NORTH AMERICAN LEPIDOPTERA. 135 



in front of jiriniaries. Abdomen very long, tapering gradnally to a 

 point, the segments armed posteriorly with spinnles ; vestiture very 

 smooth, a narrow brush of fine hair at tip in the Z . Tibiae not 

 spinose ; median pair with unequal terminal spurs, posterior with 

 terminal and middle spurs. Legs lengthening posteriorly, the hind 

 legs nuich the longest and stoutest. Primaries narrow, proportion- 

 ately small, apex acute, subfalcate, outer margin very oblique, inner 

 margin sinuate; 12-veined, the venation presenting no peculiarity. 

 Secondaries small and narrow, venation as usual, outer margin 

 sharply produced on vein lb, else even, apex pointed. The genitalia 

 are very much as in Darapsa ; there is no essential difference in the 

 supra-anal plate and hook ; the side piece is rather broad, a small, 

 weak, slightly curved hook inferiorly near base. 



This genus differs from all others of our American forms in the 

 long, slender abdomen, and the comparatively short, narrow wings, 

 the primaries subfalcate. 



Two species ai-e in our lists as North American ; the common C. 

 tersa of the East, and C. procne Clem., from Lower California. This 

 latter species has never since been found in our territory. ]Mr. Hy. 

 Edwards states that he never saw or heard of it in California. Butler 

 says he thinks it an African form with an erroneous locality. Strecker 

 figures a sjiecies which he says agrees with Clemens' description and 

 which ]iiay have been Clemens' type, but he has no definite informa- 

 tion in regard to its locality. Mr. Grote suggests that it may be C. 

 /ucasil from East India, and Mr. Maassen makes the reference posi- 

 tively. For the benefit of those desiring to investigate, I add the 

 bibliography. 



The only species really belonging to our fauna is tersa, and the 



genus is essentially a tropical one. 



C tersa Liuu., Mant. lus. ii, 538, Sphinx : Dru., Ex. i, 61, pi. 28, fig. 3, Sphinx ; 

 Westw., ed. i, 56, jil. 28, fig. 3, Deilephila ; Fabr., Syst. Eut. 547, Sphinx ; 

 Sp. Ins. ii, 153, Sphinx ; Maiit., Ins. 2, 98, Sphinx : Ent. Syst. iii, 1, 378, 

 Sphinx; A. & S.» Ins. Ga. i. 75, pi. 38, Sphinx; Cram., Ex. iv, 226, pi. 397, 

 fig. C, Sphinx ; Gmel., ed. Linn. S. N. 2379, Sphinx ; Hiib., Verz. 135, Ther- 

 etra ; Harr.,* Sill. Journ. 36, 303, Chcerocampa ; Duncan,® Nat. Libr. 37, pi. 

 V, fig. 1, and pi. vi, fig. 1, Metopsilus ; Wlk., C. B. M. Lep. Het. viii, 131, 

 Chcerocampa ; Burm., Sph. Braz. 61, Philampelus ; Lucas in Sagra (Juba, 1856, 

 293, Chcerocampa ; Clem.,-'- Journ. Ac. N. Sci. Phil, iv, 150, Chwrocampu ; Morr., 

 Syn. 1862, 171, Chcerocampa; H. S. Corr. Bl. 18, p. 58, Chcerocampa; Grt., 

 Buft: Bull, i, 22, iletopsilns; Bd.,« Sp. Gen. Het. i, 268, Chcerocampa; Butl., 

 Tr. Zool. Soc. Lond. ix, 563, Chcerocampa; Feruald,---"Sphing. 62, Chwrocampa ; 

 Guudlach, Cont. Ent. Cuba 191, Chcerocampa : Grt., Hawk Moths 30, Dei- 

 lonche; Edw., Ent. Amer. 3, 165, Chcerocampa. 



