1892.] NATURAL SCIENCES OF PHILADELPHIA. 333 



Acris gryllus Lee. 



Common wherever there is water. 

 Chorophilus triseriatus olarkii Baird. 



Less abundant than the preceding, but found throughout the 

 entire region as far north as explored. The spotted coloration is 

 constant. They sit immersed in the water, with the head projecting, 

 uttering their cry, as they inflate the enormous vocal sac, to which 

 the head appears to be but an appendage. The voice differs from 

 that of the form triseriatus in its more rapid utterance, and the 

 greater distinctness of the rising inflection at the end. 



Spea hammondii bombifrons Cope. 



Abundant near Canyon Tule (Cummins); not seen elsewhere 

 except near Clarendon, where I took one from the mouth of a 

 Heterodon nasicus. 



Rana virescens brachycepbala Cope. 



Found everywhere at water ; the only species of the genus. 



REPTILIA. 



TESTUDINATA. 



Cistudo ornata Agass. 



Abundant on high land. Observed in cojuila in May. 

 Chrysemys elegans Wied. 



Found in all permanent springs, and along streams, often where it 

 has little concealment owing to the shallowness of the water. It 

 often lies partly hidden in mud, and in deeper water, bites the fisher- 

 man's hook. 



Chelydra serpentina L. 



Reported by Mr. Cummins from the head waters of the Brazos. 

 Kinosternum flavescens Agass. 



An abundant species in the region traversed, and represented in 

 my collection by an adult male, and two adult and one young 

 females. The characters are in general those of the C. flavescens 

 Agass., but in some respects it differs from the type specimen. The 

 carapace, though depressed, is a longitudinal oval, the posterior 

 lobe of the plastron is wider than long, and the inguinal region is 

 but shallowly grooved. It agrees with C. flavescens in having 

 the superior anterior angle of the antepenultimate marginal scutum 

 produced upwards so as to notch deeply the penultimate costal 



