174 ORTHOPTEKA. 



Table for separating the Species o/Trachyrhacbis. 



A. Tegmina irregularly marked and blotched with fuscous. 



b. Disc of wings hyaline or vitreous, sometimes very pale dirty 

 yellow, without a fuliginous band, but in some cases with 

 the apex dusky. 

 c. Wings entirely vitreous, some of the veins alone dark. 



d. Species robust; tegmina and wings about as long as the 



abdomen. (Zacatecas.) 3. inconspicua, sp. n., ? . 



dd. Species more slender; tegmina and wings longer than the 

 abdomen. 

 e. General colour greenish-white marked with black . . . [pulchella, Bruner.] 

 ee. General colour cinereous and brown marked with 



fuscous [kiowa, Thorn.] 



cc. Wings with their apical portion clouded. 



d. Anterior field, and apical two-fifths in both sexes strongly 



fuliginous 2. compacta, sp. n. 



dd. Anterior field and apical two-fifths in male alone somewhat 



clouded. (Zacatecas.) 3. inconspicua, sp. n., <J 



bb. Disc of wings some shade of yellow or red, crossed by a more or 

 less well-defined fuliginous band. 

 c. Wings with the disc always yellow. 

 d. The disc of wings pale dirty yellow. 



e. Wing-band incomplete or interrupted near its middle. 

 Costa on apical half dark ; apex more or less conspersed 



with dusky. (Mexico, southerly.) 1. mexicana, Sauss. 



ee. Wing-band complete. 



/. Species robust ; the hind femora very broad, their upper 

 carina suddenly narrowing just beyond the middle ; 

 wing-band pale, the taenia nearly reaching the base . [aspera, Scudd.] 

 ff. Species more slender; the hind femora not unusually 

 broad and their superior carina not suddenly nar- 

 rowing ; the taenia reaching halfway to base. 

 g. Fuliginous band of wings broad, dark and scarcely 



narrowed anteriorly. (Mts. of Chihuahua.) ... 4. townsendi, sp. n. 

 gg. Fuliginous band of wings narrow. (San Francisco.) [occidentalis, sp. n.] 

 dd. The disc of wings lemon-yellow. 



e. Wing-band always complete, not interrupted anteriorly. 

 /. Pronotum rugose, the middle section of the median 

 carina short, elevated, and rounded. Hind femora 

 stout, the upper carina suddenly lowered one- third 



the length from the apex [thomasi, Caudell.] 



ff. Pronotum smooth, the middle section of the median 

 carina low. Hind femora moderately slender, the 

 upper carina not suddenly lowered [cinctipennis, Bruner.] 



