744 ZOOLOGY INSECTS. 



slightly thickened toward base of abdomen. A small ridge-like protuber- 

 ance on the thorax, and a smaller one near the head. Color immediately 

 after change pale yellowish-green, with three narrow dorsal stripes silvery 

 white. The lateral stripes inclosing the stigmata are a little broader, 

 and bent upward anteriorly. Stigmata brownish. The neuration of the 

 wings is plainly seen, and at their base is a well defined black spot. 

 Toward the period of emergence, the chrysalis loses its bright-green color, 

 and becomes of a dark-olive hue, almost black above ; the silvery tone of 

 the stripes changing to dirty white, the coloration of the wings and various 

 organs being more distinctly seen. The chrysalis is attached to the trunks 

 of pine and fir trees, with the head invariably directed upward, and to the 

 fronds of Pteris, with the head always toward the point of the frond. 



" Length, 0.80 inch ; width, 0.15 inch. 



" I was fortunate enough to discover the chrysalis of this highly inter- 

 esting species during a recent trip to Vancouver Island, but the most dili- 

 gent search did not reward me with the caterpillar. It doubtless feeds upon 

 the Douglas spruce fir (Abies Douglasii), and should be sought for in the 



early part of July." 



PIERIS, Schrank. 



* 



P1EEIS OLERACEA, Boisd. 

 Pieris Oleracca, HARRIS, Insects Injurious to Vegetation, 1862. 



P. Oleracca I met with first near Fairplay (elevation 10,000 feet), June 

 12, where they were not uncommon at the edges of the woods. The speci- 

 mens were fresh from chrysalis, and nearly pure white below. Later in 

 June they were seen in most places where collections were made, though 

 not in very great numbers ; the species disappeared entirely by the last of 

 July, and there is no second brood. 



PIERIS PROTODIOE, Boisd. 

 Pieris Protodicc, RILEY, Am. Eut, ii, 77. 



This species occurs everywhere in Colorado below timber line, and 

 remains nearly all summer. Specimens were brought by the expedition 

 from Arizona, and it is known to occur in California. 



