:^^OVITATES ZOOLOQICAE XXVI. 1919. 303 



Localities. Utinga, S. Joaquim, etc. 



I have only taken the larva on Aristolochia burchelli, once finding three 

 in the final instar on a small plant growing in an open sandy place, and on another 

 occasion one in the fourth instar in the Utinga matto. In this stage it is plain 

 maroon with very tall erect tubercles ; after moulting a much greater change 

 takes place in this species than with any others of the group, the ground-colour 

 becoming nearly black and each segment adorned with a broad vertical belt of pale 

 cadmium yellow, while the tubercles also are yellow. AVith its obvious alliance 

 to anchises and comparative distance from echemon, it is little short of extra- 

 ordinary that the larvae of these latter species should so closely resemble one 

 another, and that vertumnus should be so entirely different in outward design 

 and colour. 



Male butterfly characterised by a large and somewhat square patch of dull 

 glaucous green on the inner margin of the forewing ; and on the hindwing three 

 spots of unequal length in juxtaposition, forming a single patch of brilliant 

 crimson, and possessing a violet and greenish phosphorescence, when viewed 

 in certain lights. The spot nearest to the abdomen is the longest and most 

 curved. Abdominal sheath, a lovely white fur cloak, like the former species, 

 but not quite so large. 



Forewing of female contains a broad, irregular, but very clearly defined 

 patch of pure white in its centre, invading the cell. On the hindwing five spots 

 coalesce to form a broad and conspicuous patch of cherry-red, with one big spot, 

 and sometimes also a minute one of the same colour above. AU four wings in 

 both sexes are prominently marked with white in the fringes. 



P. anchises thelios (pi. ii. fig. 4, pi. iii. fig. 4). 



A very common species in Para, both sexes of the butterfly occurring at 



■ flowers in the open or more shaded parts of the matto. The larva is very 



frequently taken at apparently any time of year, feeding on Aristolochia 



longicaudata, btirchelli, and lanceolatolorata, a new species, for which it shows 



a special preference. 



As the larva is very variable, being sometimes of a washed-out ochreous 

 tint, adorned with a faint grey design, and at others of a warm Naples yellow, 

 heavily marked with black, grey, and maroon, the colour of its tubercles also 

 varying from a plain red in some specimens to the approved combination of 

 dark and light in others, it is as difficult to describe as it is to say wherein lies 

 its essential difference from echemon. Both are darkest at their two extremities 

 and lightest about the middle, sometimes suggesting the customary oblique 

 stripe on segment 8. This stripe, however, is, I believe, a more constant and 

 recognisable feature in echemon. 



Butterfly characters : Apex of forewing somewhat rounded, especially in 

 the female. Both sexes prominently adorned with white in the fringes of all 

 four wings, the female occasionally showing an admixture of pink scales with 

 the white in the lower part of the fringe of the forewing. Patch on forewing of 

 male glaucous green and triangular, with one or two cream-coloured spots in 

 its upper portion ; on hindwing five lovely crimson spots of variable and unequ; 1 

 length, which, like the former species, are opalescent, turning blue when viewed 

 sideways in the proper light. The female possesses a clearly defined, but not 



