624 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



out for irrigation, one can wade back and forth across the bottom 

 of the river channel. Otherwise collecting at this point would be 

 very difficult. I collected here on August 10. 



1. ENALLAGMA CARUNCULATTJM Morse. 



Common on stagnant ditches. 



2. CELAENURA DENTICOLUS (Burmeister). 



Occasional on ditches. 



3. ERPETOGOMPHUS COMPOSITLS Hagen. 



Several were caught along the river. 



4. GOMPHUS INTRICATUS Hagen. 



Abundant along the river. Several exuviae found (see p. 570). 



5. GOMPHUS OLIVACEUS NEVADENSIS Kennedy. 



Common along the river (see p. 557). 



e. LIBELLULA COMPOSITA Hagen. 



A single female of this rare species was caught while she was 

 perched on the top of a greasewood bush. This is the only one of 

 this species I have seen alive.^ G. F. Ferris gave me a second female 

 caught at Provo, Utah. The type was taken on the "Yellowstone." 

 Others have been taken at Salt Lake City. This is the first record 

 west of Utah. Its color fits the description given by Hagen - and 

 also by Ris.^ In life its eyes were creamy white with a pearly luster. 

 It is the only white-eyed dragonfly I have seen. The Provo female 

 had a small nodal spot in each wing. 



7. ERYTHEMIS SIMPLICICOLLIS (Say). 



Common around ditches. 



8. SYMPETRUM COSTIFERUM (Hagen). 



Occasional. 



9. SYMPETRUM SEMICINCTUM (Say). 



Common about ditches. 



SAN JOAQUIN VALLEY, CALIFORNIA. 



From September 1 to 15, 1914, I made a trip down the San Joaquin 

 River to Bakersfield, thence over the mountains to Los Angeles. 

 This was very late in the odonate season, but some interesting data 

 were obtained. The records obtained around Los Angeles will be 

 reported on in my next paper, which will discuss the Odonata of 

 southern California. The following lists concern the San Joaquin 

 Valley. 



Stretched lengthwise for almost 400 miles through the central part 

 of California hes the great interior vaUey. Its floor, more level than 

 a prairie and in many places from 30 to 50 miles wide, Hes just above 

 sea level. Shut off from the cool moist winds of the Pacific by the 



» During August, 1915, 1 found Libellula composita common in Owens Valley, California. 



' U. S. Surv. Terr. Colo. (1872), p. 728, 1873. 



» Collections Selys, fasc. 11, Libellulinen, 1910, p. 267. 



