240 OKTHOPTEKA. 



TROPIDACRIS, Scudder. 



Tropidacris, Scudder, Proc. Bost. Soc. Nat. Hist. xii. p. 346 (1869) ; Stal, Recens. Orthopt. i. 

 p. 31 (1873) ; Syst. Acrid, i. p. 18 (1878) ; Pict. et Sauss. Cat. Acridiens, i. p. 28 (1887). 



The present genus contains our largest locusts and is represented by about half a 

 dozen species which are distributed over both North and South America between the 

 30th degree of north and south latitude. All of them probably reach the territory 

 under investigation. They have been carefully studied by Professor Pictet and 

 Dr. Saussure, to whose work the reader is referred for a synopsis of the species, 

 together with their synonomy. 



1. Tropidacris dux, Drury. (Tab. III. figg. 8, 8 a.) 

 Gryllus (Locusta) dux, Drury, Illustr. Nat. Hist. ii. t. 44 (1773) \ 

 Acridium dux, Oliv. Encycl. Meth. vii. p. 215, t. 126. fig. 1 (1791) 2 . 



Locusta (Rutioderes) dux, Westw. in Drury's Illustr. Exot. Ent. ii. p. 92, t. 44 (1837) 3 . 



Locusta dux, Duncan, Introd. Ent. p. 257, t. 15. fig. 2 (1840) 4 . 



Tropidacris dux, Scudd. Proc. Bost. Soc. Nat. Hist. xii. (1869) 5 ; Pict. et Sauss. Cat. Acrid, i. 



pp. 29, 30 (1887) 6 . 

 Acridium latreillei, Perty, Del. Anim. Artie, p. 123, t. 24. fig. 4 (1834) 7 . 

 Gryllus cristata, Thunb. (nee Linn.), Mem. Acad. St. Petersb. v. p. 224 (1815) s . 



Hab. Noeth America, Texas (Scudder). — Mexico; Central America, Bay of 

 Honduras l ; Costa Eica ( Underwood) ; Panama, Chiriqui (Bibbe). — South America 

 to Brazil 7 . 



One of these large locusts was seen in the neighbourhood of Omaha, Nebraska, 

 during the summer of 1872 or 1873, but it was too wild to be captured, although 

 several hours were spent in an effort to take it. 



2. Tropidacris cardinalis, Pictet et Saussure. (Tab. III. fig. 10.) 

 Tropidacris cardinalis, Pict. et Sauss. Cat. Acrid, i. pp. 30, 31 (1887) \ 



Hab. Mexico, Medellin, Vera Cruz (Bev. T. Heyde), Temax, N. Yucatan (Gaumer); 

 Guatemala 1 . 



This species is markedly smaller than the preceding, and seems to be distributed 

 about the western and south-western coast of the Gulf of Mexico. 



3. Tropidacris imperialis, Pictet et Saussure. (Tab. III. fig. 9.) 

 Tropidacris imperialis, Pict. et Sauss. Cat. Acrid, i. p. 31 (1887) \ 



Hab. Guatemala 1 , San Geronimo (Champion: $ ). 



As suggested by Pictet and Saussure, this insect is probably a variety of the 

 preceding, but seems to be sufficiently different to have a name of its own. 



