On the Evolution of Structure in Seedlings. 45 



27. ? Odontocera Dice., Newm. 

 :- Odontocera Dice, Ne'wm. Entom. p. 91. 

 Rio Janeiro. 



aaa. Hind legs short and stout ; femora thichly clavate. 



28. Odontocera triUturata^ Bates. 

 Oclotitocera triliturata. Bates, Trans. Ent. Soc. 1870, p. 324. 

 Iv. Amazons. 



29. Odontocera compressipes^ White. 



Odontocera coinpressipes, "WTiite, Cat. Long. Col. Brit. Mus. p. 191. 



R. Amazons. 



In this species the hind tibia are much dilated exteriorly 

 near the apex and tufted with hairs, evidently an adaptation — 

 the result, combined with colour and shape, being a close imi- 

 tation of a common yellow species of Melipona bee, 



30. Odontocera farciferay Bates. 

 Odontocera furdfera, Bates, Trans. Ent. Soc. 1870, p. 323. 

 R. Tapajos, Amazons. 



In this species the elytra are of the same form as in the 

 typical Acyphoderes, i. e. subulate and pointed at the apex. 



31. Odontocera simpleXyWhite. 

 Odontocera simplex, White, Cat. Long. Col. Brit. Mus. p. 825. 

 R. Amazons. 



32. Odontocera bisidcata, Bates. 

 Odontocera hisidcata. Bates, Trans. Ent. Soc. 1870, p. 326. 

 R. Tapajos, Amazons. 



[To be continued.] 



VI. — Growth or Evolution of Structure in Seedlings. 

 By John C. Draper, M.D.* 



HE continuous absorption of oxygen and formation of car- 

 )onic acid is an essential condition of evolution of structure, 

 )oth in plants and in animals. 



The above proposition, so far as it relates to animals, will 

 )robably be admitted by all ; the opposite opinion, however, is 

 From the * American Journal of Science and Arts,' vol. iv. November 



