336 PIWCfEEDINGS OF THE NATIONAL MUSEUAI. vol.49. 



is very similar to that of an Enallagrna. The anterior edge is pro- 

 duced forward and downward into an acute angle. Three mental 

 setae on each side; six long raptorial setae on each lateral lobe. 

 Each lateral lobe terminates distally in a hook, which is separated by 

 a deep cleft from the terminal row of five short teeth. 



The legs are moderate in length, with three low keels on femur and 

 tibia. Wing cases long, reaching to the middle of segment 4, slender 

 and held parallel. Abdomen with large lateral keels, which are dentic- 

 ulate with minute teeth. (See fig. 188.) Gills (see figs. 185 and 187) 

 oblanceolate. 



The coloration is so obscure that I will not attempt to describe it. 



The nymph is of a generalized form lying near to the nymphs of 

 Endllagma, but is peculiar in having the denticulate lateral keels. 



These specimens are deposited in the United States National 

 Museum, 



5. AMPmGRION SAUCIUM (Bunnelstcr). 



This species was common, but nowhere in swarms as it is frequently 

 found in such situations. 



6. ISCHNURA CERVULA Selys. 



One or two individuals of this species were taken each day. The 

 meadows were probably too high and cold for it. 



7. ISCHNURA PERPARVA Selys. 



A few specimens of this were taken. 



8. OPmOGOMPHUS MORRISONI Selys. 



One specimen, a male, was taken on a sandy bank of the river. 

 Two other specimens, probably this species, were seen on Mr. Shon- 

 quest's corduroy road. 



9. ANAX JUNIUS (Drury). 



One specimen was seen late in the afternoon beating back and 

 forth over one of the sloughs. 



10. AESHNA INTERRUPTA INTERNA Walker. 



One female was taken in the timber near the meadows. As this 

 was a teneral and, excepting one male, the only Aeshna seen, it was 

 probably early for Aeshnas. 



11. CORDULIA SHURTLEFFI Scudder. 



One male taken over a grassy slough near Mr. Shonquest's bridge. 

 A female was taken in the bushes just above Denham Falls. 



12. SOMATOCHLORA SEMICIRCULARIS (Selys). 



This species was very common over those grassy sloughs in which 

 sedges grew up through from 6 inches to 2 feet of water. Usually, too, 

 these were surrounded by timber in which the Somatochloras took 

 occasional side flights, especially late in the afternoon, when they 

 seemed to prefer the sumiy tops of the trees to the cooler sloughs. 

 I took 80 males and only 2 females. The females were probably more 

 abundant, but because of their gray colored eyes and plump abdomen 

 they were indistinguishable from the swarm of Lihellula quadrimaaw- 



