118 JOURNAL New York Entomological Society. [Voi. x. 



lobes full and rounded ; clypeus narrow at base, evenly triangular, high but not 

 reaching to second joint, suture between lobes deeply indented ; occelli on black field; 

 epistoma lighter chestnut or yellowish, labram and maxilla; brown ; antennae short ; 

 spinneret large, with a long spine or thick hair. On back edge of each lobe, partly 

 hidden by segment 2, is a triangular black spot and short black line following joint 

 dorsad. Setas on head long, 'i to 2_;' thickness of head. 



Thoracic feet pale chestnut, basal joint of each whitish and defined by narrow 

 chitinous oval band, this band not complete, but absent on outer or lateral edge. 

 Shield on second segment same color as head, divided by paler dorsal line, moderate, 

 front edge straight, hind edge rounded, bears six seta; each side in usual position, a 

 larcre brown tubercle before and on a line with spiracle bears two setae ; another 

 large tubercle bearing two setae below spiracle. Segment three (mesothorax) tuber- 

 cles,ia + ib, iia + iib, iii separate, iv -i- v ; the first two and last in a vertical row, 

 iii between and caudad to iia + iib and iv -f v ; vi on center of segment just above 

 foot. The tubercles or tubercular plates are largest and darkest on prothoracic seg- 

 ment, slightly less on next and paler on metathorax, and all are darker than the ab- 

 dominal plates. 



Abdominal segments i dorsad and cephalad to ii, iii dorsad and close to spiracle, 

 iv and v united caudad and cephalad to spiracle vi above base of proleg and just be- 

 low it on base of proleg is another small tubercle bearing a single seta (vi-a?). 



Anal shield not chitinous. Abdominal tubercular plates are moderately large, 

 pale brownish-yellow. Setse are pale, rather long, about half body diameter. 

 Crochets on abdominal feet in closed circles, hooks brown. Tubercles on head look 

 like tiny globules of clear glass resting on the flatter surface, the tubercles on the 

 body tubercular plates are also tiny globules or points, from which the seta; arise. 

 Spiracles slightly elliptical and ringed with brown. 



Skin slightly granulated and covered with very minute hairs. 



Cocoon : Boat or hammock-shaped, pointed at each end, 15 to 20 mm. long, 3 to 

 4 mm. w^ide, of soft fine pure white silk of the same appearance and texture as the 

 egg-nests of some spiders. 



Papa : Bright chestnut, darker on dorsum, very smooth and rounded ; on each 

 abdominal segment dorsal surface is a finely fluted ridge, very minute hooks on anal 

 segment ; all abdominal segments free, no organs free but after dehiscence antennae 

 cases are free. 6 mm. long, 1. 5 mm. thick. 



Habits : Feeds on pith in main stalks of Carduus spinosissimiis, 

 from two or three to a dozen or more may be found in each stalk, they 

 excavate a gallery nearly its whole length, common to all ; gallery not 

 lined with silk, at convenient intervals and usually just above a new 

 joint or above where stalk branches forth are small holes, through 

 which the frass is ejected outside of the stalk. In fact an easy way 

 to ascertain if the stalks contain larvae is to examine them for consid- 

 erable masses of frass resting in the angle between the main stem and 

 branches. 



All the larvee that I observed were within the stalks, but there is 



