248 



U. S. NATIONAL IVIXJSEUM BULLETIN 209 



Springs, San Francisco County, Santa Cruz, Sobre Vista in Sonoma 

 County, Strawberry, Tamales Bay, Wells, and Wildcat Canyon in 

 Contra Costa County); Idaho (Moscow); Nevada (Wells); Oregon 

 (Crater Lake, Crescent, Diamond Lake in Douglas County, Enter- 

 prise at 3,750 ft., and Eugene); Utah (Provo) ; and Washington 

 (Nelsons, Pullman, Steverson, and Yakima). 



Collection dates are from Mar, 15 at Mill Valley, Marin County, 

 Calif., to Oct. 23 at San Francisco, Calif. Most are in June, July, 

 August, and September. Flower records comprise Eriogonum and 

 Achillea lanulosa. 



\ f 



Figure 144. — Localities for Ceropales maculata strekhii. 



This subspecies occurs most typically throughout California east 

 of the crest of the Sierra Nevada, though in northern California and 

 in the Coast Range specimens of the subspecies fraterna and inter- 

 grades are common. It extends northward with more pronounced 

 dilution with fraterna into British Columbia and westward to Idaho 

 and northern Nevada and Utah. Adults are commonest during the 

 summer and early fall. 



ROBINSONII GROUP 



Forewing 5,5 to 16 mm. long; body of medium build; antenna of 

 moderate length; hind legs long; longer hairs of frons suberect, rather 

 short and sparse; longer hairs on mesoscutum short, inconspicuous; 

 second to fourth segments of fore and middle tarsi of male not unusu- 

 ally short, the second segment of the middle tarsus distinctly longer 

 than wide; hind tarsus unusually long; last segment of fore tarsus of 

 male with a strong median thumbhke lobe on the front side; claws on 

 fore and middle tarsi of male with a large, appressed, obliquely trun- 

 cate tooth, the tooth postmedian on the claws of the middle tarsus and 

 on the hind claw of the front tarsus, shorter, more pointed, and sub- 



