326 RHOPALOCERA. 
lower discocellular runs nearly straight across the wing to a little beyond the origin of 
the second median branch. ‘The secondaries are closed by an atrophied nervure. The 
coxa of the front leg of the male is stout, >4 femur trochanter ; tibia nearly=femur ; 
tarsus slender, >+ tibia; terminal joint of the palpi long, =4 the middle joint. The 
secondary male organs have a tegumen with a single, slightly depressed central spine ; 
a single dependent spine hangs below this, which is doubtless formed by the two spines, 
usually found in allied genera, coalescing ; the harpagones are rounded at the extremity, 
the edge being much lacerated, and on the inner surface is a lobe also with a lacerated 
edge; on the middle of the ventral edge of the harpagones is a recurved hook. 
C. cadmus is the only species of the genus which has a very wide range in Tropical 
America. 
1. Coea cadmus. 
Papilio cadmus, Cr. Pap. Ex. t. 22. ff. A, B’. 
Aganisthos cadmus, Bates, Journ. Ent. ii. p. 8357. 
Papilio acheronta, Fabr. Syst. Ent. p. 501°. 
Megistanis acheronta, Butl. & Druce, P. Z. 8. 1874, p. 341°. 
Papilio pherecydes, Cr. Pap. Ex. t. 330. ff. A, B’. 
Alis fuscis, anticarum apicibus late nigris et albo punctatis, litura a basi marginem externum versus extendente 
rufo-fulva; subtus sericeo-fuscis lineis variis undulatis, nigro preecipue in dimidio basali notatis, maculis 
albis ad costam anticarum et ad basin posticarum ornatis; margine externo albido atomatis; posticis 
spatulatis. 
Hab. Mexico, Cordova (Riimeli); Guatemaua, San Gerénimo, Polochic valley (Hague), 
central valleys (F. D. G. & O. S.); Nicaracua, Chontales (Belt, Janson); Costa Rica 
(Van Patten*); Panama, Bugaba (Champion), Chiriqui, Veraguas (Arcé).—CoLomBia to 
SoutH Brazit; Hartt. 
Described and figured by Cramer under this name, and redescribed and figured later 
in the same work as A. pherecydes. Like the last it is an exceedingly common and 
widely ranging species. The upperside is pretty constant in its markings, but the 
underside shows considerable variation, and it was probably from this cause that 
Cramer was led to consider A. pherecydes distinct from A. cadmus. 
The name Papilio acheronta was given it by Fabricius the same year as Cramer’s 
A. cadmus. The former has been employed by Kirby and others; but Cramer’s name, 
accompanied, as it is, by a figure, seems to us the best to use. 
MEGISTANIS. 
Megistanis, Westwood, Gen. Diurn. Lep. p. 311 (1850, ex Boisduval, MS.). 
Prof. Westwood first characterized this genus, adopting a name of Boisduval’s. The 
typical species is no doubt Papilio cadmus of Cramer, as Megistanis bwotus, which is 
