Vol. I] WILLIAMS— BUTTERFLIES AND HAWK-MOTHS 299 



and the ground color yellowish beyond the cell of the pri- 

 maries; or perhaps more commonly the pale yellow color 

 occupies the greater portion of the primaries, becoming darker 

 and mingled with fuscous basally, and at the inner margin; 

 the pattern is as in typical A. vanillce but the markings are a 

 good deal heavier. 



A. vanillce galapagensis is a fairly common butterfly, occur- 

 ring on all the larger islands of the group where it is ordi- 

 narily restricted to the dryer levels where its food-plant (Passi- 

 Hora), is to be found. The butterfly flies low and rather 

 slowly and alights but rarely. At Tagus Cove (Albemarle), 

 it was quite plentiful during March and April, both in the 

 valley and on the west slope of the high mountain which was 

 comparatively dry even to its summit, 4000 feet above the sea. 

 In a strip of vegetation at an altitude of 1500 feet where 

 PasMora was abundant, a few larvae of this butterfly were 

 seen. They were mostly in the final instar, and from them, I 

 succeeded in rearing but one butterfly, the other larvae perish- 

 ing before pupation. 



The butterfly was observed perhaps most plentifully on the 

 rounded summit of Charles Island (May and June). On this 

 island, during the month of October, 1905, a female was 

 observed ovipositing in the dry thickets, and this would sug- 

 gest that the species passes the dry season in the egg state or 

 as very young larvae.^ Occurs on Charles, Chatham, Inde- 

 fatigable, Albemarle, James, Narborough, and Abingdon 

 Islands. It may also occur at times, on some of the other 

 islands. 



Alar expanse: $ 45, 49, 49, 50, 52, 53, 54, 55, 57, 58, 60, 

 60=53.5 mm. 



9 48, 52, 52, 54, 55, 55, 55, 56, 60, 61=54.8 mm. 

 22 specimens. Plate XX, figs. 1-2. 



3. Pyrameis huntera Fabr., Syst. Ent., 499, 1775. 



One fresh specimen, taken on the treeless summit of Villamil 

 Mountain, 3000 feet altitude (Albemarle Island), August, 

 1906. The insect is typical and expands 52 mm. Several 



1 Collected on the Albatross Expedition in 1888 and 1891 (where it is referred to by 

 A. Agassiz as Argynnis), the Hopkins-Stanford Expedition, and perhaps also on some 

 of the earlier expeditions. 



