242 ENTOMOLOGICAL NEWS. [June, '17 



new genus is separated, by Foerster, from Leptagrion by the 

 presence of a vulvar spine in the female, by the unequal teeth 

 of the tarsal claws, and by the form of the superior append- 

 ages of the male. But it seems impossible, after comparing 

 Foerster's description of the male appendages of crocewn 

 with figures 15 and 16 of this paper, that his determination of 

 croceum is correct. In fact I am convinced he had a Lepto- 

 basis, probably vacillans before him. As to his new species, 

 H. argcnteoUncatum, I have no doubt this is really Leptagrion 

 d'orsalc, a species in which the vulvar spine is wanting in the 

 female. In Lcptobasis the vulvar spine is normally present. 

 It is true Calvert (Ann. Cam. Mus., VI, p. 201) describes a 

 new Leptobasis, mammilaris, in which the single female lacks 

 this spine. But Calvert's specimen was associated with the 

 males only on supposition, and a female in my collection, which 

 I think is a true Lcptobasis mammilaris, is different and has 

 the spine well developed. 



The type of Leptagrion is macrurum Burmeister. Among 

 the species associated under Leptagrion by de Selys it is pro- 

 posed to recognize and describe a second genus Aeolagrion, 

 type Agrion dorsalc Burmeister. These two genera may be 

 separated by the following key : 



a 1 . Descending crossvein from the subnodus not continued directly to 

 the wing margin, the marginal cell, against which it ends, high and 

 pentagonal, the adjoining marginal cells high and the hind margin of 

 the wing full and rounded, nearly paralleling the front margin ; M 2 in 

 front wing arising at the sixth postnodal or more clistad, in the hind 

 wing at the fifth or more distad ; Rs and M 3 widely separated at the 

 proximal crossvein between them; tooth on tarsal claw large, almost 

 equalling the claw; male inferior appendages rudimentary. 



Leptagrion. 



a 2 . Descending crossvein from the subnodus continuous to the wing 

 margin, the marginal cells on either side of it low and quadrangular, 

 the wing spatulate, the hind margin not paralleling the front mar- 

 gin : Rj and Ma narrowly separated at the proximal crossvein be- 

 tween them; tooth on tarsal claw well developed but distinctly 

 shorter than claw; male inferior appendages well developed. 



Aeolagrion. n. gen. 

 b 1 . M 2 in front wing arising at the seventh postnodal, in the hind 



