EHABDOTETTIX. — CYCLOCEKCUS. 307 



This insect undoubtedly reaches southward and westward into Mexican territory, 

 since the two other representatives of the genus are confined to that country. 



2. Ehabdotettix palmeri, Scudd. 



Rhabdotettix palmeri, Scudd. Proc. U.S. Nat. Mus. xx. p. 31, t. 3. fig. 3 (1897) \ 

 Hab. Mexico, Montelovez, Coahuila *. 



3. Rhabdotettix pilosus, Stal. 



Pezotettix pilosus, Stal, Bihang till Svensk. Vet.-A.kad. Handl. v. no. 9, pp. 10, 11 (1878) \ 

 Paraidemona pilosa, Brunner, Rev. Syst. Orthopt. p. 145 (1893) 2 . 

 Rhabdotettix pilosus, Scudd. Proc. U.S. Nat. Mus. xx. p. 35 (1897) 3 . 



Hab. Mexico 1-3 . 



This insect is unknown to the present writer. 



CYCLOCEKCUS, Scudder. 



Cydocercus, Scudd. Proc. Amer. Acad. Art. Sci. xxxii, no. 9, p. 197 (1897) ; Proc. U.S. Nat. Mus. 

 xx. pp. 10, 36 (1897). 



Cydocercus is still another genus of short-winged medium-sized locusts peculiar to 

 Northern Mexico and Southern Texas. Three species were included in it by Scudder, 

 and a fourth is now added, the last-named coming closest to 0. accola. The previously 

 known forms were tabulated on p. 37 of Scudder's Revision of the " Melanopli." 



1. Cydocercus bistrigatus, Scudd. 



Cydocercus bistrigata, Scudd. Proc. U.S. Nat. Mus. xx. p. 37, t. 3. fig. 4 (1897) \ 



Hab. Mexico, Venis Mecas and Alvarez Mts. in San Luis Potosi and Sierra Nola in 

 Tamaulipas l . 



2. Cydocercus accola, Scudd. 



Cydocercus accola, Scudd. Proc. U.S. Nat. Mus. xx. p. 38, t. 3. fig. 5 (1897) \ 



Hab. North America, Corpus Christi Bay, Texas 1 . — Mexico, Tampico (coll. III. 

 State Lab. Wat. Hist.), Villa Lerdo in Durango (L. Bruner). 



3. Cydocercus gracilis, sp. n. 



A small, slender insect in which, the distinguishing character is the peculiar modification of the posterior 

 edge of the last dorsal segment of the c? -abdomen. Instead of being narrow and straight, or nearly so, 

 it is rather wide and projects upon the supra-anal plate in a broad triangular lobe on each side of the 

 middle, these lobes being nearly half as wide as the basal portion of the plate and almost one-half as 

 long as broad. 



Head about as broad as the front edge of the pronotum ; eyes somewhat prominent, fully twice as long a3 

 that portion of the cheeks below them, the posterior margin more rounded than the anterior, separated 



2 Rr2 



