302 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



Measuremenis of No. 13629. 



M. 



Leugtli of head aud body 061 



Leugtli of head, iucludiug tympana 020 



Width of head at borders of tympaua 027 



Length of fore limb 0315 



Length of hind limb ,. 0606 



Length of tibia 021 



Length of tarsus Oil 



Length of rest of posterior foot 024 



This species is intermediate iu its characters between the 8. holbroolcii 

 aud the other species of the genus. The frontoparietal interorbital 

 space is wider than in the latter, but not so wide as in the former. Tlic 

 tibia is very short, giving the animal a more squat ap])earance than the 

 S. liammondii. 



In the typical specimen the labial border projected beyoud the line 

 of the muzzle, so that the profile sloped to it downwards aud forwards. 

 1 have seen no second specimen like it, but specimens which agree with 

 it iu every other respect occur in the same zoological district. I am in- 

 clined to think that this peculiarity of the type specimen (which is not 

 represented in Baird's plate, I. c.) is only an individual one. The other 

 forms pass directly into each other. 



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

 and the corresponding part of the Lower Californian. Within the 

 limits of the United States it has been found only in southwest Texas. 



ScapMopus couchii Bd. 

 EESERVE SERIES. 



Catalogue 

 number. 



5893 

 12657 

 136-29 



No. of 

 spec. 



Locality. 



Matamoros, Mex 



Cape Saint Lucas, Cal . . 



La Paz, Cal 



Helotes, Bexar County, 



Tex. 

 (?) 



W^heu 

 collected. 



1882 



From -whom received. 



Lieutenant Coucli (Ber 

 landier collection). 



John Xantus 



L. Belding , 



G. W. Marnock 



(?) ■ 



Nature of spec- 

 imen. 



Alcoholic. 

 Do. 

 Do. 



Do. 



SPEA Cope. 



Journal Academy Philadelphia (2), vi, 1886, p. 81. 



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

 parietal fontanelle ; vomerine teeth present; toes webbed; cuneiform 

 process large. 



In this genus we have permanently preserved characters which de- 

 fine an immature stage of Scaphiopus. In one of the subspecies of 

 the S. liammondii the ossification of the cranium has progressed so far 

 as to close the frontoparietal foutauelle, but not so as to penetrate the 



