188 Mr. J. C. Moulton on the llhopalocera 



two species are on the wing together ; for he gives 10 

 specimens of H. clyiemnestra caught March 7th, 1826, at 

 Catoniby, and one of G. dirce on the very same day. Five 

 of the clytemnestra have unfortunately since been lost, as 

 well as this single dirce. 



The pattern, which consists of a dark fuscous background 

 enlivened only by a broad yellow bar across the apex of the 

 fore wing, stands out in each case from that which is found 

 in the allied species. It is difficult, and perhaps impossible, 

 to determine which of the two forms has acted as model ; 

 but in the case of H. clytemnestra, the species of the closely 

 related genus Protogonius are invariably, although roughly, 

 mimetic. Thus Protogonius drur'ii mimics Heliconius narcoid. 

 Hence it becomes probable that this propensity for mimicry 

 is extended to H. clytemnestra. Burchell's specimens of 

 clytemnestra without exception exhibit three yellow spots just 

 beyond the subapical band of the fore wing ; and tliese are 

 absent in dirce. However, on comparing a series of each in 

 the Hope Collection from Paraguay, I observed that the spots 

 were in some cases reduced in clytemnestra and corre- 

 spondingly present in dirce, as if the mimetic association 

 was stronger in that part of the country. 



It must be further noted that this is only a case of upper- 

 side mimicry. The underside of clytemnestra is procrypti- 

 cally coloured, apparently for concealment among dead 

 leaves, while the bolder pattern of G. dirce is adapted for the 

 protective resemblance to tree-trunks on which it rests with 

 upright wings (H. W. Bates in Lepidoptera Rhopalocera 

 of the 'Biologia Centrali-Americana,' F. D. Godman, F.R.S., 

 and O. Salvin, F.R.S., vol. i. pp. 264-266). 



Catagramma lyrophila, Hiibn. 



Bz. 286. I. [13. 10. 25]. =727. MinasGeraes. Paraliibn. 



''''Papill^io] afiBnis prajcedenti/' viz. Callicore clymena, 



Cram. 

 Bz.+ 912. I. 25. 10. 25. = 728. Minas Geraes. "P[a/>- 



iho]. At Discoberto, near Joao Pedro's liouse." 

 12. 2. 26. = 729. Organ Mountains. 



A date given as 12. 26 (omitting the month) in West- 

 wood's list has probably been accidentally substituted for 

 that of 729. 



25. 8. 27. = 730. Olhuia to Rio Pardo. 



26. 8. 27. = 731. R. Pardo to Cubatao. (See 515.) 



" Lepido{)tx^ra caught on the riverside at the ferry of the 



