ME. E. DEGEN ON ECDTSIS. 369 



early growth. This is particularly the case for the primaries, on both sides, which are 

 just issuing ; whilst cubital remiges III. have already attained about ^ of their 

 ultimate lengths. Being, however, developed quite symmetrically, the specimen was 

 better adapted for a concise diagrammatic representation of this stage than other and 

 later ones, which blend more or less with either the earlier stage of g or the later 

 one of I. 



DiAGR. F (supplementing stages g and h). (Plate XXXVII.) 



The specimen which supplies this diagram is No. 16. It is one showing the phases 

 of transition between g and h. This specimen repeats and completes the stage of g, 

 while that of h is developed in part. It therefore precedes for stage of development of 

 specimen No. 14, diagr. G, on the same Plate, although forming part of a complement 

 of specimens which were received at a later date. 



Diagr. H (illustrating stage i partially). (Plate XXXVII.) 



In specimen No. 17, which this diagram represents, we have an individual which 

 should mark the next phase in the moult of the primaries, namely that of metacarpo- 

 digital remex IX. or i if under normal conditions. But this individual being in arrear 

 of moult for the hand portions (metacarpo-digital remiges IX. being as yet undeveloped) 

 it merely shows this phase of renewal for their corresponding remiges IV. or i! on the 

 cubitus. It has been diagrammatized, nevertheless, for helping to complete the illus- 

 tration of this stage of development, which is one not very clearly accentuated in either 

 of the specimens which partake of it. For instance, Nos. 18 and 19 are considerably 

 in arrear of moult ; the latter, however, is distinguished by showing stage i partially on 

 the cubitus. No. 20 agrees with No. 19. 



"-&' 



Diagr. J (supplementing stage i). (Plate XXXVIII.) 



In specimen No. 21, which this diagram represents, we have a case in which the 

 conditions for stage i are reversed : since remex IX. is in full process of growth 

 in the hand portion of the left wing; whilst it has just issued on the right 

 wing, the side in which it is usually more in arrear than the other. The moult for 

 cubital remex IV. or ^', the corresponding one for that of the hand portion, has not 

 yet set in for the right side. This specimen, then, together with that shown in 

 Diagr. H (the former one), supplement each other in the completion of stage i and i! 

 respectively. 



No. 22, in arrear of moult, conforms to stage h, but is conspicuous as showing a case 

 of almost perfect bilateral symmetry. 



No. 23 is further in arrear, having reached stage g only. 



