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



beneath with whitish; nine short lateral, pale yellow bands; 

 horn dark green; stigmata reddish." This description answers 

 well for the ordinary form, but many of the Galapagos speci- 

 mens (and probably from elsewhere as well) are blotched 

 obliquely with chocolate brown from the subdorsal line laterad, 

 from segments 6-10 inclusive. The thorax, a part of segment 

 5, and segments 10 and 11, have also patches of the same 

 color. 



Larvae were observed in several instars at Iguana Cove, 

 Albemarle Islands, March 17-21, 1906, feeding upon Cissus 

 sicyoides, one of the VitacecB which flourished in that locality. 

 The pupa is rather dark reddish brown, with the head-case 

 obtusely rounded, and the cremaster quite stout. By digging 

 in the loose mouldy soil near some rocky barrier, a living pupa 

 and several pupa shells of lugubris were obtained. 



The moths were observed on the wing, at Iguana Cove, in 

 March, 1909, as flown specimens, the second brood coming 

 out in April and May, the pupal period for this brood evidently 

 being of short duration. 



The insect is rather partial to the more tropically-clothed 

 portions of the islands, as the "Green Zone" of the mountains, 

 and those littoral areas where fairly fresh water stands and 

 which harbor a somewhat luxurious vegetation, including its 

 food plant. 



Triptogon lugubris was observed most plentifully at Iguana 

 Cove, whence it was found to extend along the coast to Villa- 

 mil, thirty miles to the west. At the latter place, several speci- 

 mens were taken at the flowers. of Cordia lutea in the bright 

 sunshine, where they were comparatively slow in their flight. 

 However, high up on the dreary rain-sodden and vine-cov- 

 ered slopes of South Indefatigable Island, this little sphinx 

 might be seen now and then flying with great speed and with a 

 loud humming noise over the subtropical vegetation, pausing 

 but rarely to plunge out of sight into a large convolvalaceous 

 flower, but before you can scramble to it net in hand, it is 

 skimming far up the mountain side. During April and May, 

 the moth was several times observed flying low over the sandy 

 shores below Villamil settlement, Albemarle Island, and darting 



