REVISION OF THE AMERICAN LEAF HOPPERS OF THE 

 JASSID GENUS TYPHLOCYBA 



By W. L. McAtee 



Of the United States Biological Survey 



INTRODUCTION 



The genus Typhlocyha is one of a group of leaf hoppers which 

 seem naturally allied by their small size, frail structure, reduction 

 of tegminal venation, and usual absence of ocelli. However, the 

 most ajDpropriate rank for this group, and its definition, are debat- 

 able points. Certainly prior definitions of what is here called the 

 subfamily Eupterygintx3 including that^ of the present writer must 

 be abandoned. Contrary to previous conceptions certain members 

 of the group have ocelli,- and others have anteapical cells in the teg- 

 mina." There is no basal sutural line defining the front from the 

 vertex and the lateral sutural lines bounding the front are evanes- 

 cent basally. In Baker's key of 1923* the members of this group 

 run to the family Jassidse, What the scope of the group should be, 

 and its proper definition are matters of far from exact knowledge 

 at present. However, the general characters mentioned in the 

 first sentence and the reduction of claval veins to one or usually 

 to none are aids to recognition of the leaf hoppers we now call 

 EuiDteryginse. 



For recognition of the genus I'yphlocijha within the subfamily 

 the following characters should be verified: Wing has two apical 

 cells and no submarginal vein; tegmen has no appendix, nor ante- 

 apical cells, the third apical vein curves so as to join radial margin 

 of tegmen about half way between fourth crossvein and apex of 

 tegmen and the second apical cell usually is more or less stalked 

 (pi. 1). The vertex usually is between rounded and angulate, and 



1 Proc. Diol. Soc. Wash., vol. 31, p. 110, November, 1918. 



2 McAtee, W. L., Florida Entomologist, vol. 8, Nos. 3-4 (December. 1924), February, 

 1925, pp. 34-35. 



« Baker, C. F., Psyche, vol. 8, p. 403, September, 1899. 



* Baker, C. F., Philippine Journ. Sci., vol. 23, No. 4, pp. 351-353, October, 1923. 



No. 2619.— Proceedings U. S. National Museum. Vol. 68, Art. 18 



796.54—26 1 1 



