TEACHTEHACHIS. 177 



5. Trachyrhachis texana, Sauss. 



Psinidia (Trachyrhachis) fuscifrons, var. texana, Sauss. Prodr. OEdip. pp. 161, 163 (1884) \ 



Hob. Noeth America, Texas *, San Antonio (M. Newell). — Mexico. Mitla (C. C. Beam, 

 U.S. Nat. Mus.). 



Although the insect here treated is very closely related to T. fuscifrons, St&l, its 

 much smaller size and more strongly rugose pronotum have decided me in treating it 

 as a distinct species. Found at Mitla in July. 



6. Trachyrhachis fuscifrons, Stal. 



Psinidia fuscifrons, Stal, Recens. Orthopt. i. p. 134 (1873) \ 

 Psinidia (Trachyrhachis) fuscifrons, Sauss. Prodr. CEdip. p. 163 (1884) 2 . 

 Trachyrhachis fuscifrons, Sauss. Addit. Prodr. CEdip. p. 58 (1888) 3 . 

 Mestobregma fuscifrons, Scudd. Proc. Dav. Acad. Nat. Sci. ix. p. 39 (1900) \ 



Hab. Noeth America, Texas, &c. 1-4 . 



"While no specimens or records are at hand that would indicate the occurrence of 

 this species in Mexican territory, the fact of its being very common in the country 

 bordering the Rio Grande is sufficient evidence that it may be taken across that river 

 in both Coahuila and Nuevo Leon, and perhaps also in Tamaulipas. 



7. Trachyrhachis capito, Stal. 



Psinidia capito, Stal, Becens. Orthopt. i. p. 133 (1873) l . 

 Psinidia (Trachyrhachis) capito, Sauss. Prodr. CEdip. p. 163 (1884) 2 . 

 Trachyrhachis capito, Sauss. Addit. Prodr. CEdip. p. 58 (1888) 3 . 

 Mestobregma capito, Scudd. Proc. Dav. Acad. Nat. Sci. ix. p. 39 (1900) \ 

 Hab. North America, Texas 1_4 . 



Like the preceding, the insect known as T. capito, on account of its uncommonly 

 large head, is very numerous along the American shore of the Eio Grande. It is 

 presumed that it also abounds just across this river in Mexican territory. 



[8. Trachyrhachis rubripennis, sp. n. 



This species is closely related to the locust described by Thomas under the name (Edipoda plattei. It seems 

 to differ from it, however, in being smaller, in the more equal size of the sexes, in the narrower wing- 

 band, and in the shorter and more obtuse hind angle of the disc of the pronotum. The dark and light 

 markings of T. rubripennis are also more in contrast than they are in T. plattei. 



Length of body, tf 17, ? 23 ; of pronotum, tf 3-6, $ 4*75 ; of tegmina, J 20, $ 25 ; of hind femora, tf 10*5, 

 $ 12-5 millim. 



Hab. Noeth Ameeica, Oracle, Arizona (U. A. Schwarz, U.S. Nat. Mus. : 1 s , 

 12). 



The widely separated localities in which T. plattei and T. rubripennis occur, without 

 anything similar being known from intermediate points, has decided me in describing 



biol. centr.-amee., Orthopt, Vol. II., January 1906. 2 Aa 



