I 





\ ; 



Tin; MATHAflllA <)i' NOIiTll AMKIilCA. 



329 



about twenty or tliiity beats. Tlie xnma can uot be heard at a very 

 great distance. Like Jlyla picl-eringil, this species in confinement can 

 readily be made to producic its note by imitating it, either with tlio 

 voice or tlie ehittering- of two pebbles. It keeps on the high grass in 

 and around marshy pla<!es, seldom if ever ascending trees or bushes. 

 When pursued it leaps with prodigious agility and hides uiuler water. 



Acris (jnjlluH (jryUus Le C. 



lUtna (jrtilhiH Le Coiito, Ann. N. V. Lye. i (IHyf)), Sis'i ; Ifnrlaii, Joiirn. Ac. Nat. Sci. 



V, (1H27), ;!17, ami Med. ami I'liys. Kt-s. (IKC), 101 (copieil). 

 Uaiia ilorstilis Ilarl., .loiirn. Ar. Nat. Sci., I'liila. \ (IfiT), :U7, and Med. and Pliys. 



lies, (l":!.')), Id.''. (FifT. ,11, ],.'2), (Floiida.) 

 Ilijhulin (jrnlhix llolbrook, N. Anit-r. IIcip., 1st od., II (1811.-), /fi, xiii, and 'id cmI., iv 



(l.-'l'J), i:n, xwm, iKirlim. 

 Arris iiriilhiH Dnin. A Hilir., Kip. (i^n., viii (1811), 'iDli; Auj^. Dnni., Ann. Do.s. Sc. 



Nat.,:! scrii', xix (LS"):l), l."):i; OiiiitluT, Cat. IJril. Mns., lf^.'>H, ji. 71, pttiiim; 



l{(>ul('n>,'('r, (Jat. Hiit. Mu.s., ii od.. IH.S'J, p. XW,. 

 Acrin avheld Haird, I'roctu'd. Ac. I'liila., 1KV>, p. '>'.). 



IJody slender ; head jtointed. Limbs much elongated. Head longer 

 tlian wide. Web of hind foot extending only to the third arliculation 

 (irom tip) of longest toe. Tibia two-thirds length of body. Foot more 

 tliaii half length of body. Colors much as in A. crepifaits, but brighter. 

 Inferior surface of thigh plain, or very slightly freckled with darker. 

 A narrow white line irom eye to arm and a light line above the urostyle. 



Having presented a minute descri])tion of ^4. crepitans, \t will oidj' be 

 necessary here to give the prineii)al points of difference as compared 

 witn that si)ecies. The entire form is much more slender, and the limbs 

 longer in i)roi)ortion. The head is much more acute, and the outline of 

 the lower jaw elliptical, instead of being nearly semicircular. The chord 

 of the rami is longer than their greatest Avidth, not e<(ual to it, and the 

 (!left extends further back. The tymi)anum in both is scarcely distin- 

 guishable. The tongue is large, triangular, and Hesliy. The teeth are 

 in two small circidar pat( lies, between the inner nares, and separated by 

 quite an inteival. The pallets at the tips of the more elongated fingers 

 and toes are very moderate, less prominent than in A. crepitans. The 

 fourth or longest toe projects beyond the rest much more than in A. 

 crepitans iwnl the web scarcely extends on either side beyond its ante- 

 penultimate articulation, while in A. crepitans this web reaches to the 

 lienuUimate one and even as Ji very narrow margin to the very tip; nor 

 between any of the i)halanges does the membrane extend to the disks as 

 in (he other. 



The general distribution of color is the same, although the pattern is 

 brighter and clearer. All the blotches have a narrow border of white. 

 The posterior large one seems to extend higher up on the back. The up- 

 l»er jaw has four narrow white lines i)erpendicular to its edge on each 

 side, as in the other species, inclosing nearly equal spaces. There is a 

 light streak down the posterior part of the back above the urostyle which 

 we have not noticed in the other. The dark longitudinal line on the 





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