( 3V 



324 HULLKTIN :U, UNITED STATES NATIONAL MUSEUM. 



district. Bat three of tlie gonerii Ibuiul in tlio latter are known to 

 exist in any other. Tlie poverty of tlie Cliiiian districjt is marked, 

 Willie West Indian species are neiuiy all of <Mie j^enns, tlie Scytopis 

 noted beiny the *S'. niher of Siirinain, wliicli occurs in Trinidad. None 

 of the species ever i)ass these bounds, with the lastnientioned exct'iition, 

 and tbose oi Scytopis renulosits, II:;^mln>m Klhoman/inatHs and xerophijl- 

 liiiH, which occur in the eastern and adjoining- portion of tlie Mexi«ran 

 region. Our knowledge of this subject is, howcner, very incoinplctc. 



In the species of llylidae (joloration may be tlistributed into two 

 regions; the (ir-M including that which is exposed to tlie light when the 

 animal is crouched, with the limbs all Hexed and close pressed to the 

 sides, the hands and feet coniiealed more or less finder the body; and 

 the second embraces what is thus hidden from the light, especially the 

 jiortions in actual contact in llexure. Any marked dilfereiute in color 

 of the different surfaces will usually be found to have reference to this 

 division into regions, generally very dissimilar in appearance. This 

 is well seen in Jfyhi ((lulerNonii, furolineu.si.s, and in I'hyllomedusa and 

 Agalychnis. For convenience of reference, J here, as in otln-r genera 

 of IJatrachia iSalieiitia, term the iiortions of the bixly and limbs which 

 are exposed to tlie light external: those (!oiicealed in the llexure, in- 

 ternal. 



AOIMS Dumeril and IJibron. 



Eq). (icii., \1II, r>(i(i; (iiinllicr, (":i(. Hatr. Sal. Hiit. Miis., I cd., ISM;, p. 

 71; Copt', Nat. Ilisl. Kcv.. l-(i.'>, p. 110; Cope, .lidirii. Ai'. I'liila. (•-♦), 

 VI, I.SIH), •^(i; ItoiiloiigtT, Cat. liatr. Sal. liiit. Mas., l.<--,», ii cd.. p. ;!:{(;. 



But one species of this genus is known, and it is found tlirougli(nit 

 the greater part of the North Ameiican realm. It is <piite ))()ssibh! that 

 it may become necessary at siuno future time to unite this genus with 

 IJyla. 



ACKIS Uh'YLMS L.. Conic. * 



Dmii. iV l!il>r. Erp. (it'ii., viii, .'>(i7: LcConh', I'rorccd. Ac. I'liila., l-.V.. 

 •^•^: l!<.iilfii.;c:. Cat. liatr. Sal. l!iil. Miis.. I.-<-<->, :!:;(;. 

 liana <ir;iUii^ l.c Cinili', .Vim. livcoiiiii New Vnik, i HJ,"), p. 'i&i; llailuii, Mid. I'livs. 



lies., p. i(ll. 

 liuna (Uirsiilix llailaii,/. c, p. in."). 

 IhlhiiU^ tinjllii'^ llollir., N. ,\iiirr. Ilcrp., I'j. :i;i. 



Uead niuderate, length to cam bus oiis e(|ual breadlh ;ii .same point. 

 I\Iuz/,le natrowed. produced ; prolile projecting or m aily perpiMidieular. 

 Ciinthiis rostralis we.ik, aiiproxiiiiale ; e\t«'inal nostril little nearer edge 

 of lip than to orl)it. V'erti'x plaiu'; diameter of orbit greater than iii- 

 terorbital breadth, three times in length from end of muzzle to posterior 

 border of tymiianic membrane. Latter indistinct; piirtially obscured 

 by a fold onetiflh the size d' the orldt. Skin of head :iiid body altove 

 with rather distant tul>ei(des, of which some on the scapular regions are 

 more or less plicifonn. No areolation on tliiiiMcie, and gular region. 

 A seriesof simill tiibeniles on the outer Ixnilei iithe tarsus; twosmiill 

 metatarsal tubercles. Articidar tubercles of the i>halaiiges very siuall. 



•riatc?;!, lij;. ','11. 



