162 



The Ohio Journal of Science [Vol. XX, No. 5, 



The character of the nymph emphasizes the distinctness of 

 this group from the other Jassinae and if similar nymphs are 

 found in Drionia and related genera would warrant the creation 

 of a new division, separate from the Dorydiaria or Deltoceph- 

 alaria, to receive them. 



The division Dorydiaria of the tribe Jassina as placed by 

 VanDuzee for North America includes for the most part genera 

 in which the ocelli are directly on the margin of the head, 

 between vertex and front and with heads flattened, the margin 

 acute or foliaceous but including some forms in which the 



N.p o\\v\e.x<\ 



Fig. 6. Nionia palmeri. a, dorsal view of female; b, male genitalia; c, nymph. 

 (From drawings by Mr. J. D. Smith.) 



latter character is modified. While not a homogeneous group 

 and, as constituted, including some genera which may well be 

 subject to further study the following key is offered as an 

 assistance in recognizing the generic affinities for the North 

 American forms. 



The group may be separated from Acucephalini by the fact 

 that the ocelli are on the margin, not just behind it and from 

 the Deltocephalaria by a greater overhang of the vertex on the 

 front a character shared in some degree by some of the species 

 of Phlepsiiis. 



