MCNEILL REVISION OF THE TRUXALINiE OF NORTH AMERICA. 205 



B.' Vertex semi -elliptical rather than triangular with a faint median 

 carina. Lateral carince of the pronotum present and moderately 

 distinct. Posterior margin of the meta/.one hardly perceptibly- 

 rounded 4. — Neomexicana, Thos. 



B.2 Vertex triangular rather than semi-elliptical. Lateral carinae of 

 the pronotum scarcely apparent. Posterior margin of the meta- 

 zone plainly though very obtusely angulate or rounded. 



C' Vertex sub -triangular with the sides generally arcuate and the tip 

 rounded, the median carina not entirely obsolete. The top of the 

 head green with a ferruginous median stripe (at least in the male). 

 Face green with a ferruginous stripe at each side. Median carina 



of the ]>ronotum distinct, the sulci faint but visible 



5 . — Alacris. Scud. 



C.^ Vertex acutely triangular with the sides straight and the tip hardly 

 blunt even in the female, the median carina entirely wanting. 

 The top' of the head with a \ery broad fuscous stripe (at least in 

 the male) which is separated from the post ocular stripe by a green 

 strijie no wider than the latter. Face purj^lish. Median carina of 

 the pronotum less distinct. Sulci obsolete 6. — Rostrata n. sp. 



I. Mermiria BiviTTATA, Serv. 



Opsomala bh'ittata, Serv., 1839. Hist. Nat. Ins. Orth., 589. 



Ofsomala Invittata, Walk., 1870. Cat. Derm. Salt., Ill, 507. 



Opoinala bri'ittata, Thos., 1865. Trans. 111. State .Agr. Soc, V, 447. 



Opomala hivittata, Thos., 1872. Prelim. Rept. V . S. Geol. Surv. 

 Mont., 429. 



Opomala brvittaia, Thos., 1872. Prelim. Rept. U. S. Geol. Surv. 

 Mont., 432. 



Opomala hivittahi, Scud., 1872. Final Rept. L'.S.Geol. Surv. Neb., 

 250. 



Opomala hivittata, Thos., 1873. Syn. Acrid. N.Am., 65, fig. 16. 



Acridiuiii hivittata, Bruner, 1877. Can. Ent., IX, 144. 



Acriiiium hivitattiim, de Haan, 1842. Bijdr. Kenn. Orth., 143. 



Mermiria hivittata. Scud., 1877. Cent. Orth., 47. 



Mermiria hii'ittata, Bruner, 1883. 3d Rept. U. S. Ent. Com., 55. 



Mermiria hivittata, Bruner, 1885. Bui. Wash. Col. Lab. Nat. Hist., 

 I, no. 4, 130. 



Mermiria hivittata, 0'A)oxx\, 1892. Proc. Iowa Acad. Sci., 1890— 

 91,4. 



[Pboc. D. a. N. S., VoL VI.] 26 [December lO, 1896]. 



