PERIDROMIA. 271 
Hab. Mexico # ®, Oaxaca (Fenochio); British Honpuras, Rio Hondo (Blancaneauz) ; 
GuaATEMALA, San Gerénimo, Polochic valley (F. D. G. & O. S.*), Las Mercedes (Champion) ; 
Nicaracua, Chontales (elt); Panama, Chiriqui, Veraguas (Arcé).—CoLoMBIA ; VENE- 
ZUELA*?; Peru; Bouivia?; Gurana?2, 
Some confusion has existed regarding this species, owing to its close relationship to 
the South-Brazilian P. arete*, which, however, may be distinguished from it by the 
upper surface of the wings of the male being much more profusely and evenly spotted 
with blue. The female is not so easily recognized; but, as far as we can see from our 
own examples, the white cross-band of the primaries in P. arete is narrower and more 
distinctly cut by the veins, the portion nearest the anal angle being broken off into a spot. 
With the exception of South-eastern Brazil, P. arethusa is found throughout Tropical 
America. It was first described by Cramer from Surinam examples!. Mr. Bates found 
it at many places on the banks of the Amazons and its tributaries. In our region it 
occurs as far north as Mexico; in Guatemala it is found in the hot lowlands, and up to 
an elevation of about 3000 feet. 
b. Sexes nearly alike; underside of wings nearly black or black and red. 
2. Peridromia amphinome. 
Papilio amphinome, Linn. Syst. Nat. il. p. 779°; Cr. Pap. Ex. i. t. 54. ff. EH, F?. 
Ageronia amphinome, Bates, Journ. Ent. ii. p. 314°; Butl. & Druce, P. Z. 8. 1874, p. 347 *. 
Peridromia mexicana, Lucas, Rev. Zool. 1858, p. 311’. 
Alis nigris cyaneo variegatis, anticis ultra cellulam fascia sordide alba obliqua venis divisa notatis ; subtus nigris, 
fascia anticarum ut supra et maculis subapicalibus notatis ; anticarum basi et posticis pro majore parte 
coccineis venis nigris divisis, posticis ad apicem nigris punctis cyaneis notatis, margine externo quoque 
nigro, alis omnibus maculis marginalibus albidis notatis. 
@ mari haud dissimilis. 
Hab. Mextco®, Oaxaca (Fenochio), Cordova (fiimeli) ; Brrriso Honpuras, Rio Hondo 
(Blancaneaux); GuateMata®, central valleys and Pacific coast (fF. D. G. & 0. S.), 
Polochic valley (Hague), San Isidro (Champion); Nicaragua (Bridges), Chontales 
(Belt); Costa Rica (Van Patten*); Panama, Chiriqui and Veraguas (Arcé), David 
(Champion).—Soutn AMERICA generally to Bolivia and Brazil °. 
Lucas separated Mexican specimens of this insect under the name of Peridromia 
mexicana®, stating that the differences between them consisted in the band of the 
primaries in the northern form being straighter and more distinctly cut up by the veins 
and powdered with grey scales, and also in its having an extra spot in the apex of the 
primaries, and the wings being of a more rusty red. We have examined a large series 
of specimens closely, and though we notice the points alluded to by Lucas, they are by 
* Boisduval® complains that Doubleday gave his name P. arete to a different species from that to which he 
intended it to apply ; but as Boisduval’s name was only in MS., Doubleday’s assignment of it must hold good. 
