Odonatafrom Argentina. 293 



by His (Dcutsdi. Eiit. Zeitsclir. 1908, pp. 523-527), these 

 arc, respectively, j^E. diffinis, Kanib., and JE. bonarieii.tis, 

 Kaiub. Two females from Fofocahuel (Cliubut), referred to 

 jE. diffinis, are ill-preserved, and call for no further com- 

 ment. As regards the other specimens of yE. diffinis, those 

 from Lake Epuyt'-n, the stem of the T-shaped marking on 

 the frons is somewhat variable, both in stoutness and form, 

 although its sides are never so nearly {)arallel as in honari- 

 ensis. In only one or two of the examples of diffinis can 

 even vestiges be traced of any pale antehumeral stripes, and 

 then they take the form of a pair of small comma-like spots 

 on the anterior portion of the meso-metathorax. In bonari- 

 ensis, on the contrary, the presence of such spots is the rule, 

 and not the exception. A character which appears to be 

 quite constant is the greater extent in diffinis than in 

 bonarieusis of the white area at the base of the membranule. 

 Another distinguishing character which appears to be 

 equally constant is the greater development in diffinis of 

 the longitudinal dorsal carina on the superior anal append- 

 ages of the male. 



jEschna diffinis^ Ramb. 



2 ? , Fofocahuel, Upper Chubut River, xii. 1919. 

 9 c?, 10 ?, Lago Epuyen, N.W. Chubut, xii. 1919- 

 i. 1920. 



^schna bonariensis, Ramb. 

 4 (? , 2 ? , Isla Ella, Rio Parana, x. 1919. 



Family Libellulidae. 



Subfamily Coridvliinm. 



As already stated, the known Odonatc-fauna of Argentina 

 is no longer without representatives of the Corduliinic. 

 Both the sj)ecies which are now added to that fauna were 

 described from Chile, and were supposed to be peculiar to 

 that country. 



Gomphomacromia paradoxa, Brauer. 

 1 ? , Lago Epuyen, X.W. Chubut, xii. 1919-i. 1920. 



