472 PROCEEDINGS OP THE AMERICAN ACADEMY. 



38. Schistocerca peregrina. 



Acridium peregrimim Oliv., Voy. Emp. Ott., II. 424 (1807). 



Acridium (Schistocerca) pereyrinum Stfil, Rec. Ortli., I. 65 (1873). 



Acridium (Schistocerca) peregrimim (pars) Berg., Aual. Soc. Cient. Argent., IX. 275 



(1880). 

 Schistocerca peregrina Brunn., Prodr. Eur. Ortli., 215 (1882). 



Gryllus migratoriits (pars) Thunb., Mem. Acad. St. Pe'tersb., V. 243 (1315) t. Stal. 

 Gryllus rufescens Thunb., Loc. cit., V. 245 (1815) t. Stal. 

 Acridium flaviventre Burm., Handb. Ent., II. 631 (1838). 



This is the migratory species which occurs on both sides of the Atlantic. 

 I have seen specimens from Brazil, Janson, and Panama, Hassler Exp. 

 (Mas. Comp. Zool.), in this comitrj ; and in the Old World from Spain, 

 Bolivar, Cairo, Egypt, Upper Egypt, and the Cape of Good Hope, the 

 last from Schaum's collection, XnheWeA Jlaviventre. Its distribution in the 

 Old World is given by Brunner as northern Africa, from Senegal to the 

 Red Sea, but not farther south, Syria, the Balearic Islands, and Portugal. 

 The published references to its occurrence in America have been obscured 

 by other species being confounded with it, so that no further details can 

 be given than are found above. Stal, however, states that the Stockholm 

 museum has specimens from Argentina, Montevideo, and Bahia in 

 America, and from j\Iadeira, Teneriffe, Algeria, Egypt, Nubia, and the 

 East Indies. 



As this is the only species of Schistocerca known in the Old World, 

 and as it occurs in both hemispheres, there can be little doubt that it 

 originated in America, — the home of the genus. Notwithstanding its 

 known powers of extended flight one would hesitate to affirm that it crossed 

 the Atlantic Ocean on the wing, were it not that it has actually been taken 

 on vessels in midocean,* viz. in Lat. 25° 28' N., Long. 41° 33' W., which 

 is about as near one continent as the other, but slightly nearer Africa. 

 "The clouds and ship's sails were full of them for two days" early in 

 November. 



39. Schistocerca paranensis. 



Acridium paranense Burm., Reise La Plata, I. 491 (1861). 



Schistocerca paranensis Brun., Inf. Com. Inv. Lang., I. 1, pi., figs 1-3, 6 (1898). 

 Acridium (Schistocerca) peregrimim (pars) Berg, Anal. Soc. Cient. Argent., IX. 

 275 (1880). 



This is the destructive locust of Argentina, which has sometimes been 

 confounded with the preceding. The only specimens I have seen are 



* See Psyche, II. 24. 



