184 ORTHOPTERA. 



1. Hadrotettix trifasciatus, Say. 



Gryllus trifasciatus, Say, Amer. Ent. iii. t. 34 (1828) \ 



(Edipoda trifasciata, Walk. Cat. Dermapt. Salt. Brit. Mus. iv. p. 729 (1870) 2 ; Thomas, Acrid. N. 



Am. p. 127 (1873) s . 

 Hadrotettix trifasciatus, Scudd. Ann. Rep. Chief Eng. 1876, p. 511 (1876) 4 ; Psyche, ix. p. 67 



(1900) 5 . 

 Arphia trifasciata, Caulf. Rep. Ent. Soc. Ont. xviii. p. 70 (1888) 6 . 

 (Edipoda prumosa, Thomas, Proc. Acad. Nat. Sci. Philad. 1870, p. 80 (1870) . 

 (Edipoda hoffmanni, Thomas, Rep. U.S. Geol. Surv. v. p. 127 (1873) 8 . 



Hab. North America, Rocky Mountain region, from the Saskatchewan to South- 

 western Texas 1-8 . — Mexico, States of Chihuahua and Coahuila (L. Bruner). 



2. Hadrotettix nebulosus, Scudd. 



Hadrotettix nebulosus, Scudd. Psyche, ix. p. 69 (1900) \ 

 Hah. Mexico, Sinaloa x (coll. S. H. Scudder). 



TREPIDULUS, McNeill. 



Mestobregma (in part.), Scudder, Psyche, ix. p. 91 (1900). 

 Trepidulus, McNeill, Proc. U.S. Nat. Mus. xxiii. p. 394 (Jan. 1901). 

 Araopteryx, Caudell, Canad. Ent. xxxiii. p. 103 (April 1901). 



This is still another characteristic genus of the arid region of Northern Mexico and 

 the south-western portions of the United States. Three species are known, and all 

 of them undoubtedly belong to the Mexican fauna. They may be recognized by 

 the annexed key : — 



Table for separating the Species of Trepidulus. 



A. Larger and more robust. Disc of wings rose-colour or miniaceous, 

 with or without a fuliginous wing-hand. Posterior lateral angle 



of pronotum provided with a tooth 1. rosaceus, Scudd. 



AA. Smaller and more slender. Disc of wings vitreous or hyaline, 



without trace of a fuliginous wing-band. Posterior lateral angle 



of pronotum without a tooth. 



b. Pronotum with the lower posterior angle slightly acute in both 



sexes. Wings transparent, with the basal fifth washed with 



citrous 2. gracilipes, Caudell. 



bb. Pronotum with the lower posterior angle well-rounded in both 

 sexes. Wings wholly pellucid, with some infuscation of the 

 apical veins [3. hyalinus, Scudd.] 



