196 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



E.2 Tegmina not exceeding the abdomen, even in the male. 



F.^ Lateral foveolae of the vertex linear and distinct (Fig. 6); tegmina 



quite unspotted ; inner spurs of the posterior tibiae e'qual 



6. — Napaia, n. gen. 



F.2 Lateral foveolae less distinct and sub-triangular or obsolete ; teg- 

 mina more or less distinctly spotted as well as the face and prono- 

 tum ; inner tibial spurs very unequal, the longer but little shorter 

 than the first tarsal joint 7. — Oreiiia, n. gen. 



C.2 Antennae never triquetrous (Fig. 4a), sometimes plainly depressed 

 basallyand acuminate (Fig. 5a), most commonly filiform (Fig. loa), 

 rarely clavate (Fig. 9a) ; pronotum with the lateral lobes less dis- 

 tinctly vertical, with the lateral carinae very rarely quite straight, 

 but gently (Fig. 12a) or strongly (Fig. loa) sinuate near the mid- 

 dle, median carina of the pronotum generally cut in or not far 

 behind the middle. (Figs. 9a, loa.) 



D.' Tempora either foveolate or plain, not visible from above. (Figs. 

 7a, 8a, I la.) 



E.' Scutellum of the vertex with a distinct median carina which is 

 usually a coarse raised line stronger anteriorly. (Figs. 7a, 8a, i 2a.) 



F. ' Spurs on the inner side of the posterior tibi^ very unequal, the 

 apical sjjur being twice as long as the other (Figs. 8 and 9) ; an- 

 tennae very greatly exceeding the head and pronotum. 



G.' Antennae depressed basally and distinctly acuminate. No supple- 

 mentary carinas (compare Fig. 9a) present either upon the head or 

 disk of the pronotum S. — PcdcticiDii, n. gen. 



G.' Antennae depressed apically and somewhat clavate. Supplement- 

 ary carinae accompanying the median carina upon either the head 

 or the disk of the pronotum. (Fig. 9a) 9. — Eritettix, Bruner. 



F.2 Spines of the inner side of the posterior tibiae about equal in 

 length. (Fig. 11.) 



G.' Spines on the exterior margin of the posterior tibiae 19-21 



10. — Syrlnila, Stal. 



G.^ Spines of the exterior margin of the posterior tibiae not exceeding 15. 



H.J Median carina of the pronotum cut in the middle by the princi- 

 pal sulcus. 



L^ Color striped distinctly or obscurely. Scapular area of the tegmina 

 broader than the mediastine area. (Fig. 11.) 



J.I Lateral carinae of the pronotum obsolete, median carina accom- 

 panied by a supplementary pair upon the disk. (Fig. iia) 



1 1 . — Amphitornus, n. gen. 



