Cincinnati Society of Natural History. 



Uhler, to Platymetopins of the forms with short vertex. 

 Indeed it seems probable that the genus is an offshoot of 

 Deltocephalus, which view is further strengthened by the fact 

 that it is strictly American in its distribution, and has a much 

 more restricted distribution than Deltocephalus. 



On the other hand some of the species show affinities with 

 Par ante sus, Eutettix, and Phlepsius. 



As used in this paper the characters of most importance 

 are the deeply sinuate occiput, the long antennae, the large 

 lorae, approximate to margin of cheeks (except in sanctus 

 group), the narrow vertex, the width and length of which are 

 usually about equal, and the recurved nodal or costal veins. 

 The clypeus is usually widened at tip, and for the more 

 typical members of the genus the outer ante-apical cell is 

 narrowed behind, becoming pointed, and, in some species, 

 stylate. 



The characters found to be most available in separating 

 the species are in the genitalia, the elytral veins, especially 

 those of the nodal region, and the shape of the vertex. The 

 latter are perhaps most constant, and have been relied on 

 where other characters have seemed too variable to afford 

 definite results. The separations into the principal divisions 

 are easily made, and the affinities indicated seem well fixed. 

 Not so much can be said regarding the minor divisions, 

 especially the species grouped together in the immistus 

 division. The use of the claval veins, though affording the 

 best basis apparent in material in hand, may be found insuf- 

 ficient in larger series. It is hoped that they may at least 

 serve a useful purpose in facilitating the recognition of sev- 

 eral species, the precise limits of which are rather difficult to 

 define. 



It appears to me that the affinities of the genus are more 

 nearly with Deltocephalus and Platymetopius than with the 

 Athysanini of Van Duzee, for while the second cross vein is 

 usually wanting, the eyes are placed near together, so the 

 vertex is but little wider than long, and in some cases even 

 longer than wide. 



The species occur in wooded places, and probably occur 

 for the most part on trees or shrubs, as those species for which 



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