CROCODILIANS, LIZARDS, AND SNAKES. 



777 



Baird and Girard give the following scutal formulas and measure- 

 ments, the latter in inches : 



Gastrostegea. TTrosteges. Length. Tail. 



Rio Grande River 138 + 1. 45. Tf. li- 



Red River, Arkansas 148 + 1. 40. 12. 1^. 



Fort Webster, New Mexico 146 + 1. 34. 21. 2^. 



Sonora, Mexico 150+1. 39. 24. 3. 



I add the following: 



Cat. Nos. Gastrosteges. TTrosteges. 



9524 134 + 1. 42. 



4323 136 + 1. 47. 



1225 146 + 1. 33. 



7813 147 + 1. 23. 



Heterodon nasicus nasicus Baird and Girard. 



Catalogue 



No. 



8545 

 7813 



8414 

 9323 



9524 

 1262 



9127 

 4323 

 1285 



1253 



1249 

 5083 

 4961 

 1278 



8025 

 8412 

 1434 

 11817 

 13965 

 12747 

 15340 

 21266-68 

 21269 



22137 



Number 

 of speci- 

 mens. 



Locality. 



Santa Pe, New Mexico. . . 



Fort Union, New Mexico 

 i'ort Riley, Kansas 



"When 

 collected. 



New Mexico Aug. — , 1874 



liig Windy River, Mon- — , 1874 



tana. 



Fort Lyon, Colorado 



f'obre mines 



Yellow.stone River I Aug. — , 1873 



Montana ' 



Red River, Arkansas 



-do 



Eagle Pass, Texas 



Wheelock, Texas 



Pecos River, Texas . . . 

 Mills Rivei-, Montana. 



From whom received. 



Nature of 

 specimen. 



Howard . 



Fort Wliipple, Arizona . . 

 Santa Fe, New Mexico. . . 



Platte River 



Old Fort Cobb 



Sept. — , 1874 



Texas 



Sand Hills, Nebraska 



Loug Pine, Nebraska 



Chamberlain, North Da- 

 kota. 

 Las Cruces, New Mexico, 

 experiment station. 



Peter Connell 



Dr. B. J. D. Irwin, U. 



S.A. 

 Dr. O. Loew 



Dr. E. Coues, U. S. A ... 



E. Palmer 



Col. J. D. Graham, U. 



S.A. 



Prof. J. A. Allen 



Dr. E. Coues, U. S. A . . . . 

 Capt. R. B. Marcy, U. 



S.A. 

 Maj. W. H. Emory, IT. 



S.A. 



A.Schott 



F.Kellogg 



Capt. John Pope, U. S. A 

 Dr. Geo. Suckley, U. 



S.A. 



E. Palmer . 



Dr. H. C. Yarrow 



W.S.Wood 



E. Palmer 



H. W. Henshaw 



J.H.Clark 



Dr. D. W. Prentiss 



U. S. Fish Commission . 

 do 



T. D. A. Cockerell 



Alcoholic 

 type. 

 do. 

 do. 



do. 

 do. 



do. 

 do. 



do. 

 do. 

 do. 



do. 



do. 

 do. 

 do. 

 do. 



do. 

 do. 

 do. 

 do. 

 do. 

 do. 



There are three genera of this subfamily, which difl'er as follows: 



Geneial plates jiaired, longitudinal Petalofinathus Diimoril and Hilirou. 



Geneial plates paired, transverse Leptof/nathu.s Dumeril and Bibron. 



Geneial plates inclosing a median shield Mesopeltis Co))e. 



I have referred to this family several genera from the Oriental 

 (Paleotropical) Realm, as Parms, A.sthenodipsas, Dipsadoboa, etc.; but 

 an examination of the penial and pulmonary structures shows that 

 Parem belongs to the Oalamarina', and I susi)ect that the other Oriental 

 genera are allied to it. Thus reduced, the Leptoguathinai include only 

 Neotropical species, and none of these are found in the West Indian 

 district. The species are numerous in the Central and South Ameri- 



