288 



the middle of the posterior half. Tail blunt conic, terminated by a number 

 of straight adminicula, abruptly ending in a hook at their apices. 

 Imago. July 26th to Aug. 5th. 



Euchsetes Egle Drury. [PI. n, fig. 5.] 



Inhabits Asclepias syriaca. Gregarious, feeding in parallel lines or files 

 on the under side of the leaves, eating the leaves from the edges, Aug. 20. 



Body black, with a whitish lateral line, second and third segments each 

 with four black .pencils curving over the head; fourth with two black pen- 

 cils and two shorter white ones on the back, and a horizontal, long, white 

 pencil on each side; fifth to ninth segments each with a dark orange and a 

 pale yellow, incurved tuft on each side of the back, and a lateral, horizontal, 

 black pencil; tenth segment with a dark orange and a white, incurved tuft 

 on each side of the back, and a horizontal, white pencil on the side of the 

 body ; eleventh segment with two black, connivent pencils, and two incurved, 

 white tufts on the back, and a lateral, horizontal black pencil; twelfth seg- 

 ment with two incurved, black tufts. The tufts and pencils all proceed from 

 small tubercles; the dorsal pencils and incurved tufts conceal a series of deep 

 black, much shorter tufts, and the lateral pencils and tufts are surrounded 

 by little whitish hairs diverging in a stellated manner, and the sides of the 

 body below the horizontal pencils are also covered with these little stellated 

 tufts of whitish hairs. Head black, with the lip and base of the antennas 

 Avhite. Legs black. 



Larva. Found on Asclepias syriaca. Gregarious, particolored. 

 Head and body black, with a narrow, white, lateral line and sixteen legs. 

 Head incurved, and first four segments arched upwards, in repose. Each 

 segment with a transverse series of short, stellated tufts of whitish hairs; 

 second and third segments each with four black pencils curving over the 

 head, and nearly horizontal in repose; fourth segment with a short, dorsal 

 tuft of black hairs, covered on each side by an erect, conniving pencil of 

 black hairs before, and a shorter, incurved, white tuft behind; a horizontal 

 white pencil on each side above the white lateral line ; fifth to ninth seg- 

 ments, inclusive, each with a dorsal black tuft, covered at the sides before 

 by a dark orange, and behind by a lighter orange, or pale yellow, incurved, 

 logger tuft ; on each side above the white lateral line a horizontal black pen- 

 cil ; tenth segment with a central black tuft, covered before by a deep 

 orange, incurved tuft, and behind by a snow white one, also incurved or 

 connivent, and on each side, instead of the black horizontal pencil, a longer 

 white pencil. Eleventh segment with a dorsal black tuft covered, as on the 

 fourth, with two erect, connivent (but not incurved), black pencils before 

 and shorter, white, incurved ones behind; lateral pencil black. Twelfth or 



