Strecker — Notes on the Robber Frog. 75 



ever, is the same as that of adult examples. Attains a 

 length of 3Vo inches. An example collected April 13, 

 1910, had the ground color of the upper surfaces a beau- 

 tiful pearl gray. 



Habitat Associations. 

 The Robber Frog has been observed by the writer in 

 two similar localities in the vicinity of Waco : — 



(1) Flat Rock Creek, McLennan County (Hewitt Sec- 

 tion, altitude 625 to 655 feet), an intermittent stream 

 flowing through a stretch of prairie land. Banks of soft 

 shaly white limestone, filled with cavities and fissures. 

 Large fragments have been broken loose from the bluffs 

 from time to time and strew the bed of the stream. Sev- 

 eral trips have been made to this place and in each case 

 the same species of reptiles and amphibians have been 

 obtained. The most characteristic reptile is an iguanian 

 lizard — Holbrookia texana Troschel — which is equally 

 abundant on the bluffs and among the rocks below them. 

 Numerous examples of Long's Garter snake, Eutaenia 

 proximo, Say, and the diamond-marked water snake, 

 Tropidonotus rhombifer Hallowell, haunt the neighbor- 

 hood of the deeper water holes, where they find abundant 

 food — Leopard Frogs, Cricket Frogs, and small fishes. 

 Two species of Toads, Bufo valliceps Weig. and Bufo 

 americanus Le Conte (large dark type), scorpions, 

 Buthus, and large ground spiders are found in fissures in 

 the banks and in hollows under the larger rocks. Whip 

 Snakes, Zamenis flagelhim Shaw, of the pale prairie type 

 resort here in numbers for the purpose of feeding on the 

 lizards and the large grasshopper, Schistocera americana, 

 which forms their principal food. The following species 

 of mollusks are abundant : Polygyra roemeri Pf r., Poly- 

 gyra texasiana Mor., Bulimulus dealbatus mooreanus 

 Pfr. The rocky bluffs are low, averaging less than a 

 dozen feet. 



(2) Nameless Gully, three miles north of Waco, head- 

 ing near Walker's Crossing on the Bosque River. Banks 

 of soft shaly limestone, interspersed with stretches of 



