Odonata from Argentina. 29r) 



restricted to the subcostal, median, and cubito-anal s[)accs, 

 while behind them lies only a narrow ditfusely-pigmented 

 area, barely exceeding the menibranule in length. 



The case of the female from Isla "Los Cisnes " is similar 

 to tliat of the males from the same locality. The basal 

 saflfroa suffusion in the hind wing is restricted in its extent 

 in much the same manner as the corresponding blackish- 

 brown spot in the wings of the n)ales. In the Buenos Aires 

 female mentioned above the satfron suffusion extends 4 or 5 

 cells beyond the apex of the membranule, while in the male 

 with which it is associated the dark spot ceases at the fourth 

 cell. 



As regards the material i>f E. connala identified i)y Calvert 

 for the Godman-Salvin Collection, our males are less ex- 

 tensively marked in the hind wing than the males which he 

 distinguishes by the letter " e," and to which the name 

 fiisca more strictly applies (Biol. Ceutr.-Amer., Neuropt. 

 p. 261, 1906). There is a much closer agreement, however, 

 with males from Guatemala (Gualan) and Mexico (Misantla) 

 bearing the letter "c," although in neither of those speci- 

 mens is the spot so dark in colour as in the most adult 

 example from Isla " Los Cisnes." 



Another female from Isla " Los Cisnes " may also belong 

 to E. coniiata fusca. It has, however, more of the appear- 

 ance of E. connala connata, but no males of that form 

 are forthcoming from the same island to support that 

 identirication. 



Erythrodiplax nigricans, Ramb. 



3 J , 6 $ , Isla Ella, Rio Parana, x. 1919 ; 7 c^ , 4 ? , Isla 

 "Los Cisnes," Rio Parana, vi.-xi. 1920. 



These specimens belong to the typical form of the species, 

 in which the wings are frequently marked with a small 

 brown cloud beneath the pterostigma. It may be worthy of 

 note that, while this cloud is present in the case of more 

 than half the specimens from Isla '* Los Cisnes" (4 c?, 2 ? ), 

 it does not appear to be exhibited at all by any of those from 

 Isla Ella. 



