284 LEPIDOPTERA OF NORTH AMERICA. 



minent. Antennas ^ith bases approached, much shorter than the 

 body, rather deeply pectinated in the ^ , less pectinated in the ?. 

 Palpi very minute, filiform, drooping, with only two distinct joints; 

 terminal joint acute. Tongue about as long as the thorax beneath. 

 Body extremely slender, cylindrical, not metallic. Patagia 

 cylindrical, minute. Abdomen without lateral tubercle, tufted at 

 the tip and along the sides. Legs extremely slender ; fore tibiae 

 without tibial spur ; hind tibiae with two very minute apical spurs. 



1. A. americana Boisd. Griff. An. Kingd. Lep. Procris americana Boisd., 



S. Gr. Lep. I, pi. 16, f. 7 ; Guer. Icon. Reg. An. Ins., pi. 84, bis, f. 11. 

 Procris dispar Har., Cat. P. americana Har., Cat. N. A. Sphin., p. 

 35. Ctenucha americana Walker, 286. 



Blue-black. Prothorax above entirely fulvous or orange. 

 Massachusetts, New York, Pennsylvania, Georgia. 



Subcostal vein exterior to the disk, trifid ; apical branch with a 

 long fork. 



2. A. coracina Clemens. 



The specimens are imperfect and denuded. The entire insect is 

 black, without the orange-colored prothorax of Americana. 



Texas. Capt. Pope's collection. From Smithsonian Institution. 



CTENUCHA KIRBY. 



Wings broad, or narrow, elongate-trigonate. Fore wings with 

 the subcostal vein giving rise near the posterior end of the disk to 

 a single marginal nervule, and another exterior to the disk and 

 nearer to it than to the post-apical nervule, which is given off near 

 the apical nervulet. The subcosto-inferior nervule and discal 

 branch from a common stalk, the latter straight and the discal 

 fold received by the medio-superior nervule. The median vein 

 4-branched, the posterior much behind the marginal branch, and 

 rather remote from the penultimate. Hind wings without costal 

 vein ; subcostal bifid, with the discal given off from the fork and 

 receiving the discal fold at its angle. Median vein 4-branched, 



