112 PROCEEDINGS OF THE ACADEMY OF [March, 



In the male sex the form of the cerei, tapering and very narrowly 

 rounded in desiliens and subequal and subtruncate in wqualis, 

 is a fairly satisfactory clue to the species. The cerci in the three 

 males available for study have the apical angular emargination 

 described by Scudder extrememly slight and hardly perceptible. 



Six individuals, three of each sex, have been examined, those 

 in addition to . the Caracas specimen being from Demerara and 

 Bartica, British Guiana. 



Schistocerca peregrina (Olivier). 



1804. Acridimn peregrinum Olivier, Voyage I'Emp. Othoman, II, p. 425. 

 [Egypt; Arabia; Mesopotamia; Persia.] 



Venezuela. [U. S. N. M.] One 9 . 



This specimen has been compared with undoubted specimens 

 of S. peregrina received from the late Dr. Saussure. 



Schistocerca paranensis Burmeister. 



1861. Acridium paranense Burmeister, Reise durch La Plata-Staaten, 

 I, p. 491. [La Plata country; Parand; Entre Rios.] 



Medellin, Antioquia, Colombia. 1879. (Thos. Herran.) [U. S. 

 N.M.] One cf, two 9 . 



Caracas, Venezuela. (Dr. A. Ernst.) [U. S. N. M.] Three cf , 

 seven 9 . 



Berbice, British Guiana. September 6, 1886. (J. J. Quelch.) 

 [U. S. N. M.] Two d^, three 9 . 



From the specimens recorded above it is evident that this migra- 

 tory and destructive locust is at times present in northern South 

 America, and from data with the Caracas series it seems that it 

 appears in considerable assemblages. Dr. Ernst's remarks are to the 

 effect that the species "invaded" the region "from September, 

 1882, to January, 1883," and he also states the "flight was to the 

 northeast and at a height of about twenty feet from the ground." 



There is in this series a very considerable amount of variation 

 in size in individuals of both sexes. A number of specimens of the 

 female sex are no larger than several of the Caracas males. 



AIDEMONA Brunner. 

 Aidemona azteca (Saussure). 



Western Colombia. [Hebard Collection.] One 9 . 



This specimen is not separable from females of the States of San 

 Luis Potosi and Vera Cruz, Mexico. The range of the species is 

 here extended some distance south of the previously known southern 

 limit of the species. 



