21)2 Mr. H. Campion on 



thorax results in the disappearance of postocular spots and 

 tlioracic stripes. 



Oxyagrion terminale, Selys. 



3 c?, 3 ? , Isla Ella, Rio Parana, x. 1919. 



1 (^ , Isla " Los Cisnes," Rio Parana, vi.-xi. 1920. 



Known from Brazil, Argentina, and Paraguay, while a 

 local form has been described from Bolivia (Ris, Arch. 

 Naturg. Ixxxii. A. 9, p. 127, 1918). 



Ceratura capreola, Hagen. 



3 J , 2 $ (citron), Tsla "Los Cisnes," Rio Parana, vi.-xi. 

 1920. 



This extremely small species has been recorded from the 

 West Indies, Mexico, and Central and South America, but 

 " the citron female is not yet known outside South 

 America" (Calverf, Biol. Centr.-Amer., Neuropt. p. 132, 

 1903). 



Ischnura fluviatilis, Selys. 



7^,9 ? , Isla Ella, Rio Parana. 



The anal appendages of the males seemed to show some 

 degree of variation from the figures published by Dr. Ris 

 [Mem. Soc. Ent. Belg. xxii. p. 71, fig. 10 (1913); Arch. 

 Naturgesch. Ixxxii. A. 9, p. 132, fig. 74 (1918)], and accord- 

 ingly specimens were sent to him for examination. In his 

 opinion, however, nothing beyond individual variation is 

 indicated in the material which was submitted. 



The females all belong to the orange form. 



The species has been recorded from Brazil, Paraguay, and 

 Chile, as well as from several localities in Argentina. 



Family JEschnidae. 



Subfamily ^sceninx. 



Genus iEscHNA. 



Two closely-related species of jEschna are represented in 

 the collection, a larger one from the Territory of Chubut, 

 and another, noticeably smaller in size, from the Province 

 of Buenos Aires. According to the table and figures given 



