36 Frogs of the Okefinokee Swamp 



aa. Egg mass submerged. 



b. Eggs in files or bands. 



c. Eggs laid in bands which soon become loose cylinders extending along 

 plant stems or grass blades; vitellus 1.4 to 2.0 mm; envelope 3.8 to 5.6 mm. 

 Egg complement, 2,332. Season, April 15 or earlier to August 17 (Fig. 

 5) Scaphiopus holbrookii. 



cc. Eggs in files. 



d. Files short (4 to 10 mm in length); 4 to 8 eggs in short bead-like chain 

 or bar or many such files radiating from one focus; vitellus 0.8 to i.o 

 mm; tube diameter 1.2 to 1.4 mm. Egg complement, 610, 766. 



Season, June 4 to August 21 (Fig. 4) Bufo quercicus. 



dd. Files long (several feet in length or often a meter or more long); 

 vitellus 1.0 to 1.4 mm; tube diameter 2.6 to 4.6 mm. 

 e. Inner tube absent; outer tube 2.8 to 3.4 mm; vitelli crowded in 

 the files; at first in a double row, later more spread out but still 

 crowded; 22 to 24 eggs in 30 mm (i 3/16 inches). Egg comple- 

 ment, 7,750. Season, April 15 or earlier to August 17 (Fig. 



3) Bufo foivleri. 



ee. Inner tube present. 



f. 18 to 20 eggs in 30 mm (i 3/16 inches); partition apparent 

 between eggs; inner tube 1.6 to 2.2 mm; outer tube 3.4 to 

 4.0 mm. Egg complement, 4,000 to 8,000. Season, April 5 



to July 25 (Fig. i) Bufo americanus. 



ff. 7 to 8 eggs in 30 mm (i 3/16 inches); distinct space between 

 eggs; no partition apparent; tube inclined to be slightly 

 emarginate between the eggs; inner tube, 2.2 to 3.4 mm; outer 

 tube, 2.6 to 4.6 mm. Egg complement, 2,888. Season, April 



15 or earlier to August 13 (Fig. 2) Bufo terrestris. 



bb. Eggs|in|lumps. 



c. Egg mass a firm regular cluster. 



d. Egg mass a sphere 2^ to 4 in. (6.35 to 10 cm) in diameter, containing 

 2,000 to 3,000 eggs; outer envelope distinct.) 



e. Eggs black above and white below; inner envelope apparently 

 absent, slightly evident under lens, 3.6 to 5.8 mm; outer envelope 

 5.2 to 9.4 mm; vitellus 1.8 to 2.4 mm. Egg complement, 2,000 

 to 3,000. Season, March 19 to May i (Fig. 23). . . . Raiia sylvatica. 

 ee. Eggs brown above and yellow below; inner envelope distinct 2.3 

 to 3.0 mm; outer envelope 3.6 to 5.0 mm; vitellus 1.6 to 1.9 mm. 

 Egg complement, 2,000 to 3,000. Season, April 6 to May 18 



(Fig. 19) Rana palustris. 



dd. Egg mass a plinth. 



e. Without inner envelope, complement small, 349 to 474; eggs black 

 above and sulphur or primrose yellow below; eggs further apart 

 than in R. pipiens or R. spheiiocephala; outer envelope 4.9 to 6.9 

 mm; vitellus 1.5 to 1.8 mm. Egg complement, 349 to 474. 



Season, June 21 to August 1 1 (Fig. 14) Rana virgatipes. 



ee. With inner envelope, complement large, 1,000 to 5,000 or more; 

 eggs black above and white below. 



f. Vitellus average 2.0 mm (range 1.8 to 2.4 mm); inner envelope 

 3.1 to 4.4 mm; outer envelope 4.4 to 6.0 mm, mode 5.2 mm, 

 av. 5.3 mm. Egg complement, 5,000 or more. Season, (?) 



to August 17 (Fig. 22) Rana ae.^opus. 



ff. Vitellus average 1.4-1.7 mm (range 1.3 to 2.0 mm); inner 

 envelope 2.3 to 3.2 mm; outer envelope 3.4 to 6.6 mm. Egg 

 complement, 1,000 to 5,000. 

 (g. Average outer envelope 5.0 or larger. 



(h. Average outer envelope 5.1 mm. (range 4.2 to 6.0 

 mm, mode 5.0 mm.); vitellus 1.7 mm. average (1.4 

 mm-2.o mm). Egg complement, 3,500 to 4,500. 

 Season, March 30 to May 15 (Fig. 20) Raiia jripiens. 

 (hh. Average outer envelope 6.3 mm. (5.6-6.6 mm); 

 vitellus 1.4 mm. average (range 1.3 to 1.6 mm); 

 vitellus black or brown above, white or yellowish be- 

 low. Season, June 25 to July 25. Rana septentrionalis. 

 gg. Average outer envelope 3.8 mm (range 3.4 to 5.4 mrn, mode 

 4.0 mm). Egg complement, 1,054. Season, April 15 or 

 earlier to August 21 (Fig. 21) Rana sphenocephala. 



