622 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



6. ENALLAGMA CARUNCULATUM Morse. 



The most abundant species of EnaUagma. 



7. ENALLAGMA CLAUSUM Morse. 



A single male found among those collected about the springs. 



8. ISCHNURA CERVULA Selys. 



Common about the springs. 



9. ISCHNURA PERPARVA Selys. 



Common. A male was taken which had the coloration of Isclmura 

 demorsa (Hagen). 



10. CELAENURA DENTICOLLIS (Burmeister), 



About one warm spring this was numerous. 



11. OPHIOGOMPHUS MORRISONI NEVADENSIS Kennedy. 



A single male was caught on a gravel bar in the river, the only 

 one seen. 



12. GOMPHUS INTRICATUS Hagen. 



Several individuals were caught on the river (see p. 550). 



13. GOMPHUS OLIVACEUS NEVADENSIS Kennedy. 



Common on the river (see p. 557). 



14. ANAX JUNIUS (Drury). 



One male caught in the "AesTina swarm." 



15. AESHNA CONSTRICTA Say. 



Three females were taken here. These were verified by Dr. E. M. 

 Walker. It is the farthest southwest record for this species. Except 

 Aeshna multicolor Hagen, which was also taken around the warm 

 springs, and one of the constricta, which was taken in a greasewood 

 thicket, all the AesJina were caught in the space of an hour near the 

 large spring west of the hotel when at 6 p. m. they were flying in a 

 large "^es^Twi swarm " which was perhaps 200 feet in diameter. 

 Hundreds of Aeshna were evidently feeding on some particular swarm 

 of smaller insects and their numbers made the individuals fearless, 

 so they were easily taken. About twenty, altogether, were caught. 

 This was the only "Aeshna swarm" I have ever seen. It contained 

 four species and thinned out after an hour's vigorous net work. 



16. AESHNA INTERRUPTA INTERNA Walker. 



Several males were caught in the Aeshna swarm. No interrupia 

 nevadensis were taken at this place. They apparently belong to the 

 damper and higher Sierra. 



17. AESHNA MULTICOLOR Hagen. 



Abundant about the warm springs. This is the abundant species 

 at this point. Several were caught in the Aeshna swarm. 



18. AESHNA PALMATA Hagen. 



Several males were caught in the Aeshna swarm. 



19. MACROMIA MAGNIFICA Mc Lachlan. 



One male was observed on the river. 



20. LIBELLULA FORENSIS Hagen. 



Common about the springs. 



