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XVI. Notes on a large Heliconine collection made in French 

 Guiana in L917, compared with a similar collection 

 made in 1915. By J. J. Joicey, F.E.S., and W. J. 

 Kaye, F.E.S. 



[Read November 6th, 1918.] 



With Sketch Map. 



Perhaps the most striking and interesting point about 

 this great collection is that the percentages both as to 

 the various forms under melpomene and under erato, and 

 also the ratios of the one species to the other, are found 

 to be in substance the same as those worked out in our 

 previous paper (Trans. Ent. Soc. 1917, pp. 412-431), thus 

 giving confirmation to our published figures. The present 

 collection is four times as large as the one made in 1915, 

 and when slight discrepancies occur in percentages prob- 

 ably the present figures are more correct. Thus in 1915 

 the number of black hind-winged melpomene was 125 out 

 of 731, or 17' 53 %, but in the present collection there are 

 only 302 out of 2,935, or 10*29 %, and we think it highly 

 probable that the latter figure is more correct. The red 

 basal streaked section is near enough (54' 32 % against 

 57' 03 %) to practically prove that it preponderates over 

 the other two sections combined, while it follows that 

 what the black hind-winged section lost the fully streaked 

 or " thelxiope " hind-wing gained, so that in the present 

 collection the fully-streaked section have 35' 39 % instead 

 of 25'44 % in 1915. 



The number of //. melpomene secured is the very large 

 total of 2,935. They are divided amongst the three 

 sections as follows : — 



TRANS. ENT. SOC. LOND. 1918. — PARTS III, IV. (MAR, '19; 



