TOMONOTTIS.— DEEOTMEMA. 171 



Hob. Noeth Amekica 1 , Fort Grant and Phoenix, Arizona (coll. L. Bruner), 

 Southern California (A. Koebele), Santa Rita Mts., Arizona (Schwarz), Huachuca Mts., 

 Arizona (coll. US. Nat. Mus.).— Mexico, Uruapan (coll. Philad. Acad. : 1 $ 2 ). 



The specimen referred to as coming from Uruapan is not quite typical and bears 

 some resemblance in structure, if not in colour, to the preceding species. It is the 

 insect referred to by Rehn as Arphia behrensi (loc. cit.). 



3. Tomonotus orizabas, Sauss. 



(Edipoda mexicana, Sauss. Rev. et Mag. Zool. xiii. p. 397 (1861) l ; Thom. Syn. Acrid. N. Amer. 



p. 214 (1873) 2 . 

 Tomonotus orizabce, Sauss. Prodr. OEdip. p. 98 (1884) 3 ; Scudd. Cat. N. Am. Orthopt. p. 38 



(1900) 4 ; Rehn, Trans. Am. Ent. Soc. xxix. p. 11 (1902) 5 ; Proc. Acad. Nat. Sci. Philad. 



1904, p. 526 6 . 



Hab. Noeth Ameeica, Texas 4 . — Mexico, Jalisco and Michoacan 5 6 , Salina Cruz, 

 Oaxaca (C. C. Beam), Cuernavaca, Morelos (0. W. Barrett), Tabasco % (coll. L. Bruner) ; 

 Guatemala; Costa Rica (C. F. Underwood). 



This seems to be the most widely distributed species of Tomonotus, but not the 

 commonest one, since but few specimens have fallen into the hands of the present 

 writer. It also appears to be less variable in colour than either of the preceding 

 forms. 



4. TomonotUS azteCUS, Sauss. (Tab. II. figg. 7, 8, ? .) 



(Edipoda azteca, Sauss. Rev. et Mag. Zool. xiii. p. 397 (1861) 1 ; Thom. Syn. Acrid. N. Amer. 



p. 215 (1873) 2 . 

 Tomonotus aztecus, Sauss. Prodr. CEdip. p. 99 (1884) 3 ; Scudd. Cat. Orthopt. N. Amer. p. 38 



(1900) 4 ; Rehn, Trans. Amer. Ent. Soc. xxvii. p. 96 (1900) 6 ; Proc. Acad. Nat. Sci. Philad. 



1904, p. 526 6 . 

 Hab. Noeth Ameeica, Texas 4 . — Mexico 13 , Villa Lerdo in Durango and Aguas 

 Calientes (L. Bruner), Cuernavaca in Morelos and Tamaulipas 5 6 . 



This species forms a transition to the genus Lactista, as stated by Saussure. If the 

 Cuernavaca specimen referred to by Rehn is not a misidentification, T. aztecus enjoys 

 a very wide range. 



DEROTMEMA, Scudder. 

 (Edipoda of authors (in part.). 



Derotmema, Scudder, Ann. Rep. Chief Eng. U.S. Geogr. Surv. W. 100th Merid. 1876, 

 Append. JJ, p. 513. 

 Derotmema occurs generally over the South-western United States in the arid regions 

 on alkali-flats and other partially bare grounds along rivers and creeks. At least five 

 recognized species will be noticed here. 



Zz2 



