DRAGONI^UES AND DAMSELFUES IN PONDFISH CULTURE. 259 



LESTES UNCATUS Kirby. 



Lestes uncatus Kirby, Synonymic Cat., 1890, p. 160. 



A single male of this species was captured in one of the runs that stretch back onto the prairie 

 August 10, 1917. The species can not be at all common in this vicinity, since this is the only specimen 

 secured during four years of collecting. 



ISCHNURA (NEHALENNIA) POSITA (Hagen). 



Agrion positum Hagen, Synop. Neurop. N. A., i86*, p. 77. 



Needham (1903, p. 260) places this species in the genus Ischnura "chiefly because of the form of 

 the abdominal appendages in the male and the small round postocular spots." Like verticalis, it 

 appears early in the spring and continues until late in the fall, and its nymphs are associated with 

 those of verticalis in the ponds. In habits and in their relation to the fish life of the ponds the two species 

 may be treated as one. 



NEHALENNIA IRENE (Hagen). 



Agrion irene Hagen, Synop. Neurop. N. A., 186 1, p. 74. 



This tiny species is associated with Lestes, frequenting the grass and vegetation in damp places. 

 Like Ischnura, it feeds upon gnats and midges. Neither the imagos nor the nymphs occur in sufficient 

 numbers to affect the life of the ponds. 



AMPHIAGRION SAUCIUM (Burmeister). 



Agrion saucium Burmeister, Handb. Entomol., vol. II, 1839, p. 819. 



A male and two females of this species v/ere captured around the ponds below the railroad track 

 July 26, 1917; none had ever been seen near the ponds in series D. However, this species is sometimes 

 found in great numbers, and it may be that once obtaining a start here they will increase sufficiently 

 to rank alongside the Enallagma species. 



