318 ENTOMOLOGICAL NEWS. [J u ty> 'l6 



it. Venational differences may be noted in the tabulation 

 which closes this paper, especially the more apical position of 

 the arculus and of vein A and the larger number of post- 

 nodals in kennedii. 



Like ascendens (see postea under that species) the female 

 of kennedii runs out to C, under B, under A. As might be ex- 

 pected the mesepisternal fossae of kennedii, corresponding to 

 the shorter (lower) appendages and the less elevated tenth 

 segment of the male, are placed lower on the sclerites than in 

 gracile. It is possible the form of the mesostigmal lamina 

 may be of value in separating the two species. As in the 

 male, the female of kennedii has much more black than the 

 female of gracile; for example gracile has the nasus largely 

 pale and the dorsum of the head more extensively pale- 

 marked, and the dark markings on both thorax and legs are 

 reduced in extent as compared with kennedii; in gracile in 

 some cases abdominal segment 8 in side view is largely pale, 

 the black occupying the upper third of the segment for about 

 two-thirds its length from the base ; in those cases where the 

 black is more extensive and reaches the apex of the segment 

 the inferior yellowish border is fully twice as wide as it is 

 ever found in kennedii; segment 9 is similarly conspicuously 

 paler in gracile and even in the darkest examples the superior 

 apical blue area -posteriorly blends insensibly below into the 

 pale inferior margin which is much wider than in kennedii 

 where the posterior triangular blue spot is definitely separated 

 by dark from the narrow inferior pale margin. 



Fortunately we took a large number of this difficult s^ ,cies, 

 and this material will be so distributed as to give students 

 generally an opportunity to know the species from specimens 

 as well as from my description. It is to be hoped for the sake 

 of convenience that definite characters, in addition to those of 

 the penis, may be detected. Much of this material was col- 

 lected at the small swamp at Cumuto where we took three 

 species of Metaleptobasis, a new Telagrion, and many other 

 things (see Notes on Neotropical Dragonflics, Proc. U. S. 

 Nat. Mus., Vol. 48, 1915, p. 601). 



