NO. 2192. DRAOONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 625 



Coast Ranges it is a hot, dry region. In this interior valley several 

 Mexican species reach their northernmost range. 



The northern half of this vaUey is drained by the Sacramento 

 River, which flows south into San Francisco Bay. The southern 

 half is drained by the San Joaquin River, which flows north, empty- 

 ing into the bay near the mouth of the Sacramento. 



This southern half, usually called the San Joaquin Valley, may 

 be divided into two quite different regions: The main valley, which 

 is dry and sandy with no trees except along the river, and the delta 

 at the north end, in which is located the city of Stockton. 



STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA. 



Stockton hes out in the level San Joaquin Valley, but several 

 miles back from the river on ground above river floods. This region, 

 which is roughly coextensive with San Joaquin County, is the delta 

 of the San Joaquin River. It is a hot, level country which has been 

 reclaimed by dredgmg the numerous winding channels of this river 

 and by the building of great dikes along those channels which con- 

 fine the early summer flood of snow water. There are said to be 

 over 200 miles of these winding lateral channels of the San Joaquin 

 River, which are navigable to the odd stern-wheel steamers that 

 cany the produce of this fertile delta region down to San Francisco. 

 These winding, placid streams, brown with mud, are everywhere 

 fringed with green weeping wiUows, whose drooping branches give 

 to the region the appearance of a languor such as the gi-eat humidity 

 and heat produce in the observer. As much of this reclaimed land 

 is actually below tide, this region has been aptly termed the "Holland 

 of America." 



The collecting was done on Mormon Slough, in the heart of Stock- 

 ton, and along the river dikes west of the city. 



1. ENALLAGMA CARUNCULATUM Morse. 



Common on Mormon Slough. 



2. ISCHNURA CERVULA Selys. 



Common on Mormon Slough. 



3. GOMPHUS OLIVACEUS Selys. 



One female was caught on the river dike. This was the only one 

 seen. 



4. ANAX JUmuS (Drury). 



Occasional on the sloughs. 



5. AESHNA MULTICOLOR Hagen. 



Very abmidant on the sloughs. 



6. AESHNA PALMATA Hagen. 



Two females identified by Dr. E. M. Walker as palmaia were 

 caught on the dyke along Calaveras Creek. 



05008°— I'roc.N.M.vol.52— 17 40 



