182 Illinois State Laboratory of Natural History. 



The other imagos in our collection were taken at electria 

 lisrhts in Urbana May 19 to Aug. 6, with the exception 

 of a single well-marked example, bred July 21 from a 

 larva which was found near the University July 9, boring 

 in the stems of Polygonum incarnatum. There is no Ne- 

 lumbo near Urbana. The moths taken at lights were 

 all more or less worn when captured. 



Larva. — The cast skin shows that the larva had six 

 ocelli on a side, three in a vertical row behind the antenna, 

 the adjoining surface slightly darker, one above these but 

 a little further back, one directly behind it, and one 

 directlj'' behind the lowermost, all equidistant; apex of 

 mandibles nearly truncate, with five nearly equal blunt 

 teeth; skin minutely granulate; spiracles surrounded by 

 prominent brownish rings ; claws lobed at base. 



Cocoon. — This is grayish white, densely woven and 

 papery, thickly covered without with small woody par- 

 ticles firmly attached to it, probably gnawed from the 

 side of the breeding- cage. 



Pupa (described from cast skin of female).— Length 

 12 mm., greatest diameter nearly 3 mm. Subcylindrical, 

 tapering posteriorly from fourth abdominal segment; 

 entire surface very minutely scabrous and subopaque, 

 finely transversely wrinkled except on the wing-pads and 

 apical part of abdomen. Head rounded in front, wing- 

 pads extending about to apex of fourth segment, hind 

 wings narrowly visible on dorsum from their bases to 

 the third abdominal segment. Segments 2-4 of the ab- 

 domen are one half longer than segments 1 and 5-7, 

 and segments 8 to 10 somewhat shorter than the 

 latter; segments 5 and 6 are free. A row of four dark 

 minute shining piliferous spots, each with a fine yellow- 

 ish hair, extends across each segment anteriorly, the 

 outer ones just above the spiracles. Spiracles of second 

 and third abdominal segments large and transversely 

 oval, surrounded by a sharp raised margin ; those on 



