58S AN INTRODUCTION TO ENTOMOLOGY 



QQ. Antennas not clubbed. 



R. Dorsal surface of the first abdominal 

 segment with two prominent rounded 

 bosses, the hoods of the tympana. 

 These hoods are wholly above the 

 spiracles, and separated by only about 

 one-third of the width of the abdomen. 

 Black moths with white or 3^ellow 

 bands or spots on the wings and often 

 with metallic tints. Found only in the 

 Far West or in the Gulf States, p. 698. 



Pericopid^ 



RR. Hoods of the tympana less con- 

 spicuous dorsally and more widely 

 separated. 



S. Veins Sc and R of the hind wings 



extending separate, or the two joined 



for a short distance near the base of 



the wing; ocelli present. 



T, White or yellow species, with 



palpi not reaching the middle of 



the smooth-scaled front; vein Cu 



apparently four-branched in both 



fore and hind wings (Haploa). 



p. 700 Arctiid^ 



TT. Species with longer palpi, and 

 vein Cu of the hind wings ap- 

 parently three-branched, or species 

 of a gray ground color, p. 683. 



NOCTUID/E 



SS. Veins Sc and R of the hind wings 

 fused or closely parallel near the 

 middle of the discal cell, or con- 

 nected by a short - cross-vein (the 

 free part of vein Ri); ocelli absent. 

 (See also SSS.) p. 679. Lymantriid^ 

 SSS. Veins Sc and R of the hind 

 wings united for one-fifth or more of 

 the length of the discal cell. 

 T. Ocelli present (Arctiinas). p. 700. 



Arctiid^ 



TT. OcelU absent. 



U. Fore wings with raised tufts of 

 scales (NolincE). p. 705. Arctiid^ 

 UU. Fore wings smoothly scaled. 

 V. Vein AI2 of the hind wings 

 well developed and aris- 

 ing slightly nearer to vein JMj 

 than to vein Mj (Menopsimus). 



p. 683 NOCTUID^ 



VV. Vein M2 cf the hind 

 wings arising much nearer to 

 vein AI3 than to vein Mi, or 

 wanting (Lithosiinae). p. 704. 



Arctiid^ 



J J. Frenulum absent. 



K. Vein Cu of both fore and hind wings apparently 

 fotar-branched. 



L. Small moths with slender bodies, and with the apex 

 of the fore wings sickle-shaped ; humeral veins absent, 

 p. 710 Drepanid^ 



