Entomology of the Illinois River. 181 



A larva about an inch long, with dark piliferous spots, 

 was found Auo-. H in Quiver Lake, boring in the large 

 receptacles of Nelumbo lutea, the burrow ending at the 

 side of the receptacle in a circular opening 3 or 4 mm. 

 in diameter, about which some frass was adhering. 

 Aug. 29 the larva was found to have deserted its bur- 

 row and spun a white cocoon in one of the upper cor- 

 ners of its breeding-cage. The imago emerged Sept. 8, 

 and is identical with those described by Prof. J. B. Smith,* 

 under the name nelumhiaUs, having been reared from the 

 Egyptian lotus, at Bordentown, N. J. The descriptions 

 here given were prepared before I was aware of Prof. 

 Smith's article, which contains biological details and 

 descriptions of larva and imago, with figures of each. 



surrounded by exorementitious matter. Others had burrowed into the receptacle, often 

 hollowing out the interior of the nut-like fruit imbedded in it. One burrow was 

 •noted in a young bud. 



The cocoon was sometimes formed in the receptacle, firmly webbed to the walls of 

 the burrow, but more usually in the short burrow in the leaf stem, the opening closed 

 by a thick ivory-white lid. Several pupce were found. The terminal chitinous tuft 

 above mentioned is easily broken off in removing them from the cocoon. 



One imago appeared August 18, and another on the 26th, both clearly of the above 

 species. 



The small white cocoons of a braconid parasite were frequently noted within the 

 webs of the younger larvae, from which an imago parasite was secured on August 20; 

 and on the 22d a secondary parasite, one of the Chalcidid», came out through a small 

 round hole in the side of one of the braconid cocoons. One of the cocoons of the Py- 

 rausta was found packed with small parasitic cocoons. 



La^va. — Length 25 mm.; diameter 3 mm. Suboylindrical, thickest neiir middle, 

 tapering gently towards each end; above grayish, paler in the sutures, beneath white. 

 Head pale testaceous, marked with chestnut-brown; labrum and second antennal joint 

 brownish, clypeus and first anteunal joint whitish; middle triangle brownish anteri- 

 orly, paler posteriorly; lateral plates margined with brownish adjoining middle trian- 

 gle, and mottled with dark brown; ocelli bordered with blackish, a mottled band 

 extending back from thera, beneath it a blackish basal spot; near the middle line 

 above, a broader pale stripe each side, the two converging anteriorly, and ending near 

 the posterior angle of the middle triangle; a broad pale space each side ill front, sepa- 

 rated from the end of the pale stripe by a dark spot. Cervical shield pule brownish 

 gray, nearly semicircular, hind margin dark, sharply interrupted at middle; a more or 

 less double dark spot, and a row of three irregular clusters each side of the pale median 

 Stripe. Piliferous tubercles pale to dark brownish gray, margined with whitish, the 

 •thoracic darkest; the posterior pair on each abdominal segment quite small; seta 

 brownish. Anal plate darker medially. False feet with a black apical dot and a cir- 

 cular ring of small black-tipped teeth, the ring broader inwardly, narrower .ind inter- 

 rupted outwardly; last pair with a lunate band of teeth, and a scabrous surface between 

 their bases. 



•Ent. Amer. V., 6, p. 83. 



