^significance as indicating the ancestral occurrence of a thoracic 

 horn in both sexes. In what is probably the most ancient 

 group of that immense genus (0. tarandus, ¥., and allied 

 species) male and female have an identical armature. 



I believe an armature to have been primitively common 

 to Lamellicornia of both sexes; that it j^robably had some 

 relation to the insects' habits, which there is reason to suppose 

 were elaborate in the ancestral forms; that there has been 

 a general tendency for the females to lose the armature, 

 perhaps in correspondence with a division of labour between 

 the sexes ; and that the armature has developed fantastically 

 in males which have ceased to collaborate with the females, 

 and as a consequence of their diminished importance to the 

 preservation of the species. 



New or rare Rhopalocera collected in Central 

 Ceram by Messrs. F. C. and J. Pratt, at elevations 

 PROM 2500 TO 6000 feet, in October and November 1919. 

 —Mr. G. Talbot exhibited the following species on behalf 

 of Mr. J. J. Joicey : — 



Troides procus Roths. (1914), o and ?. The ,^ is a new 

 discovery, and indicates that procus, although allied to the 

 goliafh group from New Guinea, is a distinct species, and 

 was so considered by Rothschild. The cell of the hind- 

 wing is differently shaped. This species may rank with 

 alexandrae as the largest Troides at present known. Only 

 taken at 2500 ft. 



T. supremus Rob. ^ $ shown for comparison. 

 Papilio weishei stresemanni Roths. (1915), S and $. The ? 

 was not obtained by Rothschild's collector. Taken at 6000 ft. 

 Delias sp. nov., (^ $. The only species known in which 

 the $ bears a red band on the fore-wing above. This species 

 is allied on the one hand to dohertyi Roths, from Jobi and 

 Biak Islands, and on the other to iiegriiia Fbr. from Queens- 

 land. Taken at 6000 ft. 



Delias stresemanni Roths. (1915), o $. The ? $ show 

 variation on the underside. 



Delias echnida Hew., o ?• This very rare species has 

 apparently not been recorded since taken by Dr. A. R. 

 Wallace. The ? is undescribed, and a specimen exists in 



