NEW SPECIES OF GU.ANA AND JAMAICAN BUTTERFLIES. 51 



this race we know very little, especially as to how the inter- 

 mediate forms fit in. In Peru the form called dilJ'asus shows 

 the yellow band partly obliterated by the ground colour in the 

 lower half, and frequently the apical spots are entirely sup- 

 pressed. From this form there is a gradation in aberration 

 where the yellow is entirely suppressed, where the colours have 

 become black and fulvous only, but where the hind wing has 

 retained the usual coloration. This form is probably unnamed, 

 but is probably only an aberration of difusus. Lastly, as an 

 extreme in one direction, there is the form semifidvus, in which 

 the hind wing is greatly blackened as far as vein 6. Specimens 

 of this are found, showing a transition of the orange band to 

 the yellow band, as found in difusus. Going southwards, no 

 great change is found from the less extreme Guiana forms till 

 one comes to Southern Brazil, where the chief distinction lies 

 in the presence of a longer white apical patch instead of two or 

 three yellow patches. The shape of the yellow band remains 

 much the same as in the Guiana form, in fact almost identical 

 with that of the Berbice specimen. The colouring of the hind 

 wing varies greatly, from fulvous to a shade of lemon-colour, to 

 yellow with a shade of fulvous. It may possibly be due to vary- 

 ing altitudes in some localities where two forms have been 

 received from the same country, as they have been from Colom- 

 bia and Ecuador, Accurate data are much needed to decide, 

 but there is scarcely a doubt that continuity of forms prevails 

 to a very large extent. 



Papilio cahuri, n. sp. (PL II. fig. 1). 



Fore wing deep lustrous ivy-greeu, the basal half much darker and 

 less lustrous. Hind wing lighter green than fore whig, and with a 

 greater sheen on the costa ; reaching to nervure 7 is an oblong patch 

 of cream-coloured scales, and between nervures 6, 7 is just an indica- 

 tion of another patch ; before the margin is a row of larger black 

 blotches around the nervures extending to vein 6, where the blotches 

 have become much reduced. Outer margin deeply crenulate, with 

 sharp triangular tooth-like black marks running up between the 

 nervures. Abdomen of the same colour above as hmd wing ; the sides 

 with three rows of orange patches. On the under side of fore wing 

 ground colour dull blackish ; basal half much darker, with a small 

 elongated patch of cream-coloured scales within the cell, lying near 

 lower discocellular. Under side of hind wing blackish, with a 

 marginal row of cream-coloured spots between the nervures, pre- 

 ceded by a row of brick-red heart-shaped blotches. On under side of 

 abdomen is a double row of cream-coloured white dots. Expanse 

 150 mm. 



Hah. Forest between Essequibo and Mazaruni Rivers, near 

 Bartica (W. J, Kaye, April 16th, 1901), 



f2 



