Occasional Papers of flic iMitsciiiii of Zoology J 



bitlar teeth somewhat larger anteriorly, decreasing in size pos- 

 teriorly, sixteen on each side; palatines strong, subequal, 19 on 

 the left side and 17 on the right. 



The largest specimen examined was from the Kissimee 

 River, Florida, and measured 161 2 mm. 



Affinities: That this form is most closely allied to L. getiilns 

 is plainly evident from its form, proportions, markings, copn- 

 latory organ, skull, and scutellation. Its pattern is obviously 

 derived from that of the latter by an obliteration of the nar- 

 row forks on the sides, and an increase in the dorsal and lateral 

 white markings. It is uncertain just how this pattern was de- 

 rived ; but some of the specimens indicate that it may have 

 taken place by the development of new transverse bands from 

 the white central scales midway between the original bands, 

 and by a splitting into two of each white blotch in the ventro- 

 lateral series ; or the increase in number of cross bands may 

 be principally due to a shortening of the dark interspaces. 

 Correlated with the increase in number of white cross bars 

 there occurs a lightening of each dark scale which began near 

 its base and extended from there basally, and then distally, 

 until all the area of these scales, excei)t the distal margin, was 

 lightened. The isolation of this form in the peninsula of Flor- 

 ida, the fact that no Lampropcltis is known from the West 

 Indies, and the juxtaposition of its range to that of typical L. 

 gctulus allows of derivation from the latter species only. 



Remarks : The form here named Horidana has hitherto 

 been included under the name of L. getulus. The striking dif- 

 ferences between some of the specimens from southern Florida 

 and the typical form from northern Florida and the other At- 

 lantic States has not been unnoticed. Loennberg (Proc. U. S. 

 Nat. Mus., Vol. 17, 1894, pp. 324-5) found examples of this 

 subspecies in southern Florida, but considered them only as 



