EEITETTIX. 53 



tip of the abdomen. Supplemental carinse of the pronotum nearly 



or quite as prominent as the median [1. virgatus, Scudd.] 



b 1 . Tegmina and wings abbreviated, at least in the female (the male 

 is not known). Supplemental carinse of the pronotum less con- 

 spicuous than the median 2. brachypterus , sp. n. 



A 2 . Lateral carinse of the pronotum moderately arcuate before the middle. 



ft 1 . Antennae clavate [3. navicula, Scudd.] 



b 2 . Antennae acuminate, not clavate [4. variabilis, Brxmer.] 



[1. Eritettix virgatus, Scudd. 



Gomphocerus virgatus, Scudd. Proc. Bost. Soc. Nat. Hist. xvii. pp. 511,512 (1875) l ; Bruner, Rep. 



U.S. Ent. Comm. iii. p. 56 (1883) 2 . 

 Eritettix virgatus, Bruner, Proc. U.S. Nat. Mus. xii. p. 56 (1890) 3 ; McNeill, Proc. Dav. Acad. 



Nat. Sci. vi. pp. 218, 219, t. 2. figg. 9, 9 a, b (1897) \ 

 Eritettix vernalis, Bruner, Publ. Nebr. Acad. Sci. iii. p. 22 (1893) 5 . 



Hab. North America, Texas 1-5 . 



While not included in any of the collections coming from Mexico and examined by 

 me, E. virgatus is almost certain to occur across the border.] 



2. Eritettix brachypterus, sp. n. 



A rather smaller species than the average, with the wings of the female (at least) abbreviated, only one-half 

 the length of the abdomen. Antenna? not clavate ; the lateral carinas of the pronotum but gently arcuate, 

 the supplemental carina? much less conspicuous than in E. virgatus, which it most closely approaches. 



Head not prominent, about as wide as the front edge of the pronotum ; vertex scarcely as wide between the 

 eyes as their smaller diameter, the fastigium short and provided with gently raised borders, the median 

 carina prominent, as well as the supplemental carina? on the occiput ; lateral foveola? subtriangular, not 

 very prominent ; frontal costa prominent, especially between the base of the antennae, a little constricted 

 above and with the sides gently approaching at the ocellus, otherwise broad, evenly expanding below, not 

 sulcate. Antenna? with the joints a little flattened, but not at all clavate, somewhat shorter than the 

 combined length of the head and pronotum. The latter somewhat wider behind than in front ; the lateral 

 carina? gently arcuate a little in advance of the middle ; supplemental carinse much less prominent than 

 either the median or the lateral, but still quite apparent; oblique carina? of the sides well developed; 

 front edge straight, the hind edge above very broadly angulate. Tegmina and wings about one-half as 

 long as the abdomen, the former acuminate, and with the scapular area near the base considerably 

 dilated. Hind femora normal, about reaching the tip of the abdomen. Tibia? with 11 spines in the outer 

 row, and with the inner apical claws very unequal in length — a characteristic, however, of all members 

 of the genus. 



General colour of single specimen examined green, varied with white, testaceous, ferruginous, and black. 

 Lateral and oblique carina? of the pronotum white, bordered with black or piceous. Occiput and the disc 

 of the pronotum between the supplemental carina? ferruginous, the remainder of the disc black, the sides 

 below the oblique carinse piceous. Tegmina with a narrow, subcostal, green line, the disc infuscated, the 

 costal and dorsal fields cinereous. Hind femora greenish-testaceous, the upper edge of their outer face a 

 little darkened. Hind tibia? testaceous, somewhat darker apically. Antenna? ferruginous at the base, 

 a trifle paler and tinged with green apically. Probably variable in colour. 



Length of body, $ , 20 ; of pronotum 3-15, of tegmina 6*75, of hind femora 11 millim. 



Hab. Mexico, Ciudad in Durango 8100 feet (Forrer). 

 A single female. 



