192 Psyche [December 



waved lateral lines and a third subspiraeular one, much curved; tubercles large, 

 black; slight dorsal transverse wart on the 5th abdominal segment and more prom- 

 inent conical protuberance on dorsal portion of 8th; prolegs pale with black stripes. 

 Beneath whitish with prominent black patches. Length, 10 mm. 



Stage III. Head pale, strongly lined with black, apex of lobes tipped with 

 orange behind which is a heavy black curved line; body gray-purple with distinct 

 black tubercles which at times are orange-tipped; a prominent transverse blackish 

 wart on 5th abdominal segment and a conical protuberance tipped by tubercle II on 

 8th; similar lesser prominence on the 9th; lines and stripes as in preceding stage 

 but broader and less distinct; lateral black shading below transverse wart of 5th 

 abdominal segment. Length. 18 mm. 



Stage IV. Head pale creamy strongly lined with black in front and with apex 

 of lobes tipped with orange behind which is heavy black marking. Body purple- 

 brown, the 1st abdominal segment with pale creamy suffusion between and lateral 

 to tubercles I and II, often very faint; stripes of previous stage not distinguishable 

 but the black border lines have broken up into a series of irregular dotted lines on a 

 more or less whitish ground, giving a general mottled appearance; tubercles orange, 

 tipped with black and ringed at base with white, the black color often predominating; 

 transverse wart of 5th abdominal segment black, tipped with white at apex and 

 defined laterally by the orange tubercles II; laterally to this is more or less oblique 

 dark suffusion; prominent hump on 8th abdominal segment tipped by large conical 

 tubercles II, orange in front, black posteriorly. Beneath whitish with black 

 central blotches. Length, 30 mm. 



Stage V. Head pale ochreous, pitted, marbled with purplish gray with tips of 

 lobes tinged with umber-brown, beneath which is a blackish dot and behind which 

 on the dorsal portion of the lobe is a broad black stripe slightly curved at each end 

 but not descending downwards below the level of the umber-brown area. Body 

 pale liver-brown with numerous black dots encircled with white the remnant of 

 the lines of earlier stages; tubercles coral or deep brown ringed at base with white; 

 transverse wart of 5th abdominal segment whitish strongly marbled with black; 

 6th and 7th abdominal segments laterally and posteriorly s'ightly discolored with 

 brownish; 8th abdominal segment with strong dorsal hump on which are situated 

 tubercles II, large, conical, directed backwards, umber tipped with black; spiracles 

 situated in pale area, black-rimmed; legs pink, shields of prolegs, prothoracic and 

 anal plates ochreous; filaments white; first abdominal segment between tubercle 

 II and spiracle slightly paler, the remains of the patch of the previous stage. 

 Beneath white with black and brown central blotches. Length, 60 mm. 



Food-plant: Buds and catkins of burr-oak. 



The emergence and habits of the young larvae coincide with 

 those of zoe; in all its stages the species shows a close resemblance 

 to sponsa of Europe. Ova from Truckee, Calif, and Provo, Utah 

 gave rise to similar larvae, the resulting imagines being also identi- 

 cal except that the Utah specimens were generally larger. About 

 1-4 of the Utah larvae gave the form coloradensis Beut. which is a 



