XYEONOTUS.— SPHENAEIUM. 203 



species. Its general colour and appearance would indicate a life among dead leaves. 

 The insect is probably a denizen of the jungles of the warmer parts of the country. 



1. XyrollOtus azteCUS, Sauss. (Tab. IV, figg. 23, 23 a, c? .) 



Xyronotus aztecus, Sauss. in litt. 1 ; Boliv. Monogr. Pirgomorfinos, p. 96, t. 2. figg. 12, 12 a-c 

 (1884) 2 ; Karsch, Ent. Nachr. xiv. p. 343 (1888) 3 . 

 Hab. Mexico 1_3 , Orizaba (coll. L. Bruner). 



A single specimen, a male, is at hand. It is in the present writer's collection, and 

 bears the label " Mexico, Apr." 



SPHENARIUM, Charpentier. 

 Sphenarium, Charpentier, Orthopt. descript. et depict, t. 31 (1841-1845). 



The genus Sphenarium is composed of about a dozen closely related species, or 

 forms, of wingless locusts that are distributed over portions of Middle and Southern 

 Mexico. Some of them enjoy a rather wide range, while others are much more 

 restricted in their distribution. The following synoptical table will show the relation- 

 ships of the forms which are here recognized : — 



Table for separating the Species of Sphenarium. 



A. Tegmina with their edges parallel or nearly so, very little or not 

 at all broadening toward their apices. Pronotum cylindrical, its 

 median carina usually but poorly defined in the males, a little more 

 prominent in the females. 

 b. Cheeks hack of the eyes smooth. Knees of hind femora fusco- 

 castaneous. 

 c. Size large ($, length 33 mm.). Body smooth, more or less 



glabrous; pronotum punctate 1. histrio, Gerst. 



cc. Size smaller ($, length 25-28 mm.). Body dull, rugose; 

 pronotum somewhat transversely wrinkled. 

 d. Lateral edges of the pronotum of female pale. The male 



without a conspicuous pale dorsal stripe 2. carinatum, Boliv. 



dd. Lateral edges of the pronotum in the female concolorous. 

 The males provided with a very conspicuous pale dorsal 

 stripe which reaches from the front edge of the pronotum 



to the tip of the abdomen 3. bolivari, sp. n. 



bb. Cheeks back of the eyes tuberculate. Knees of the hind femora 



usually concolorous. 



c. More robust. General colour green. Lower lateral edges of 



female pronotum and tegmina concolorous. Male with 



reddish mesonotum, lateral pronotal and abdominal bands, 



and tegmina .4. mezicanum, Sauss. 



2Dd 2 



