326 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



Acris gryllus crepitans Baird. 



Acris gryllus Dum. & Bibr., Erp. Geo., viii, 1841, p. 506, partbn; Giintlier Cat. Batr. 



Sal. Brit. Mas., 1858, p. 7, partim. 

 Hylodcs grijllm De Kay, N. Y. ZooL, Eeptil., in, 1842, p. 70, PI. xxii, fi;r. 61. 

 Acris crepitans Baird, Proceed. Ac. Phila., 1855, p. 59; L'^ Cnnte, /. c. p. 426; Baird, 



U. S. Mex. Bound. Surv., Kept., p. 28, PI. xxxvn, lii>. 14-17. 



Fig. 82. Acris gryllus creintans. No. 13924. Dcs Moines, Iowa, | ; 6 and 7, f. 



Brownish above. The median region of bead and body above bright 

 green; a dark triangle between the eyes. Three oblique blotches on 

 the sides, nearly equidistant: the first behind the eye, the last on the 

 flanks and running up on the back; all usually margined with lighter, 

 a narrow white line from the eye to arm. Beneath yellowish- white. 

 Inferior face of thigh plain. Tibia a little more than half the length of 

 the body. Foot rather smaller. Head rather obtuse, scarcely longer 

 than broad. Web of hind foot extending to the penultimate articula- 

 tion of the fourth toe. 



This subspecies is characterized by a rather long, narrow head, with 

 the eyes farther back than usual. There is no constriction for the neck, 

 the outline tapering towards the snout from about the middle of the 

 body. The limbs are very muscular, and considerably developed. 



The eyes are large and prominent ; their anterior edges decidedly be- 

 hind the middle of the commissure, and their posterior barely anterior 

 to the angle of the mouth; hence the snout is considerably produced. 

 The nostrils are minute, situated on the canthus rostralis, rather nearer 

 the tip of the snout than the eye, and separated by a distance less than 

 one-third the width of the rami. The tympanum is small, not very dis- 

 tinct, about half the diameter of the eye, and placed just above the ric- 

 tus. The head is almost as long as wide, especially in large specimens. 



The tongue is broad, oval, subtruncate, and but slightly emarginate 

 behind; the anterior extremity rounded; it is free behind and on the 

 sides. The inner nares are large, open, placed a little in front of a 

 point opposite the anterior canthus orbitalis. 



The vomerine teeth are situated in two oval patches about the size 

 of the nares, the slightly longer axes inclined a little to each other, 

 backward. They are placed between the nares, their anterior edges 

 nearly in the same transverse line with those of the nares, and extend- 

 ing a little beyond the nares posteriorly, and thus more anterior than in 

 any other of the small Hjioids of North America. They are about as 



