156 



LEPIDOPTERA OF NORTH AMERICA. 



Larva, the head is moderate and the body is naked, wrinkled 

 transversely, and tapers gently from the fourth segment, and is fur- 

 nished with a lenticular tubercle on the eleventh segment instead 

 of a caudal horn. Its position when disturbed is not sphinx-like ; 



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it shortens the anterior rings and throws the head from side to side, 

 making at the same time a crepitating noise. When on the ground, 

 its motions under irritation are often violent. It prepares for pu- 

 pation on or near the surface of the ground. 



1. T. abbotii Swainson. Figured in Swains, pi. 60. 



Head, palpi, and thorax, dull chocolate-brown ; prothorax with a 

 blackish-brown transverse line, and two others crossing the middle of 

 thorax ; abdomen dark-brown, lighter in the middle ; terminal tufts 

 dull yellowish-brown in the male, and female with a large light-yel- 

 lowish central pencil, and small lateral brownish ones. Anterior 

 wings dull-chocolate brown, lighter beyond the middle, even yel- 

 lowish-brown in the female ; an oblique dark-brown line passing 

 behind and near to the minute dark-brown discal dot; several dark- 

 brown lines on the inner margin, and curving obliquely to the 

 lower part of medic-superior nervule, and proceeding thence to the 

 costa as sharply-angulated lines, and long dark-brown dashes pro- 

 jecting upward in the interspaces ; apical interspace grayish- 

 brown, with a dark-brown sagittal dash on the margin, and others 

 in the three following marginal interspaces : fringes dark-brown. 

 Posterior wings sulphureous, with a dark-brown terminal band, 

 breaking into a series of short lines in a slightly roseate space 

 above anal angle ; fringes brown. 



Mature Larva. Male, head dark-brown, banded broadly at sides 

 with light-green, and with a narrow central, short greenish band. 

 Body reddish-brown, with numerous patches of light-green, oval on 

 the dorsum, and irregularly triangular on the sides, with an inter- 

 rupted, subdorsal chocolate-colored line. The lenticular tubercle 

 on the eleventh segment is black, encircled at the base by a yellow- 

 ish line and a blackish cordate patch ; anal shield pale green ter- 

 minally, and brown above, crossed by irregular brown lines. Fe- 

 male, body uniform reddish-brown, or blackish-brown, immaculate; 

 with interrupted dark-brown subdorsal lines, and numerous trans- 

 verse striaB. Length about three inches. Swainson's figure of this 

 larva is erroneous. 



