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



taken throughout the night, at a campfire, on the mountain 

 slope. 



There were but few larvse of this species to be found by the 

 end of March, but the evidence of their ravages was discernible 

 on their food plant, a species of Asclepiad vine (Asclepias 

 angustissima) , which was abundant at Tagus Cove, especially 

 on lava. As in D. ello, there are two color forms of the larva, 

 one being purplish gray, the other pale green. There is no 

 pink spot on the third and fourth segments as in D. ello, and 

 the anal horn is quite short. 



The insect has been taken only on Albemarle Island. 



Alar expanse : $ 56, 59, 60, 62=59.25 mm. 



5 54, 57, 58, 58, 59, 60, 60, 60, 60, 60, 60, 60, 60, 61, 61, 

 62, 62, 62, 62, 62, 62, 62, 62, 63, 63, 63, 63, 64, 64, 65, 66= 

 61.12 mm. Plate XX, fig. 11. 



6. Phlegathontius rustica Fabricius, Syst. Ent., 540, 1775; 

 var. calapagensis Holland, Proc. U. S. N. M., XII, 195, 1889 

 (Galapagos, Charles Island). 



Sysygia galapagensis Kirby, Cat. Lep. Het. I, p. 685, No. 2, 

 1892 (Galapagos). 



Protoparce calapagensis Rothschild and Jordan, Novitates 

 Zoologicse, Suppl. Vol. IX,^ 85, 1903 (Charles and Chatham 

 Islands, Galapagos). 



This common Galapagos Sphinx was first described by Hol- 

 land, from one 9 secured on the Albatross Expedition, in 

 1889. He thinks it entitled to specific rank, but Rothschild and 

 Jordan in their great work on the Sphingidae of the world, 

 consider calapagensis a subspecies of rustica. 



Holland's description of calapagensis reads : 



"Protoparce calapagensis sp. nov. (Holland). Upper surface — Anterior 

 wings white, traversed by double, undulate, black transverse anterior, pos- 

 terior, and submarginal lines, the latter terminating near the exterior angle 

 in a conspicuous black spot. A row of marginal black spots, those nearest 

 the apex protracted in the form of dashes; the second from the apex 

 coalescing with the submarginal line, further ornaments the wing. 

 Fringes white, interrupted at the end of the nervures by black. The discal 

 dot is pure white, large, narrowly margined with black. Upon the costa, 

 near the base, is a black dash, followed by some confused "pepper and salt" 

 markings near the transverse anterior line. Posterior wings gray, shading 

 into white at anal angle, and traversed by three black bands, of which the 

 two on the discal space are narrow, while the submarginal band is broader, 

 widening rapidly from the anal angle toward the anterior margin. Head, 

 antennae, and thorax white. Patagiae white, marked in the middle with a 



