lo Unn'ersity of Michigan 



enlargement of the dark border common to the third and fourth 

 upper labials. Markings on the posterior portion of the head 

 are infrequent. 



The belly is usually crossed by the continuations of the 

 black and white rings, but, like the dorsal white scales, the 

 white ventral plates are usually conspicuously edged basally 

 with dark brown. Rarely the l)elly and head are without white 

 markings. 



.Iffinities: This form intergrades with L. gctnhis splcndida 

 (JJaird and Girard) in the vicinity of Tucson, Arizona, and east 

 and south of there. In the region of the Florence River, in 

 Arizona, it i)asses into L. gehilus boylii ( IJaird and (lirard), 

 and in Imperial County or eastern San Diego County, Califor- 

 nia, it like-wise intergrades with this form. 



Remarks: Heretofore yuinetisis has been regarded as prac- 

 tically identical with examples from the Cape Region of Lower 

 California, named by Cope co)ijiiiita ( Rroc. Acad. Nat. Sci., 

 Phila., 1862, pp. 301-302). This resemblance is, however, only 

 apparent. Examination of all the material available has made 

 it clear to the writer that these two forms need never be con- 

 fused, that indeed they are not even related directly, — only 

 through boylii can conjiincta be derived from yitiiiciisis. 



Its distinctness from conjuncta will be more clearly brought 

 out in a subsequent review of the genus, but it may I)e well to 

 point out here (i) that the range of conjuncta is separated 

 from that of this fomi by an extension of the range of bovlii 

 into Lower California at least as far south and east as the San 

 Pedro Martir ^Mountains; (2) that conjnncia shows closer 

 affinities with boylii than with this form in the pattern and 

 scalation of the head, and in the fact that its voung are indis- 

 tinguishable in the coloration of the white rings from the young 



