Vol. I] WILLIAMS— BUTTERFLIES AND HAWK-MOTHS 311 



deep black curved line extending from the insertion of the anterior wings 

 about two-thirds of their length. Abdomen light gray, almost white, orna- 

 mented by two large tufts of black hair at base, and by a narrow dorsal 

 hne consisting of a black dash upon each segment. Each segment is further 

 margined by a transverse line of black at its insertion, and the second, 

 third, and fourth are mark'ed by lateral spots of pale yellow surrounded 

 with black. 



Under Surface — Palpi, thorax, and abdomen snowy white. Upper ends 

 of tibiae and tarsi light brown, ringed with white. Wings gray, obscurely 

 marked, and banded as on upper surface. Expanse of wings, 90 mm. 



Described from one female specimen in fair condition, labeled 'Gala-- 

 pagos, Charles Island.' " 



Rothschild and Jordan's description : 



"52 smaller and paler than Rustica rustica. The tenth abdominal ter- 

 gite of the $ not so distinctly sinuate, and harpe shorter than in Rustica 

 rustica, otherwise the same. In Tring Museum 2 $ $ , 2 9 2, Chatham 

 Island, 14, III, 1901 (R. H. Beck) ; Charles Island (Markham)." 



The insect is quite variable, the female described by Holland, 

 is evidently a pale specimen, while the sphinx referred to by 

 him as being "too badly worn to permit of a proper descrip- 

 tion," may belong here. While some of the specimens in the 

 California Academy of Sciences' collection, approach the var. 

 nigrita R. & J. quite closely, they can be separated from it by 

 the constant presence of the ochraceous coloration, and usually 

 by the conspicuous yellow abdominal spots which are wanting 

 in nigrita. A male calapagensis from Charles Island, is very 

 heavily marked with ochraceous; in several other specimens, 

 this color is scarcely observable; while in the duskiest indi- 

 viduals, the yellow abdominal spots are almost obsolete. 



Mature larva — Head pale green, body paler green, roughly 

 granulated, the granules yellowish white and most prominent 

 on the thorax, where they are arranged in a subdorsal row with 

 rnore or less scattered granules between. Seven oblique stripes 

 of purple lake, below which are cream colored stripes ; stigmata 

 with yellow discs. Tarsi black, with one or two pale yellow 

 granules basally ; anal horn stout and curved, yellowish, rough- 

 ened with tubercles. Approximate length 70 mm. Described 

 from several well preserved alcoholic specimens. 



Considerable color variation exists among these larvae ; some 

 of them have a yellowish ground color, others are adorned with 

 large purplish patches, while fewer are blackish purple, the 

 head being purplish with green about the clypeus. In all cases, 

 the granules are conspicuous and of a pale yellowish color. 



