of the Amazon Valley. 239 



5. C. Eitbule, Linn. 



5. P. Euhule, Linn.; Cram. 120 e. f. 

 c? . P. 3Iarcellina, Cram. 163 c. 



It seems to be uncertain whether the description of Linnaeus 

 belongs to this species or to the nearly allied North American form. 

 In a doubt of this kind we have no remedy but to be guided by the 

 next subsequent author, who by a better description or figure fixes 

 the name. Cramer's figure undoubtedly applies to the South American 

 species. It is extremely abundant. 



6. G. Statira, Cram. 



2. P. Statira, Cram. 120 c. d. (1779). 

 c? $ . C. Evadne, Boisd. Sp. Gen. 628. 22 (1836). 



The $ varies extremely in size and colour, viz. from 1" 8'" to 2'' 8'" 

 in expanse, and from pallid white to a rich clear orange-yellow. 

 Throughout all the variations the shape of the black border remains 

 constant ; it may also be known by the great length of the terminal 

 joint of the palpi. The S also varies considerably in the breadth of 

 the pale powdery margins of the wings, and in the depth of the basal 

 yellow colour. It is the most abundant species of the genus. The 

 females are confined to the thinned parts of the forest and its margins, 

 where they may be seen depositing their ova on low trees of species 

 of Mimosa. The males congregate by myriads, in company with an 

 almost equal number of Euhule and a few of all the other species of 

 the genus, on the moist sands or mud on the banks of rivers. In 

 the height of the dry season (October) very extensive migrations 

 take place. I once travelled with a fair wind on the Lower Amazons 

 about eighty miles between sunrise and sunset, and during the whole 

 of the journey the air teemed with these butterflies, all crossing the 

 river, there from three to five miles broad in one direction, viz. from 

 north to south. On the Upper Amazons they settle on the moist 

 sands in dense masses of many yards square, all with wings upright 

 and closely packed together. 



7. C. Trite, Linn. 

 P. Trite, Linn. ; Cram. 141 C. D. 

 Generally distributed throughout the Amazon region. 



Note. — It is worthy of remark, in connexion mth the fact of the 

 strong, sustained flight and migratory instincts of the species of this 

 genus, that it is found throughout the tropical and subtropical zones 

 of the whole world, and that the species of the two hemispheres 



VOL. I. T 



