Phylctic Parallelism in Mctamorphic Species. 493 



tion and transformation of these parts takes place, 

 so that finally the four head segments appear as a 

 single small ring formed from the coalesced pairs 

 of maxilla,*, whilst the so-called " fore-head " (the 

 first head segment), together with the mandibles, 

 becomes transformed into a suctorial-head armed 

 with hooks and lying within the body. At the 

 time of writing I drew no conclusion from these 

 facts with reference to the phyletic development 

 of these larval forms ; nor did Biitschli, six years 

 later, in the precisely analogous case of the larvae 

 of the bees. The inference is, however, so ob- 

 vious that it is astonishing that it should not 

 have been drawn till the present time. 



There can be no doubt that the maggot-like 

 larvae of insects are not by any means ancient 

 forms, but are, on the contrary, quite recent, as 

 first pointed out by Fritz M filler, 10 and afterwards 

 by Packard 11 and Brauer,' 2 and as is maintained in 

 the latest work by Paul Mayer 13 on the phytogeny 

 of insects. 



Lubbock concludes from the presence of thoracic legs in 

 the embryonic larva of bees that these have been derived 

 from a larva of the Campodea type, but he overlooks the 

 fact that the rudiments of the abdominal legs are also present ; 

 he. tit., p. 28. 



10 " Fur Darwin," Leipzig, 1864, p. 8. 



" Mem. Pea body Acad. of Science, vol. i. No. 3. 



'* Verhandl. Wien. Zoolog. Botan. Gesellsch. 1869, p. 

 310. 



" Uber Ontogenie und Phylogenie der Insekten. Eine 

 ukadcinischc I'rciss( hrift. |c-n Xcits< hrilt. 1U1. \. Ncue Folge, 



