a collection of Heliconine forms from French Guiana. 421 



of hind-wing. This form is most likely a later development 

 to the thelxiope full streaking, the red basal area of fore- 

 and hind-wing being suppressed. This is a likely explana- 

 tion, as it is to be seen that in this, as in all streaked 

 forms, on the underside the flame-pattern is very greatly 

 reduced ; this also lending support to the theory advanced 

 already, that the long slender streaks are a subsequent 

 development to the wide streaks. But material from East 

 Ecuador is not plentiful enough in collections to at present 

 decide, and a large collection, such as we have examined 

 from Cayenne, is much to be desired. 



A quite different phase of variation of the hind-wing is 

 a change from a red band to a yellow band. This is a 

 very rare form of variation in French Guiana, and only 

 three specimens show this transition. One has the red 

 transverse band just tipped with suffused yellowish at the 

 apex. The second specimen is nearly half red and half 

 yellow, the outer yellowish half being suffused with blackish, 

 while the inner red half shows a trace of yellow. The last 

 specimen has a wholly yellow band, but still suffused with 

 some dark scaling about the middle. At the base the band 

 is completely obliterated with the ground-colour. 



SUMMARY OF FORMS TOWARDS A RED HIND-WING BASAL 

 STREAK. 



Single red ^ggST \ Short basal 

 spot. ftrea streak. 



Longer streak 



suffused Entire streak, 

 outwardly. I 



75 



64 271 



420 



Section C (forms with basal streak and flame streaks). — 

 The next stage of development from the red basal streak 

 is the appearance of either long, very narrow streaks, or 

 of a row of suffused spots. It is possible that the very 

 narrow, almost linear streaking, is a subsequent phase to 

 the full nail-headed streaking. It is clear that development 

 from a row of spots is the more usual, but perhaps not the 

 only method. Specimens show every gradation, from a 

 faint indication of spots to larger and better-defined spots, 

 then to short tapering streaks, and finally to the full-length 

 streaking as is seen in thelxiope. 



