250 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



ing 392 species, the other enumerating 140 species taken by 

 him during July, 1915, at Fallen Leaf Lake in the Tahoe 

 region. The present paper enumerates 355 species and gives 

 a somewhat similar survey of the Hemiptera of central west- 

 ern California together with a few forms taken by Mr. Gif- 

 fard in the Sierra and elsewhere. 



The material taken by Mr. Giffard was obtained during a 

 few short collecting trips he was able to make to some of the 

 more interesting and promising localities about the bay and 

 elsewhere, and altogether represents but a comparatively few 

 hours of actual work. That he was able to secure so many 

 rare and interesting species is but another indication of the 

 systematic methods of collecting which has characterized his 

 work here and on the Hawaiian Islands. His notes on food- 

 plants, habits, etc., have mostly been left for future elaboration 

 and publication. Some of the more important localities he 

 visited are listed below to save the repetition of details. 



San Francisco, collections made at Lands End, Presidio 

 and Forest Hills on various dates. 



Crystal Springs, San Mateo Co., between middle and lower 

 lakes, about west of San Mateo. 



San Mateo Co., June 17, 1917, near shore of San Francisco 

 Bay; June 20, 1917, along La Honda Road among the hills. 



Portola Valley, San Mateo Co., west of Stanford University. 



Los Altos, Santa Clara Co., July 26, 1916. 



Santa Cruz Co., on road to Great Basin, June 8, 1917, 

 1200-1500 feet elevation; June 9, 1917, 600 feet elevation. 



Monterey Co., June 10, 1917, near Del Monte; June 11, 

 1917, near Pacific Grove on sand dunes. 



Muir Woods, Marin Co., among and near the redwood trees, 

 elevation 200 feet. 



Mt. Tamalpais, Marin Co., work at West Point, 1300 feet 

 elevation. 



Dublin Canyon, Alameda Co., west of Hay wards. 



Redwood Canyon, Alameda Co., collecting at upper end of 

 canyon and on adjacent hills. 



Tunnel Road, Alameda Co., about six miles east of Berkeley. 



Contra Costa Co., along the Tunnel Road toward Walnut 

 Creek. 



