( xlviii ) 



of the " Melpomeneformes " and " Cydnoformes," with the 

 possible exception of H. pachinus, were forms of one species, 

 whereas forms of Section II of the genus seemed to be 

 their models, and certainly belonged to several different 

 species, thus recalling the mimicry of several species of 

 Planema by forms of one species of Psetidacraea. He explained 

 that the subject was rather complicated, and it was impossible 

 to do justice to it in the short time available that evening, 

 but the various aspects of the matter were dealt with at 

 length in the complete paper which he hoped would shortly 

 be published. 



In connection with this exhibit Mr. W. J. Kaye showed four 

 large cabinet drawers of Heliconius species, three of which 

 contained what might ultimately be proved to be forms of 

 the extraordinarily variable species melpomene. Such were 

 amaryllis, nanna, aphrodite, amandus, lieurippa, xenoclea, 

 plesseni, niepelti, rubripicta, besides a number of other forms 

 from Para, such as thelxiope graduating into aglaope; while 

 a series of aglaope from East Peru was more or less con- 

 stant. A fourth drawer contained a very large number of 

 what were probably all forms of erato, which might be looked 

 upon as the companion species of melpomene, for forms of the 

 one were invariably accompanied by forms of the other. 

 The forms included microclea, notabilis, feyeri, ochracea, etylus, 

 oberthuri erythraea, udalrica, callycopis, hydara, and a com- 

 pletely intergraded series from East Bolivia of forms from 

 venustus to sanguineus, anactorie, phyllidis, amaius, and a single 

 red blotched form very similar to melpomene, and practically 

 only distinguishable by the secondary sexual character on the 

 underside of the forewing. 



Scent-scales and genitalia in forms of Pieris napi, 

 Linn. — Dr. F. A. Dixey showed upon the screen outline 

 drawings of scent-scales and genitalia from various forms of 

 P. napi, Linn. ; remarking on them as follows : — 



" Some little time since, I was asked by Mr. C. B. Williams 

 to examine the scent-scales of males which had been bred 

 from eggs laid by a female bryoniae, in order to see whether 

 they would show any recognisable difference from those of 

 the ordinary form of napi. The scent-scale of napi, though 



