Mimetic Relationships in the genus Heliconius. 113 



band is less indented, has been named burchelli by Poulton. 

 H nanna resembles closely, on the upperside at least, 

 H. besckei. The clasper as shown on PL XVI is no more 

 distinctive than the others already considered. 



H. besckei, Menetr. 



This species, occurring in S. Brazil, resembles nanna and 

 erato <phyllis. It is distinguished outwardly by a reddish 

 submarginal line on the underside of the hind-wing. 

 Kaye has expressed the view that it is a form of H. erato 

 phyllis, but the structure of the armature precludes this 

 possibility. A clasper is shown on PL XVI, and the 

 principal" feature in which it differs from the cydno and 

 melvomene forms is the presence of a dense tuft of bristles 

 near the point. If this be a good character, as has been 

 supposed, in dividing the Silvaniformes, then we have 

 grounds for separating the species, and the pecuhanty ot 

 the hind-wing pattern supports this view. 



We thus see that in so far as may be judged from the 

 genitalia there is no reason to suppose that the forms now 

 included under the Cydnoformes and Melpomeneformes, 

 with the exception of H. besckei, really constitute more 

 than one species. The extent to which pattern and other 

 features support such a conclusion will be discussed in a 

 later portion of this paper. 



Section II. 



In this section the structure of the armature provides 

 much more satisfactory evidence of specific distinctions 

 and to a considerable extent confirms the reputed species 

 into which the forms have been divided. Taking these 

 in the order adopted in Stichel and Riffarths work, 

 we find seven reputed species included in group 1, the 



Hecalesiformks. 



H. crispus, Stgr. 



This species resembles atthis, but is modified so as to 

 mimic Tithorca bonplandii deacandolksi. It occurs in the 

 Cauca valley. 1 have had no specimen to examine 



TB W-. ENT. SOC. LOND. 1910.— PART I. (AUG.) I 



