248 LEPIDOPTERA OP NORTH AMERICA. 



NAD ATA Walker. 



Body moderately stout, pilose ; hairs rather smooth. Proboscis 

 distinct, shorter than the breadth of the head. Palpi porrect, 

 rather slender, not extending beyond the head ; second joint full 

 twice the length of the first ; third minute conical. Thorax highly 

 crested ; the crest terminating in an acute cone. Legs rather 

 slender, pilose ; hind tibiae with four long spurs. Wings rather 

 broad. Fore wings with slight undulations along the exterior 

 border, slightly acute at the tips; three inferior veins; first and 

 second connected at the base ; third rather remote. Male. An- 

 tennce moderately pectinated, more than half the length of the 

 body. Abdomen not extending beyond the hind wings. Fore 

 wings almost straight along the costa, exterior border less oblique 

 than in the female. Female. Third joint of the palpi more acute 

 than in .the male. Antennse simple, hardly more than half the 

 length of the body. Abdomen extending for one-fourth of its 

 length beyond the hind wings. Fore wings slightly convex along 

 the costa. 



1. N. gibbosa Sm. Abb. Figured in Sm. Abb. pi. 82. 



Tawny, whitish testaceous beneath. Fore wings very minutely 

 covered with ferruginous flecks ; a slightly oblique ferruginous 

 band at one-third of the length, and another more oblique, at a 

 little beyond two-thirds of the length ; the outer border of the 

 latter is more or less paler than the rest of the wing ; two white 

 discal dots, one behind the other, exterior border with whitish 

 marks. Hind wings testaceous, whitish towards the costa, and 

 with a slender indistinct tawny somewhat undulating discal band ; 

 exterior margin slightly tawny. Length of the body 7^ — 10 lines; 

 of the wings 20 — 24 lines. 



United States. 



Walker. 



Fam. ARCTIIDAE Herr.-Schaep. Chelonides Boisd. 



Stature robust ; ocelli conspicuous ; maxillae short sub- 

 membranaceous, sometimes obsolete. Antennae moderate, 



