MEGISTANIS, 327 
figured by Hewitson and associated with P. cadmus, is spoken of as aberrant. By 
using Megistanis for M. beotus and its strict congeners, and applying Hiibner’s name 
Coea to P. cadmus we avoid some difficulty and confusion which would be caused by 
shifting titles from one species to another. At the same time we are aware that some 
lepidopterists would retain Megistanis for Papilio cadmus, and place M. bewotus under 
a new name, or perhaps Eribea, Hiibner. Others might go still further, and sink 
Megistanis altogether as a synonym of Coea! . 
Megistanis, as here understood, contains two or three species, M. beotus and 
M. ducalion, both of which have a nearly conterminous range, extending from the 
valley of the Amazons westward to Peru and Colombia, and in the case of M. beotus 
to Bolivia and Nicaragua; the third species is 1. wclus, Cramer, of which we have no 
recent information. Its habitat was stated to be Amboina!, and it has been supposed 
to be a variety of MW. beotus. 
M. beotus has the primaries moderately produced at the apex, and the outer margin 
but slightly concave ; the subcostal nervure emits two branches before the end of the 
cell, the third branch lies close to the subcostal for some distance before diverging to 
the margin; the upper discocellular is short, and the middle also, and there is an 
atrophied lower discocellular running straight across the wing to a little beyond the 
origin of the second median branch; a similar nervure closes the cell of the secondaries. 
The coxa of the front legs of the male are rather stout, =} femur+trochanter; tibia 
<femur; tarsus single-jointed, =} tibia. The terminal joint of the palpi is long, 
= about 4 the middle joint, which is slightly swollen towards the distal end. The 
antenne have 57 joints, the club being slender. The male secondary organs have a 
tegumen with a blunt central point, and the depending pieces apparently uniting in a 
strong outwardly directed spine; the harpagones terminate in a hairy lobe, and have 
two strong diverging spines, starting before the end, and directed outwards and slightly 
upwards. Aganisthos orion has one such spine ; in Coea cadmus none exist. 
1. Megistanis bzotus. 
Megistanis beotus, Doubl. & Hew. Gen. Diurn. Lep. t. 48. f.2*; Bates, Journ. Ent. ii. p. 3897. 
Alis nigris, fascia communi lata a vena anticarum mediana fere ad angulum posticarum analem extensa nitide 
cerulea; anticis maculis duabus, una ad coste medium, altera ultra cellulam ejusdem coloris, maculis 
quoque duabus submarginalibus albidis; subtus argenteo-albis undique nigro maculatis, anticis et posticis 
macula inter ramos medianos lutea, illa in posticis ocellata; posticarum margine externo valde dentato, 
vena mediana in caudam producta. 
@ adhuc ignota. 
Tlab. Nicaragua, Chontales (Janson).—CoLomBia! ; Ecuapor; Psru; Bottivia; 
AMAZONS ?. 
We have a single specimen of this fine species, obtained by Janson at Chontales in 
