THE AMPHIBIA OF OKLAHOMA 



Craig County in north, Coal County in south but east of a line between these only 

 along Arkansas River. Abundant from east central Oklahoma westward 



Rocky Mountain Toad, Btifo ivoodhoitsii tvoodhoiisii Girard.'^ 

 10. Eggs floating free at surface of water 11 



10. Eggs attached 16 



11. Eggs black and white 13 



11. Eggs not black and white 12 



12. Eggs brownish and cream or yellow and produced in small packets; egg size 

 0.8-1.6 mm.; outer envelope 3.6-4.0 mm. in diameter, poorly defined; inner enve- 

 lope 2.2-3.4 mm. and well defined. Extreme southeast only. Rare 



Green Tree Toad, Hyla cinerea cinerea (Schneider). 



12. Generally similar to above (12) but envelopes different: outer 4.0-8.0 mm.; inner 

 1.4-2.0 mm. in diameter; eastern half of Oklahoma. Abundant. 



Common Tree Toad, Hyla rersicolor versicolor (Le Conte).^ 



13. Individual eggs less than 1.0 mm. in diameter (0.8-0.9 typically); egg envelope 

 2.8-4.0 mm. in diameter; eggs occur scattered over surface singly or in small 

 groups. (Microhyla) 1"! 



13. Individual eggs more than 1.0 mm. in diameter (1.2-1.7 typically); egg enve- 

 lopes wider (typically 3.0-5.0 mm.); eggs occur in continuous rafts sprawled on 

 surface 15 



14. Egg envelope truncate, flat above; west to Latimer County in south. Common. 



Narrow Mouth Toad, Microhyla carolinensis carolinensis (Holbrook)^ 



14. Egg envelope not truncate, rounded above; state-wide except in east and possibly 

 Panhandle. Very abundant. 



Northern Narrow Mouth Toad, Microhyla carolinensis oliracea (Hallowell).'' 



15. Eggs in large numbers (up to 50,000) sprawled over surface to 2x3 feet; envelope 

 single. Abundant in all parts of Oklahoma. Bullfrog, Raiia catesheiana Shaw. 



15. Eggs in smaller numbers (up to 8,000) seldom covering more than 1x1 foot of 

 surface (usually half this); envelope double. Eastern half of Oklahoma, rare except 

 in southeast Green Frog, Rana clamitans Latreillc. 



16. Eggs clearly black ami white 17 



16. Eggs not clearly black and white, typically brown or gray and white, cream 



or yellow 20 



17. Egg mass a plinth, attached just below water surface 18 



17. Egg mass not a plinth, irregular and loosely attached to vegetation 19 



18. Diameter of egg not over 2.0 mm., usually less; outer envelope about 3.5 mm. in 

 diameter; black and white regions distinct. Very abundant and state- wide. 



Southwestern Leopard Frog, Rana berlandieri Baird. 



18. Diameter of egg above 2.0 mm., sometimes 2.5; outer envelope wider than 3.5 

 mm. (typically 4.5-5.0 mm.); black and white regions indistinctly separated. 

 Northeastern Oklahoma only. Common but seldom seen. ' 



Northern Crayfish Frog, Rana areolata circtdosa Rice and Davis." 



19. "Eggs in bands 6 mm. across or cylindrical mass on plant stems, the jelly rather 

 firm, the eggs close together, black above and creamy white below" (Wright and 



•' The eggs of Fowler's Toad and the Rocky Mountain Toad are \er\' much alike. In 

 the area of overlap of ranges the adults intergrade and the eggs are so alike that no con- 

 stant differences will separate them. 



"* Eggs of the closely related H. r. chrysoscclis (Cope) are unknown. This form re- 

 places H. f. rersicolor in some deep valleys in McCAirtain and LcFlorc counties. 



5 Recent indications (Hecht and Matalas, 1946) are that the two forms of Microhyla 

 of Oklahoma intergrade in Latimer County and in Texas and therefore henceforth should 

 be consideretl subspecies. I have also seen intcrgrading specimens from Latimer County. 



'• Data from Smith (l'^34) on the Kansas form. Eggs of Rana a. areolata (which oc- 

 curs in southeastern Oklahoma) are still undcscribed. 



