BRACHYSTOLA. 193 



Table for separating the Species of Brachystola. 



A. Posterior margin of the disc of the pronotum truncate or but gently 

 rounded. The tegmina more or less profusely mottled with black. 

 b. Tegmina rather sparsely mottled. Insect very large and robust. 



(Guaymas, Mexico.) 2. ponderosa, sp. n. 



bb. Tegmina more profusely mottled. Insects variable in size. 



c. Smaller; general colour green or greenish ; the disc of the pro- 

 notum regularly and coarsely granulate throughout. (Mexico 



northward, and New Mexico.) 4. virescens, Charp. 



cc. Larger ; general colour more tinged with testaceous and rufous ; 



the disc of the pronotum less regularly granulate, especially 



posteriorly. 



d. Tegmina rather sparsely and irregularly mottled; the rugosities 



of the pronotum large, profuse, sharp, and distinct, not running 



together so as to form irregular ridges. (Lower California and 



Mexico in the vicinity of Mazatlan.) .3. intermedia, sp. n. 



dd. Tegmina usually regularly and profusely mottled; the rugosities 

 of the pronotum blunter and often running together, so as to 

 form low tortuous ridges, much weaker on the hind lobe. 



(U.S. from Texas northward.) 1. magna, Girard. 



AA. Posterior margin of the disc of the pronotum decidedly rounded or 



even angulate. The tegmina without mottling, the background dark 



and the veins light. 



b. Pronotum with its posterior edge broadly and evenly rounded, not 



margined on the disc, which is nearly smooth on its posterior 



third 5. mexicana, sp. n. 



bb. Pronotum with its posterior edge angulate or subangulate, some- 

 times provided with a very marked margin on the disc behind. 

 c. Larger; the pronotum decidedly tectate and when viewed laterally 

 evenly arcuate, its posterior edge subangulate and provided with 

 a well-marked border, the hind lobe granulate above. (Durango 



or Sinaloa.) 6. behrensi, Scudd. 



cc. Smaller; the pronotum not decidedly tectate, and when viewed 

 laterally nearly straight, its posterior edge angulate and without 

 a border, the hind lobe smooth. (Tepic.) 7. eiseni, sp. n. 



l. Brachystola magna, Girard. 



Brachypeplus magnus, Gir. in Marcy's Expl. Red River, p. 231, t. 15. figg. 1-4 (1853) 1 ; Thomas, 

 Proc. Acad. Nat. Sci. Philad. 1870, p. 79 2 ; Ann. Rep. U.S. Geol. Surv. Terr. ii. p. 271 

 (1871) 3 ; Scudd. Rep. U.S. Geol. Surv. Nebr. p. 250 (1872) 4 ; Glover, Illustr. N. Am. Ent., 

 Orthopt. t. 7. fig. 11 (1872) 5 . 



Brachystola magna, Scudd. Bull. U.S. Geol. Surv. Terr. ii. p. 267 (1876)'; Sauss. Prodr. (Edip. 

 pp. 241, 242 (1884) 7 ; Addit. Prodr. ffidip. pp. 163, 164 (1888) 8 . 

 biol. cente.-amer., Orthopt., Vol. II., August 1906. 2 Cc 



