a collection of Heliconine forms from French Guiana. 429 



Tabulated the forms compared show fore-wing darkening 

 as follows — 



With the hind-wing the preponderance of dark (all 

 black) forms is still greater with melpomene. In erato 

 there are only six such forms, while in melpomene there are 

 no less than 125 forms. Tabulated they appear thus— 



As is well known, erato never shows a short red basal 

 hind-wing streak, but in Cayenne the streaking is very 

 persistent, and it is interesting to compare the numbers 

 and percentages with " thelxiope " streaked melpomene. 



It is thus seen that with a streaked hind-wing the 

 influence exerted by erato is very great, and instead of 

 melpomene acting as model it is very decidedly in this 

 respect the mimic. Erato is even reinforced with sundry 

 other species of Group II Heliconines, such as H. xanthocles 

 vala (6), H. egeria egeria (5), H. doris (6), H. aoede aoede 

 (1), all of which have a streaked hind-wing. 



* cybele hind-wing ) in all cases no suffused particoloured 

 f thelxiope hind-wing J forms included. 



