606 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



TEHAMA, TEHAMA COUNTY, CALIFORNIA. 



On June 16 1 tried collecting at Tehama, but the temperature was 

 112°, and both the Sacramento and Mill Creek (Los Molinas) were 

 too high for collecting. 



On July 15 I started on a collecting trip from Sacramento up the 

 American River to Auburn across the Sierras to Lakes Donner and 

 and Tahoe, thence to Reno, Pyramid Lake, and the Humboldt River 

 in Nevada. 



AMERICAN RIVER, SACRAMENTO, CALIFORNIA. 



Sacramento lies at the juncture of the Sacramento and American 

 Rivei-s. Here as far as the eye can see the valley is perfectly flat 

 and is flooded annually by the Sacramento River. To one approach- 

 ing Sacramento only the second stories of the houses and the tops of 

 the numerous shade trees are visible for it is entirely surrounded by 

 a great 20-foot dyke, through which the railroads enter by flood gates 

 that can be closed in times of high water. The American River at 

 the tune of my visit was about 300 feet wide, with half the bottom 

 exposed as sand bars; the 15-foot banks, as well as the entire bed, 

 were composed of loose sand. Opposite the city, where I collected, 

 the bottoms were a jungle of box elder trees about 30 feet high, except 

 for a few cottonwoods along the bank and an occasional more open 

 glade occupied by willows. The river itself, even among the cotton- 

 wood trees, was fringed with willows. The sloughs mentioned in the 

 following list were in the bottoms back some distance from the river. 

 No collecting was attempted on the Sacramento River at this place. 



1. HETAEIUNA AMERICANA (Fabricius). 



Not common. On river. 



2. LESTES CONGENER Hagen. 



Some about sloughs. 



3. ENALLAGMA CARUNCULATUM Morse. 



Common about sloughs. 



4. ISCHNURA CERVULA Selya. 



About sloughs. 



5. ISCHNURA PERPARVA Selys. 



About sloughs. 



6. OPHIOGOMPHUS OCCIDENTIS CALIFORNICUS Kennedy. 



One male taken in a willow glade opposite the city. 



7. GOMPHUS OLIVACEUS Selys. 



This species was very abundant on the American River opposite 

 the city. None were found except in the half mile between the two 

 railroad bridges. Tlie males were abmidant over the swift muddy 

 water or resting on the overhanging willows. Tlie females were 

 caught in the willow glades back from the bank. (See page 554.) 



