32 ENTOMOLOGICAL NEWS. [Jan., 'lO 



The Flora of San Francisco has been thoroughly worked out 

 and listed by Mrs. K. Brandegee (Zoe, vol. 2, No. 4, pp. 334- 

 386, 1892), but the butterflies only incompletely so by Dr. 

 Behr in his "Fauna and Flora of California." 



The climate of San Francisco is rather cool, with an abun- 

 dance of sea fog and strong northwest winds in the summer 

 time ; the country immediately south of the city being likewise 

 on the narrow peninsula much resembles it in physical aspect 

 and otherwise; while to the north the higher and warmer ele- 

 vations of Marin county, separated from San Francisco by the 

 narrow straits, offer a greater variety of vegetation, more 

 salubrious climate and many protected canyons free from fog 

 for the richer insect fauna that inhabits the region. 



The list given below contains the names also of those but- 

 terflies which once dwelt within the precincts of our city, but 

 that at the present time are thought to be extinct here, or are 

 so in fact. 



1. Danais plexippus Linn. 



Tiehr says of this butterfly (Fauna and Flora of Cal., Vol. 5, 

 2nd series, pp. 371-2, 1895) : "Rare in the vicinity of San 

 Francisco up to 1856, when suddenly great numbers appeared 

 in the streets of San Franicsco. Since 1880 they have not vis- 

 ited the city." This butterfly is frequently seen in San Fran- 

 cisco, especially in the fall of the year, when it sometimes is, 

 as at this writing (September, 1909), quite plentiful. The 

 larva has been found in the nearby city of Oakland, and though 

 it does not breed regularly in San Francisco, Dr. Behr re- 

 ports finding a larva of this insect feeding on Gomphocarpns 

 curassavlcus, an exotic asclepiad which was growing in a 

 garden. 



2. Brent his epithore Bdv. 



Taken a good many years ago by Messrs. Cottle and Muel- 

 ler in the commencement of Golden Gate Park, but not met 

 with since. 



