THE BAtRACHiA OF NORtH AMERICA. 309 



couuecting tlie posterior nares. Eyes very proiiiineut. From these a 

 strong fold passes the posterior to the augle of the month aud across 

 the gular region ; tympanum covered by a portion of the parotoid 

 ghiiid anterior to this. Parotoid proper very large, extending beyond 

 sL'a[)ula, bent upon the side; bounded inferiorly by a strong fold, which 

 extends from the one above mentioned to the groin. Below this, on 

 the sides, are two or more other folds. Skin of upper surfaces coarsely 

 tuberculous ; that of the crown thick, of the extremities nearly smooth. 

 A large gland occupies most of length of tibia. Abdomen minutely, 

 l)ubic region coarsely, rugose. Cuneiform process rather short, very 

 prominent. Ghoaniie smaller than ostia pharyngea. Tongue entire, 

 with a narrow free anterior border, one-third iree posteriorly. Ex- 

 tended heel reaching front of humerus; tibia three times as long as in- 

 terorbital width. Three phalanges of fourth toe iree from web. Color 

 in spirits; above ashy brown, below yellowish ash. 



Measurements of No. 3694. 



M. 



Lengtli of head anil body 055- 



Leugtb of head lo parotoid fold 015 



Widih of head at cauthns oris ^ 023 



Length of fore limb from axilla 023 



J.cngth of bind limb from groin 052 



Length of tibia 0175 



Length of tarsns 0002 



Length of rest of bind foot 0204 



The characters which distinguish this species are numerous. In its 

 general appearance ,it has a great resemblance to the Bufo compactiUs 

 of the SLime country. But one s{)ecinion is known. 



ifo. 3G94; one specimen ; Yalley of Mexico ; J. Potts : alcoholic. 



CYSTIGNATHID^. * 



Baiiidce, part., CyHtlgnaihldn', part., Discoglossidce, part., Alytidw, part., UperoUidce, 

 Bomhi)iatorid(f, part., Hi/Iodidw, part., Giintlier, Cat. Batr. Sal. 



Cystignatliidw Co\^c, Nat. Hist. Rev., 1865, pins Scaphiopodidce, part. 



Ciiaiignalldda'. Cope; Jonrn. Ac. Piiila. (2), w, 1866; Bonlenger, Cat. Batr. Sal., Brit. 

 Mns., ii ed. 1882. 



Bomhuialoridcc,Y)iirL, Pleclromantidoe, J?,)/fW«;, part., Polypedatidoe, part., EaHifZcc, part., 

 Discojlossidoc, xiart., Mivart, Proceed. Zool. Soc, 1869. 



Vertebrae procoelous; no ribs ; sacral diapophyses cylindrical, obtri- 

 hedral or slightly depressed distally, inclined upwards. Urostyle sepa- 

 rate, attached to two condyles, without diapophyses. Terminal phalan- 

 gos conti aous, either uniformly conic, or with divergent terminal proc- 

 esses or their rudiments. Sternum distinct. No teeth on the mandible. 



This, after the Hylida) the most extensive family of the Arcifera, em- 

 braces one hundred and fifty-six species, which represent thiity-sevcn 

 generic types. 



Th i most cirapletely developed genus exhibits a cranium without 



* Plates 70, 71. 



