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



In some specimens, the diaphanous spots are smaller and 

 the lilac bands on the underside tend more to a pale bluish or 

 lavender, or rarely are replaced by lighter brown or yellowish 

 scales. The insect much resembles E. Santiago but is not quite 

 so dark as that species and the spots, similarly disposed, are 

 usually larger. Below, the pattern agrees rather closely with 

 that of Santiago, but the latter replaces the lilac of galapagensis 

 with purplish. The purplish and pale scales are in smaller 

 proportion in Santiago and the tails of the latter are longer. 



Type 1 $ (Chatham Island 700 ft. altitude, October 15, 

 1905), and 1 9 Tagus Cove, March- April, 1906, Galapagos, 

 in possession of the California Academy of Sciences. Cotypes, 

 1, Phil. Acad. Sci. ; 10, Cal. Acad. Sciences. 



One pupa of this butterfly found lying exposed on the 

 ground at Banks Bay, Albemarle Island, in April, 1906. 

 Pupa : Of the usual stout Eudamus form ; rugose under a lens, 

 pale brown speckled with darker brown, a brown stripe above 

 the spiracles. Head very nearly as wide as thorax, not very 

 convex on vertex giving it a square aspect. Cremaster darker 

 brown, rounded at extremity, excavate ventrad. Length 16 

 mm,, width at shoulders 5 mm. Pupa preserved in spirits. 



This is a common Skipper, especially on Chatham and Albe- 

 marle Islands, appearing quite early in the season, being rather 

 distinctly double-brooded, the first flight beginning in January 

 or thereabouts, while the butterfly again makes its appearance 

 in the dry season, in about August. Seasonal conditions often 

 vary somewhat on different islands and different slopes of the 

 group, and this makes it rather difficult to determine the 

 number and time of appearance of the insects there. The 

 seasons then are not strictly contemporaneous in the Archi- 

 pelago. During April, 1906, the skipper was fairly abundant 

 at Bank's Bay (Albemarle), and half- to full-grown larvae 

 were found feeding on a trifoliate leguminous annual; the 

 larvae making a sort of nest for themselves with the leaves 

 after the manner of other members of the genus. The butter- 

 fly has a swift flight, and when it occurs in the dry and almost 

 barren lava beds (as it frequently does), it likes to alight in 

 the shade of some projecting piece of rock. Such localities, 



