SUBFAMILY I. TRYXALIX.E. 203 



KEY TO EASTERN SPECIES OF MERMIRIA. 



a. Lateral carinae of pronotum distinct (Fig. 77, c.) ; head of female as 



long as or slightly longer than pronotum (Fig. 78, A.) ; subgenital 



plate of male strongly produced and acuminate (Fig. 77, a.) 



ft. Fastigium triangular, its sides nearly straight and tip narrowly 



rounded (Fig. 77, e.) ; tegmina largely green; hind margin of 



pronotum slightly obtusely angulate or rounded. 83. ALACRIS. 



l)b. Fastigium semi-elliptical, the sides more strongly curved and tip 



broadly and bluntly rounded (Fig. 77, f.) ; tegmina usually 



transparent brown, the marginal field alone tinged with green; 



hind margin of pronotum subtruncate. 84. NEOMEXICANA. 



aa. Lateral carinae wholly wanting or (intertexta) feebly indicated (Fig. 



77, (?.); head of female distinctly shorter than pronotum (Fig. 78, 



B.); subgenital plate of male rather short, conical, blunt at tip 



(Fig. 77, &.) 



c. Fastigium of vertex more prominent and angulate, its greates^ 

 width not more than its length in front of eye (Fig. 77, g.); 

 frontal costa distinctly narrowed at point of union with vertex, 

 its sulcus deep throughout; lateral carinae evident but faint. 



85. IXTERTEXTA. 



cc. Fastigium of vertex bluntly rounded, its greatest width more 

 than its length before front margin of eye (Fig. 77, 7i.); fron- 

 tal costa but slightly narrowed at point of union with vertex, 

 its sulcus shallow and below the ocellus evanescent; lateral 

 carinae wanting. 



(I. Male without a pale subcostal stripe on basal half of tegmina; 

 vertex with a more or less distinct median carina; general 

 color greenish. 86. BIVITTATA. 



el (I. Male with a subcostal pale stripe on basal half of tegmina; 

 vertex without a median carina; general color buffy. 



87. IIACCLUNGI. 



83. MERMIRIA ALACRIS Scuclder, 1877b, 30. Lively Locust. 



Elongate, rather robust; color largely green; head green, with a me- 

 dian reddish-brown stripe above, and a broader postocular one, each side, 

 all three often extending back to hind margin of pronotum; face with a 

 narrow similar stripe each side; tegmina green, usually with a narrow 

 reddish stripe reaching from base three-fourths or more to apex along the 

 median area; antennae and tibia? reddish-brown; hind femora dull green 

 tinged with fuscous brown. Pronotum and head subequal in length, the 

 former with lateral carinae distinct on prozona, which is twice as long as 

 metazona. Tegmina and wings extending slightly beyond tip of abdomen. 

 Subgenital plate of male very strongly produced. Length of body, $ , 

 28 40, 9, 41 55; of antennae, $ , 15, $,16; of pronotum, $ , 5 6.4, 9, 

 79; of tegmina, $, 2128, 9, 3038; of hind femora, $, 1823, 9, 

 28 29 mm. 



Dunedin, Fla., Oct. 29, one female (W. 8. B.) ; Mobile, Ala., 

 Aug. 25, Sept. 19 (Loding) ; Macon, Ga., Oct. 12 (Fo.r). Record- 



