NO. 2192. DRAGONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 593 



yons from 1,000 to 3,000 feet deep. This west slope is a dry region, 

 except in the bottoms of the canyons, and has a famia similar to that 

 of the Coast Kanges, but at an elevation of about 4,000 feet this 

 begins to give place to the purely Canadian fauna of the crest of the 

 range. Here, at elevations of 6,000 to 10,000 feet, are found many 

 species which flourish at sea level in British Columbia, It is in this 

 Sierra region that several of these species reach their southernmost 

 ranges. 



The entire northern third of the State is unexplored as far as its 

 dragonflies are concerned. The southeastern part of the State has a 

 fauna which resembles that of the interior valleys, but is more strongly 

 Mexican. 



PALO ALTO, SANTA CLARA COUNTY, CALIFORNLA. 



Palo Alto and Stanford University are situated on the flat at the 

 southern end of San Francisco Bay. This is a plain dotted by the 

 rich green of numerous low, round-topped live oaks and, except for 

 artificial reservoirs, is dry from April to December of each year. 

 Five miles west of the University the rollhig dark green slopes of the 

 Coast Range rise to an altitude of 2,000 feet. These are covered by 

 conifers on their west slopes and in the deep moist canyons, but on 

 their drier eastern side the redwoods and firs give place to scrub oaks, 

 laurels, and dense brush. Numerous perennial torrents rush down 

 through the heavy shade of the alders in the narrow winding gorges of 

 these mountains to sink into the sand of their dry beds in the lower 

 foothills, or to be dammed up and led away in irrigation pipes. Hid- 

 den away on the high slopes of the mountains are various spring-fed 

 dams made to water stock, which have a more abundant dragonfly 

 fauna than the ponds of the flat below. Such are the "Mud Lakes" 

 of Stanford students, which lie at an elevation of 1,400 feet on the 

 ridge between Corte de Madero and Los Trancos Creeks. 



1. ARCHILESTES CALIFORNICA Mc Lachlan. 



Many specimens in the Stanford collection. Probably on all large 

 ponds in the fall. I have not collected about Stanford at this 

 season. 



2. LESTES CONGENER Hagen. 



Occasional on all ponds, 



3. LESTES DISJUNCTUS Selys. 



On the mountain ponds. Specimens from the Coast Range have 

 the pterostigmas black, the humeral stripe blue and little or no black 

 on or posterior to the second lateral suture. The appendages are 

 identical with eastern disjunctus} 



1 Specimens from the Lake Tahoe region have a broad stripe on the second lateral suture. Specimens 

 from Washington and Oregon are as black on the sides as those from the Eastern States. One Oregon 

 male has the thorax entirely black. 



65008°— Proc.N.M.vol.52— 17 38 



