136 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



Described from 8 6* c? in collection Barnes from Plumas County, Cal. (9,000 feet, July), 

 (Garner) ; Fort Klamath, Oreg. 



J. McDunnough.] 



[A letter from Jas. C. Cottle to Dr. Packard, May, 1904, states that a single female P. 

 shastaensis laid eggs which produced "four aberrations, two blacks and two reds." Probably 

 the forms of this moth will be found to exhibit mendelian segregation. Mr. Cottle adds that 

 eggs of P. shastaensis were laid July 12, 1902, and the larvae emerged April 21, 1903. He had 

 taken full-grown larvae and moths on the same day.] 



[James Behrens wrote, December, 1889, of a "Wonderful large-sized var. shastaensis, 

 quite black." He added: "The female shastaensis is more like the common e.glanterina, but 

 very conspicuous for its deep cherry-red tints, together with the usual yellow parts.] 



[I have received the eggs of this species from Mrs. S. J. Kidder, who has very kindly taken 

 the trouble to find them and forward them to me in good condition. They were received in the 

 fall of 1892 and hatched on May 11 following. 



Eggs. — Deposited in a ring-shaped mass around a leaf stem or twig, without covering. 

 Oval, flattened at the sides, round on the base, but flat on top, forming a distinct, elliptical 

 area, slightly depressed centrally at the micropyle. Smooth, shining, pale brown, covered with 

 a white pigment below and on the narrower sides and forming a distinct ring around the top 

 surface, inside of which is a dark brown border. Height 1.8 mm.; broad diameter centrally 

 1.6 mm., at top 1.1 mm.; narrow diameter centrally 0.8 mm., at top 0.7 mm. Duration of this 

 stage throughout the hibernating period. 



Larva. — Stage I: Head round, bilobed, shining black; antennae prominent; width 0.7-0.75 

 mm. Body dull black, feet reddish. Rows of modified processes, apparently arranged as in 

 the mature larva, but only three rows discernible. Row i very long, rather slender, the ante- 

 rior ones distinctly furcate or trifid, each branch with a very long, minutely spinulose, pale 

 seta, even longer than the shaft. The processes are shorter posteriorly, not furcate, though 

 many bear two of the long setae. Row ii shorter than i with a seta from the middle and one 

 from apex. Row iii very short, but many of the tubercles bear two setae. Anal plate concolor- 

 ous with anal feet. Duration of this stage 13 days. 



Stage II: Head shining black, labrum and bases of antennae paler; width 1.0-1.2 mm. 

 Body black, the tips of the spines straw colored. Processes very long, especially on joints 2-4 

 dorsally, where they are 1.5 mm. long. The others are nearly as long, but become gradually 

 shorter posteriorly. The processes boar about six branches and are furcate at tip, each branch 

 bearing a single pale, stiff hair, longer than the branch itself. The branches arise alternately. 

 Anal plates three, large, black; one suranal, the others at base of each anal foot. 



Stage III: Head depressed medially, shining black, clypeus whitish; width 1.4-1.8 mm. 

 The characters of the mature larva are now first seen. Body black, the processes of row i with 

 a short shaft on joints 4-12 and close-set branches, each tipped with a short, black bristle or a 

 long, pale seta. The branches are brownish yellow, contrasting with the body. The other 

 processes have a long, thick shaft and separated branches as all did in the previous stage. 

 Rather scant, pale hairs arise from the skin. 



Stage rV: Much as in the next stage, but darker, more shining, the body less hairy, and 

 without any distinct lines. Width of head 2.2-3.3 mm. 



Stage V: Head rounded, median suture deep in front, clypeal sutures double; many coarse 

 pale hairs. Color shining black, shaded with dull crimson on clypeus; width 3.7-4.5 mm. 

 Processes arranged as follows: row i subdorsal on joints 2-11, a single dorsal one on joints 12 

 and 13, none on anal plate; row ii lateral, on joints 2-13; row iii substigmatal on joints 2-13; 

 row iv above bases of legs on joints 2-4 and correspondingly on joints 5, 6, 11, and 13 anteriorly. 

 There are three forms of the processes. The first, rosette-like, has a very short shaft with some 

 50 light brown quills with short black tips, which probably produce the strong urticating effect, 

 besides a few central black branches which bear long terminal hairs. This type is found in row i 

 on joints 4-12. The second is intermediate. The shaft is long with brown quills arranged 

 around the base and some 10 black spines with terminal hairs, branching irregularly from the 



