memnonia, Drionia and Nionia as less 

 distinctly related, although these latter genera present in the 

 matter of ocellar location considerable agreement and their 

 differences are due to varied development of the vertex. 



Drionia nigra Ball. 



This very interesting species described from Medford, 

 Oregon, may be recorded also from Mt. Shasta, Cal., a single 

 specimen collected by Mr. Geo. Franck and kindly loaned to me 

 by Mr. Chris. Olsen, agreeing perfectly with Ball's description. 



Nionia Ball. 



This genus as indicated by Ball is very near to the old 

 world genus Tartessus but differs in the absence of supernumary 

 cell in the wing. It is a very robust form with strongly angled 

 head but very short vertex which narrows decidedly between 

 the apex and the eye. 



It is represented in the South American fauna by a species 

 that closely resembles our palmeri but my specimens from 

 Coroicas Yungas, Bolivia, show wide variation in size and many 

 of the individuals have the elytra distinctly brown instead of 

 black. 



Nionia palmeri VanDuzee. 



This species is fairly, common in the Eastern U. S. but not 

 taken very commonly as it has evidently a distinctly restricted 

 habitat. I have adults and nymph from Greensburg, Pa., 

 kindly sent to me by Rev. M. Wirtner, and have also specimens 

 from various points in Ohio, Maryland and Virginia. 



The nymphs associated with the adults and very clearly 

 belonging to this species are very robust creatures but little 

 longer than wide, the head very short and broad, wider than the 

 pronotum, with prominent eyes, polished but finely granulate, 

 the pronotum short, more than twice wider than long, rugose, 

 the meso- and meta-thoracic segments between the wing pads 

 rough and with low median carina. The color is black except 

 the eyes which in dry specimens are, like the adults, of a dead 

 gray color, contrasting with the shiny polished body of jet 

 black. Length, 2 mm. 



