302 



lUJLLKTlN ;!l, 1:MTI;1) STATKS NATU)NAIi MIISKIJM. 



L(Mi;{(li of lifiul ami body 



L(iif{tli of lujiid, iiiL'liiiliiij; tyiiiimiiii ... 

 Width of lu'iid at lionlcis of tyinpaiia. 



Lt'iijftli of fore limb 



I.i'iilftli of bind limb. 



Mntniirciiii Ills of So. liMi'iK. 



M. 



(Uil 



(>\iO 



(f-i? 



o:!ir) 



ocidd 



r.cnjith of tll)iii •••■il 



l..t'ii{;tli of tiirHiiM Oil 



Lciij^tli of rest of postorior foot 0'J4 



This spc(!ies is iiiteriiicdiiite in its cliiiriU!tois bctwccii tlui *S'. holhroohii 

 Jiiid th(i otlier species of the {,U'ims. Tlie IVoiitoparietal inteiorWitiii 

 space is wider than in tiie liitter, but not so wide as in tlie former. Tlic 

 tibia is very sliort, Jiivinjn' the animal ii more squat appearance than llie 

 iS\ liaiinunnilii. 



In tlie typical specimen the labial border projected beyond the line 

 of the mn/zle, so that the prolile sl()])ed to it downwards and forwar<ls, 

 I have seen no second specimen like it, but specimens which ayree with 

 it in every other respect occur in the siime zooloffic.d district. I am in- 

 clined to think that this peculiarity of the tyi»e spetMmeii (which is not 

 represented in JJaird's ]>Iate, /. c) is only an individual one. The other 

 tbims pass directly into each other. 



The range of this species is the southern part of the Sonoran district 

 and the corresi)onding part of the Lower Californian. Within the 

 limits of the United States it has b;en found oidy in southwest Texas. 



t; 



Scaphioiius couchii lid. 



UESKKVK SICUIES. 



m 



CiitalogiiB 

 iiiiiiilivr. 



12Cr)7 



No. of 

 Hpcr. 





Locality. 



Matnmoios, Mi x 



("iiiiK Saint Liica.s, (-'al . 



r,al'az, Cal 



UclotcM, Hcxar Coll lit V, 



Tox. 

 (!) 



Wlicii 

 lollcctt'd. 



Kroiii «lioiii iT.oiv.Ml. ^'"'"iV,;,!"'" "" 



I"" 



I,it!iitcnaiitConcli (ISor- 



laiidii'i- collcctioii). 



Illllll .\lllltllH 



Ih82 I., litliliiiu 



(i. \V. Maiiiock 



0). 



Alrolidlic. 

 Do. 

 Oo. 



IJo. 



SPEA Cope. 



.ronrnal Academy I'hiiadclpliia (2), vi, ISSti, ji. SI. 



Cranial derm free from cranium ; the latter generally with a fronto- 

 l>arietal fontauellc; vomerine teeth present; toes webbed ; cuneitbrni 

 process large. 



In this genus we have perntanently preserved characters which de- 

 flno an immature stage of Scaphiopus. In one of the subsjjecies of 

 the 8. hanunondii the ossilieation of the cranium litis progres.sed so far 

 as to close the frontopiirietal fMulanelle, but not so as to penetrate the 



; 



