164 PROCEEDINGS OF THE NATIONAL MUSEUM vol.85 



margins of the cro^Yn and because the hind wings of macropterous 

 forms have four apical cells rather than three as in the Cicadellinae. 



The Errhomenellini and the closely related Evacanthini may be 

 distinguished from other Jassinae by the position of the ocelli, which 

 are on the crown near the anterolateral margins, and the shape of the 

 facial sclerites, especially the clypellus, which is unusually large, 

 broad basally, narro^^ed distally, and extending beyond the genae. 

 The apex of the clypellus is rounded, not truncate, and the entire 

 face is usually rather broad. The Errhomenellini differ from the 

 Evacanthini in that the clypeus is without a median carina. 



According to my interpretation, the genera ErrhonicncIluH Puton 

 and Bathysm,ato2?horus Sahlberg are not represented in North Amer- 

 ica. For the Nearctic species previously assigned to the former, 

 two new genera have been erected, while the name Lystridea Baker 

 is available for the species referred to the latter. A third new genus 

 is described to accommodate an apparently new species from Idaho. 



KEY TO THE GENERA OF ERRHOMENELLINI 



1. Crown without numerous fine striae Errhomus, new genus 



Crown with numerous fine, mostly longitudinal striae, at least basally 2 



2. Head elongate and rather narrow ; crown always well produced 



anteriorly. Species not especially robust 3 



Head short and broad ; crown not greatly produced anteriorly, 



or if so, then species robust and brachypterous 4 



3. Head subconical and pointed apically. Species macropterous Pagaronia Ball 



Head blunt apically. Species subbrachypterous Friscanus, new genus 



4. Head narrower than pronotum; posterior margin of pronotum 



incised Thatuna, new genus 



Head as broad as or broader than pronotum; posterior margin of 



pronotum not incised Lystridea Baker 



Genus PAGARONIA Ball 



Pagaronia Ball, Can. Ent, vol. 34, p. 19, 1902. 



Relatively large leafhoppers, about 8-10 mm in length. Head, in- 

 cluding eyes, distinctly narrower than pronotum ; apex of head sub- 

 conical and rather sharply pointed; face long and narrow, clypeus 

 and clypellus large; crown irregularly convex, surface with numerous 

 fine, irregular, longitudinal striae, posterior margin distinctly ele- 

 vated above pronotum along its entire width and forming a distinct 

 flange next each eye. Pronotum relatively short and broad; lateral 

 margins carinate and diverging posteriorly; posterior margin shal- 

 lowly incised medially. Fore and hind wings well developed and 

 extending beyond tip of abdomen; central anteapical cell of fore 

 wing usually open basally; appendix small or absent. Hind wing 

 with four apical cells. Pecten of hind basitarsus consisting of six 

 or seven setae of variable size, the first and last of the series spinelike. 



