Aui^ust — October 1S90.] 



PSYCHE, 



395 



white. Width of head 3.7 mm. Cer- 

 vical shield large, angulated at the 

 corners without any horns or spines. 

 Beneath it the head can be partly re- 

 tracted. Body angularly elevated at 

 joint 4 with a dorsal fleshy process. 

 Tails 9 mm. long, whitish above and 

 green below at the base, the rest purple 

 v\^ith black spines. Extensile threads 

 yellowish at base, then red fading to 

 yellowish again towards the ends. 

 Body green, a broad white dorsal band 

 edged with white, confusedh' striated 

 on a purple ground which soon be- 

 comes green, a little purple on joints 

 2-4, decidedly so on the anterior cor- 

 ners of the cervical shield (where it 

 shades into pinkish in the fold of skin 

 behind the head) on the hump on joint 

 4 and on joint S subdorsally in the angle 

 of the band. It begins broadlv on joint 

 2 covering the cervical shield, narrows 

 to the process on joint 4, widens to just 

 above the spiracles on joint 8 and grad- 

 ually narrows to joint 13, where the 

 anal plate is greenish. A distinct 

 white substigmatal line, edged below 

 with brown and narrowly above with 

 black, absent on joint 2 and turned up 

 at its anterior end. Man}- small lateral 

 white flecks. Spiracles, black, white 

 centrally. Thoracic feet twice lined 

 with black longitudingly ; abdominal, 

 once transversely, the claspers tipped 

 with black. Length 25 mm. exclusive 

 of the tails. The erect spines beyond 



the anus, whitish. Wlien the lar\-a has 

 finished eating, all the white of the 

 dorsal baud except its borders fades 

 out, leaving the back green and the 

 cervical shield pale blue. 



Cocoon. Formed on wood of gummy 

 silk strengthened by many little pieces 

 of bark and wood bitten oft' from the 

 inside, thus forming a hollow. It is 

 elliptical, just large enough to contain 

 the larva and becomes very hard, closely 

 resembling a lump or excresence on 

 the bark. 



Pupa. Cylindrical, tapering a lit- 

 tle towards both ends, the last two 

 abdominal segments rounded and ap- 

 pressed, the others capable of motion ; 

 no cremaster. Eyes prominent ; a 

 narrow carinated ridge runs along tlie 

 head from between the eyes to the back 

 of the place of origin of the antennae. 

 Cases creased and very minutely punc- 

 tured, not sliiny ; eyes and body sub- 

 lustrous, the latter minutely granulated 

 at the anterior Jialf of each abdominal 

 segment; spiracles distinct. Color 

 dark reddish brown, with a blackish 

 shade over the dorsum. Length iS 

 mm., greatest width 6.^ mm. Pupation 

 occurs in about two weeks after the 

 completion of the cocoon and the in- 

 sects remain in this stage throughout 

 the winter. 



Food plants. Willow {Salix)., Pop- 

 lar {Popnhis). Larvae from Dutch- 

 ess Co., N. Y. 



