April 1S93.J 



PSYCHE. 



439 



dorsal brush-shaped tuft and on joints 6-8 

 white ones, which arise from the warts of 

 row i and the upper part of row ii. The 

 white ones are less well developed than the 

 black one. Other hair black and white, 

 yellowish dorsally on joints 3 and 4. 



Fourth stage. — (All $ andsome $ larvae.) 

 Much as before ; width of head 1.8 mm. The 

 brush tufts are larger than before but not full 

 size and thev are colored the same. The 

 warts of rows ii and iii are bright blood red, 

 row v brown. (Row i and iv are so small as 

 to be inconspicuous.) The body is colored 

 as before, but the yellow dorsal band is divided 

 by a black dorsal line and there is a broken 

 lateral and substigmatal line. Abdominal 

 feet reddish at tip. 



(Most $ larvae.) Differ in the greater 

 length of the hair pencils while the four brush 

 tufts are large, nearly alike and all colored of 

 a silvery gray, in some specimens blackish 

 or even black on the crest, but white on the 

 sides, in others nearly all white. In one ex- 

 ample, the one on joint 5 was slightly darker 

 than the others. The yellow marks are more 

 reduced than in the $ larva, consisting of a 

 subdorsal, lateral and substigmatal row of 

 irregular subquadrate spots. On completion 

 of this stage the $ larvae spin their cocoons. 



Fifth stage. — (All ? and a few $ .) Head 

 black, the labrum and bases of antennae pale 

 yellow; width 1.7-3.0 mm. Body black, with 

 the dorsum of joints 3 and 4 largely ochreous 

 yellow except a black dorsal line, continued 

 to joint 12 in a row of subdorsal yellow spots, 

 irregularly elongated transversely and con- 

 necting over the back posteriorly on the seg- 

 ments ; similar lateral and substigmatal rows 

 the latter most continuous. Hair pencils 

 from joints 2 and 12, 2.5-4 mm. long, the one 

 on joint 12 preceded by a tuft of shorter hairs. 

 Brush tufts large, all uniform gray, in some 

 darker on the crest, in others nearly white. 

 The lateral region is irregularly tinged with 

 ashy gray, largely so all over joint 13. Ab- 

 dominal feet crimson. The warts are ar- 

 ranged as follows. On joint 2, rows i and ii 



minute on cervical shield, iii large, bearing 

 the pencil, vi stigmatally; on joints 3 and 4 

 rows ii— vi, row iv being rudimentary, on 

 joints 5 and 6 rows i-viii, row iv is rudimen- 

 tary, behind the spiracles and rows vii and viii 

 larger, on the venter; on joints 7-10, rows i— vi, 

 rowiv minute; on joint 11 like joint 5 ; on joint 

 12 rows i-v, vii and viii, row iv being minute 

 and vi absent; on joint 13, rows ii, iii, v, 

 vii and viii. Warts i-iii are bright red, but 

 row i is so small as hardly to be seen ; row 

 iv is reduced to whitish spots bearing a few 

 very inconspicuous hairs and row v is brown, 

 while row vi is whitish with minute black 

 tubercles, but is inconspicuous on account of 

 its subventral position, though the warts are 

 large. This is the last stage for $ larvae. 



Cocooii. — Elliptical, thin but opaque, com- 

 posed of silk and the larval hairs, one end 

 being left partially open to facilitate the ejec- 

 tion of the cast skin. 



$ pupa. — Cylindrical, rounded and blunt 

 anteriorly ; abdomen tapering; cases promi- 

 nent; cremaster long, but thick, terminating 

 in hooks which adhere to the silk of the co- 

 coon. Length 12 mm., width 4 mm. Color 

 black, shiny, except the back which is brown- 

 ish and the abdominal incisures which are 

 nearly white. There are several rows of flat 

 granular areas which represent the larval 

 warts and bear a few hairs, and three dorsal 

 tufts of short dense white hairs* on the sec- 

 ond to fourth abdominal segments, repre- 

 senting the brush tufts. Duration of this 

 stage 18 days. 



$ pupa. — Abdomen large, thorax small, 

 cases moderately large but slight. Color 

 dark brown, nearly black on the back, orna- 

 mented as the $ pupa, but the dorsal struc- 

 tures representing the larval tufts are on 



* Under the microscope these structures present a 

 curious appearance. They are not a tuft of hairs, but 

 an irregular yellowish gelatinous mass, of a square 

 shape but irregular surface above, divided to the body 

 on the dorsal line and seeming to contain a few hairs, 

 besides several long ones similar to those over the rest 

 of the surface. 



