TTTTT'PP 



THE IJATUACHZA OF NORTH AMERICA. 311 



Crinkv. — Among these animals I have examined species of IIeliopo« 

 rus, Phityph'ctrum, Crinia, IJorboroca'tes, Eiisophus, and IJyperolia, 

 and in none cau I lind ni )i'e than lateral traces of the epicoracoid and 

 coiacoid septa, excei)t in the Uyperoliti marmorata, where they are coin- 

 l)Iete. Tlie posterior abdominal is well developed in JJmso/jZ/us nchu- 

 losus. 



i'/eio-orfcmfC.— Ventrolateral low down, and posterior abdominal well 

 developed in Vkurodema hihronii. 



i/^iorfcs.— Dorsolateral and ventrolateral far apart; the transverse 

 posterior abdominal septum in the species of Lithodytes, in Ephirejcis 

 longipes, in Enhydrohms vomerinns (Elosia Girard) and HypotUetj/on ri- 

 dens. I hiive not found it in Lithodytes ams2>ivillatus Gthr., Enhydvohim 

 parvus., and Limnocharis/uscus Bell {Elosia Mrt.sM.s' Girard). 



Vystignnthi. — In all the species the structure is similar to that of 

 JJana, except in the approximation of the dorsolateral lines, aiul the 

 l)resence of the postabdominal septum, which is continuous with the 

 latoroventrals, and is indicated externally in several of the species by 

 a fold in its line of attachment. 



The accompanying table exhibits the allinities of the genera and the 

 groups into which they naturally fall. 



This family was first characterized by the autlior in Proceedings Acad- 

 emy Natural Sciences, 1803, 1(J; excluding, however, the genera Cera- 

 tophrys and Tomopterna; and subsequently more exactly in the Nat- 

 ural History lleview, 1805, Several changes, approximations to nature, 

 were proposed by me in 1800. lioulenger adopted this family as I dc- 

 dedned it (Cat. IJrit. Mas., 1882), but modiiied the extent and definitions 

 of the genera materially. 



firoiip I. I'sKTOKS. — rrontoparictiil bones fully (iL'vt'ltii)e(l ; toes webbed, extenial 

 iiictiitarsi iVce; teriiiiiial i)halaiij;e.s acute; .sternum a cartilaginous plate; ear 

 perfectly develoijcd ; ton;;ne broail, euiire, adhrrenl. 



Cephalic derm distinct: vomerine teetli ; no cuneiform shovel or 

 lumbar j;land ; prefrontals closely united; pupilliori/ontal ; no 

 di;;ital dilatations J'xcikUh Wa^fler. 



Cephalic derm distinct; vomerine teetli; no cuneiform shovel or 

 lumbar {flaiul ; prefrontals widely separated from each other and 

 frontoparietals ; ends of digits dilated /.ymipxiin v'ope. 



Cephalic derm distinct ; vomeriue teeth; lingers iincl toes webbed; 

 terminal jthalanges bifurcate; supporting disks.. Oii^roJcdc Ksp. 



Cephalic derm distinct; vcuneriue teeth; a cuneiform shovel; no 

 lumbar glaud ; prefrontals not closely united; pupil vertical 

 MUophjiiH (!ihr. 



Cephalic derm distinct; vomerine teeth; no cuneiform sliovel ; a 

 lumbar gland; i)refrontals well united, transverse. 

 ('jiclorhamphiis Tsch, 



Cephalic derm involved in a rugose cranial ossilication, temporal 

 fossa overarched, completing |)ostorbital arch ; vomerine teeth ; 

 no cuneif(M'ni slutvel or lumbar gland; prefrontals extensively 

 unitedaml prolonged posteriorly CdliiptoccphaluH U. A- B. 



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