62 PROCEEDINGS OF THE CALIFORNIA 



defined black spots, around which the irrorations are thicker, forming a black 

 cloud. Under side entirely whitish green. 



Length, 1.45 inch. 



Food plant, Amorpha calif arnica, Torr. 



Chrysalis. Entirely pale yellowish green, surface slightly wrinkled, the 

 dorsal region covered with white specks. Beak very sharp, and broadly 

 keeled. Thoracic protuberance a long, acutely-edged ridge. The yellow dor- 

 sal line is visible as in the larva. When the imago is about to emerge, the 

 wing cases assume a darker shade, until the pattern and color of the primaries 

 of the perfect insect may be gradually but distinctly seen. After emergence, 

 the chrysalis case is pure white, and very transparent and glossy. 



Length, 0.95 inch. 



Width across wing cases, 0.28 inch. 



First imago appeared May 28th, the last on June 5th, the average time in 

 chrysalis state being 19 days. 



Professor Davidson read a continuation of bis papers on "Irri- 

 gation in India, Egypt and Italy." 



Mr. F. Gruber re/id tbe second of bis course of lectures on 

 ornitbology, illustrating bis remarks witb specimeus prepared 

 by biniself. This lecture treated particularly of " Birds of Mi- 

 gration and Soug." 



Regular Meeting, June 19th, 1876. 

 Vice-President Hyde in tbe chair. 



Fourteen members present. 



Donations to the Museum comprised a large gopher snake, 

 from W. G. Blunt. 



Mr. Dameron described a recent visit to Mt. Tamalpais, in 

 Marin County, which caused some discussion concerning the 

 peculiar mark on the side of tbe mountain. 



