%yi!'''] PROCEEDINGS OF THE NATIONAL MUSEUM. 591 



Posterior to these, the ui>i)er sui race of the lieatl is (rovcird with siiiouth 

 scales. Labial plates without pits. Scales smooth, hroail, poicless. 

 Spurs conspicuous. Gastrostoges narrow. 



In this genus tlio tail is less prehensile than in IJoa, luit is more so 

 than in Eryx and Charina. It also dillers externally from the lattrr 

 genus (with which Garinan at one time pro[)osed to unite it) in the ab- 

 sence of the frontal plate and the parietals adjacent to it. An impor- 

 tant osteological ditference is the presence of the coronoid bone, which 

 is wanting in Charina. 



The species of this genus are variable in their details both as to 

 squamation and coloration. I distinguish three species. Dr. Stejne 

 ger has named another, which be subsequently withdrew. In his hitest 

 study of this genus this author distinguisiies the species as foHows : 



A. Eyo hirgo; its diamoter inoro tbau ono-third disfaiico from anterior cuiithii.s to 

 tip of muzzle ; gastrostej^es about '218. 

 Wlutish with three blackish browii loiigitiuliiiai baud.s in strong; contrast .A. Irivittjata 

 AA. Eyo smaller ; its diameter oiio-third or less tlio distanco from anterior can- 

 thus to tip of muzzle ; gastrostegos '2,'i\ to 241. 

 Color brownish or bluish above, with* or without longitudinal Itands, winch when 

 pres<'nt contrast but littlti with the ground color ; true iorials IJ ; scale rows WJ- 



13 ; rostral not prominent L. rmeofnuva 



Color as iu L. roseofusca ; true loreals 2 ; scale rows 35 ; rostral prominent. />. oiciillii 



Lichaiiura trivirgata Cope. 



Proc. Acad. Phila. IHiU, p. 304; Bocourt, Miss. Sci. de Mexieiu*^ p. r)73; Stojneger, 

 Proc. U. S. Nat. Mus., 18d9, p. 98; 1891, 514; Charina triviryata Garman, Mem. 

 Mns. Conipar. Zool. Cambr., Vlli, 18«3, 13(5. 



The coloration of this handsome Boa is altogether uniijue in the 

 family. It calls to mind the Salvadora of the same region. It inhabits 

 the southern partof Lower California, where Messrs. Xantus an<l Held 

 ing have obtained it for the Smithsonian Institution. They found it in 

 swamps among the mountains. 



No. r-'G02: 40, U: 21."» + 1 + ^4 : 582, !>G mm. 



Lichaniira roseofusca Cope. 



Proc. Acad. Phila., 18(38, p. 2; Stojnegcr, Proc. U. S. Nat. MuwMim, 1891, p.nit ; 

 Lichauina iiniriolepis Cope, Proc. Acad. Phila., 1S(;8. p. 'J; Stejnegcr, Proc. U. S. 

 Nat. Mus., 1889, p. 9(); Lichanura nimpUx Stcj., 1. c, pit. 95, ;ti;. 



A variety of this species is represented by a specimen (No. 1 llL'M) 

 from San Diego, Cal. The color above as far as the lifth row td' 

 scales on each side is a brownish lead color; below this line and on 

 the lower surfaces light lead color with daik lea<l colored iionleis to 

 some of the scales, and a wide lead-colored basal band of the gastros- 

 teges and urosteges. There are three longitmlinal rusty brown bands 

 on the dorsal region, which are indistinctly delined, and of irregular 

 width. No. U1LM>: 42, 14; 22i), 4!> ; 7.s8, 115. 



It was on a specimen of this variety from the same loealit.v tiiat 1 

 ju'oposed the species Licltdnioa mjirioUpis. it has forty- three rows 

 of scales- Another specimen from San Diego is described by Dr. 



