2S2 OETHOPTERA. 



species, but no doubt a little careful collecting in various parts of Mexico and Central 

 America will add considerably to the number. These large, highly-coloured locusts 

 occur in suitable localities from Southern Costa Eica to Southern Texas, New Mexico, 

 and Arizona. No single species seems to be very widely distributed, but each locality 

 has its characteristic form. The following table, which is based in part on that 

 of Bolivar, will give the reader a general idea of the various forms and their 

 relationships : — 



Table for separating the Species o/Tseniopoda. 



A 1 . Median carina of the pronotum comparatively low, especially on the 

 posterior lobe, where it is nearly straight and not strongly arcuate 

 as in the alternative category. 

 b 1 . General colour black, deep green, or fuscous, the head and pronotum 

 bordered with, and the carinse, yellowish or reddish. 

 c x . Tegmina and wings with a narrow apical pale border .... 1. burmeisteri, Bol. 

 c 2 . Tegmina and wings without the narrow apical pale border . . 2. picticornis, Walk. 

 b 2 . General colour brown or testaceous, with or without the ferruginous 

 or testaceous line on the head and pronotum. 

 c\ Form rather slender or only moderately robust, even in the 

 females. Colour largely testaceous. 

 d 1 . Median carina of the anterior lobe of the pronotum arcuate ; 

 antennae, except the two basal and several apical joints (which 

 are black), red, very narrowly annulate with black. Frontal 



carinas concolorous or pale 3. stall, Bruner. 



d 2 . Median carina of the anterior lobe of the pronotum straight ; 

 antenrise lemon-yellow, the two basal joints inclusive (the 

 apical ones are missing in both specimens at hand). Carinse 



of the pronotum shiny black 4. citricornis, sp. n. 



c s . Form, of female at least, very robust (the male is not known). 

 General colour te burnt-sienna." Median carina and posterior 

 margin of the pronotum ferruginous, the former bordered with 



black 5. tamaulipensis , Relm. 



A 2 . Median carina of the pronotum very high, quite strongly arcuate on 

 both lobes. 

 b x . Crest of pronotum and lateral carinas adorned with black lines. 

 The crest of the hind lobe usually higher than that of the front 

 lobe. 

 c\ The crest of the pronotum usually marked with a narrow pale 

 median line, 

 (f . Tegmina with the veins chiefly pale. Hind femora nearly or 

 quite as long as the abdomen in the female. 

 e\ Size very large ( ? 62 mm. or more in length) ; the sexes 

 conspicuously unequal. Tegmina of the females as long as, 



