Hinckley.] 90 [October 4, 



through this, the action of the gills which have developed within 

 may be seen. Among tadpoles of this species and R. halecina, 

 I have met with several having a like aperture on the right side 

 also. Black fringe at edge of upper lip and of the three folds of 

 under lip beginning to appear. Eyes developed, so as to serve 

 their purpose apparently. 



April 19. Golden dotting on head and body increasing. Length 

 of tadpoles about 13 millim., gained chiefly by the development 

 of the caudal portion of the body. 



April 23. Holders entirely resorbed and tadpoles moving more 

 widely. Head is more pointed than that of R. halecina, R. pal- 

 ustris, R. fontinalis, or R. catesbeiana. Length of head and body 

 contained twice in the length of the tail. Black coloring spread- 

 ing over under surfaces. Tadpoles look as if held in a transpar- 

 ent membrane. 



April 25. Under lip shows three fringed folds, and beneath 

 upper lij:), one each side the upper jaw. 



May 1. Tadpoles have abandoned their birth place and are 

 found everywhere about the pond, generally occupied in seeking 

 food. 



May 2. Tadpoles collected about, and gnawing on strings of 

 eggs of Bufo americanus brought to the pond last night. 



May 3. A prismatic hue on abdomen, and a bluish sheen on 

 upper surface of body. Golden dotting brilliant. Tadpoles ap- 

 pear dark olive-green under water. 



May 6. Legs have appeared as small white buds in front of 

 the base of the tail Mear the lower edge on each side. Fourth 

 fringed fold on under lip and second fringed fold beneath upper 

 lip each side the upper jaw, developing. Golden dotting has be- 

 come confluent through the middle portion of the abdomen. The 

 eye has a transverse suture in its lower semi-circle, which branches 

 and appears to form or be connected with, the more or less de- 

 fined ring within the iris. 1 The golden line immediately bounding 

 the pupil fails to meet midway its lower half. 



May 8. Observed to-day the glandulous lines, 2 like a hair line 



1 See Goette. Der Unke, p. 323. 



2 Cornalia. " Sull Pelobates fuscus et sulla Rana agilis trovati in Lombardia," Atti. 

 Soc. Ital. Sc. Nat., Vol. xvi, p. 96, pi. 3, 1873. 



Lessona. Studii sugli Anfibi anuri del Piemonte, in Reale Ace. dei Lincei, S. 3, 

 Vol. i, p. 26, 1877. 



M. Heron Royer. Le tetard de la grenouille agile, et note ponr reconnaitre celui du 

 pelodyte ponctue"; Bull. Soc. Zool. de France, p. 132, 1878. 



