PIERIS I. 



Egg. — Long, narrow, conical, the base and top flattened, depressed ; ribbed 

 longitudinally, the interspaces excavated, and crossed by numerous striaj ; of two 

 examples under view, one has the ribs rather prominent, the other flattened, 

 as are also the intervening spaces, and the middle is much swollen, after the 

 manner of an egg of Colias ; both have 14 ribs ; color when first laid yellow, 

 shortly before the end of the stage red (Figs, a a/, o? micropyle). 



Mature Larva. — Length .9 inch ; cylindrical, tapering slightly from middle 

 segment to extremity ; color light yellow crossed with stripes of black ; each 

 segment several times creased, and on the ridges so caused are small yellow tu- 

 bercles of irregular sizes, each giving out a short, fine black hair ; on all segments 

 after 2 and including 12, are two stripes to the segment ; on 3 and 4 these have 

 nearly even edges; but from 5 to 12 the anterior one has the front edge either 

 sinuous or escalloped, so that an arch falls on middle of dorsum, and sometimes 

 it is produced quite to the anterior edge of the segment, and another falls on 

 either edge of dorsal area ; usually this stripe is broken on lower part of sid^ ; 

 the stripe on posterior part of the segment is narrow and is prolonged to the 

 basal ridge ; along this ridge is a macular black band ; under side yellow-white ; 

 feet black, pro-legs yellow ; head sub-globose, granulated ; the upper front face 

 broadly black ; a black triangle over mandibles, and the ocelli are black on a 

 black bar. (Figs. J?, W, If.) From egg to chrysalis 33 days in April and May ; 

 in May and June 30 days. 



Chrysalis. — Length .5 to .53 inch ; cylindrical; the head case narrow, exca- 

 vated on either side ; a short, stout projection between the eyes ; mesouotum 

 prominent, rounded, a little cai-inated, followed by an excavation about as deep 

 as the mesonotum is high, but not evenly rounded, rather angular ; on either side 

 of dorsum, on anterior abdominal segments, are thin and angular elevations, all 

 slight, the foremost one most prominent; color dark brown; whole surface, ex- 

 cept the wing covers, covered with irregular granulations. (Fig. c.) 



This species is found Ijoth in North and South California, in Nevada, in South- 

 ern Colorado, and in Arizona. Mr. 0. T. Baron, in his excursions through North- 

 ern California, foimd Sisi/mhri abundant, and twice succeeded in bringing the 

 larvtB to maturity, and imago. Eggs laid lltli April hatched 25th. The first 

 moult took place 7th May, the second on 13th, the third 20th, and pupation took 

 place 28th May. These eggs were obtained by confining the female in bag over 

 the food-plant. 



Another lot of eggs which were found, hatched 5th May. The first moult 

 took place 14th, tlie second on 19th, the third on 25th, and pupation 4th June. 

 By Mr. Baron's observations there were but three moults. Mr. T. L. Mead, 

 in 1878, found the butterfly as well as caterpillars in Southern California, and 



