92 Proceedings of the Biological Society of Wash i nylon . 



derived from a single specimen in British Museum, d<> not refer to Cope's 

 species Sceloporus serrifer (Proc. Acad. Nat. Sci., Philadelphia, 1866, 

 p. 124) the type of which, V. S. Nat. Mus. No. 24868, collected in Yuca- 

 tan by A. Sehott, is now hefore me. This latter is a large, stout lizard 

 with short fourth toe belonging to the S. lorquatvs group as defined by 

 Boulenger, and is consequently very different from the British Museum 

 specimen. Moreover, it. lias the fourth supraocular in contact with the 

 parietal shield, like S. melanorhinus, with the description of which it 

 agrees in most respects, except that it has only 9.-10 femoral pores as 

 against L9-21 in the latter. Further details of the type of S. serrifer may 

 be recorded as follows: Length from snout to vent, 98 mm.; length of 

 shielded pari of head, 20 mm.; length from snout to ear-opening, 23 

 mm.; length of tibia, 21 mm.; fourth toe, without claw, from base of 

 fifth, li.'i mm. ; number of scales from occiput to base of tail, 26; dorsal 

 scales corresponding to length of shielded part of head, 5; scales around 

 middle of body, :!4. The specimen in British Museum, collected by Salle 

 in Mexico, from which Boulenger derived the characters in the synopsis 

 and which he described in considerable detail in his Catalogue (11. cc. ) is 

 quite a distinct species, as correctly suspected by him, characterized by 

 an exceedingly long hind toe like S. woodi. As Dr. A. Guenther was 

 the first to express doubts about its being identical with S. serrifer of 

 Cope it may be properly known as Scrloporus guentheri. 



The Florida species here described has nothing to do with either of the 

 above species being one of the smallest of the genus, although it shares 

 with .S. guentheri the excessively lengthened fourth toe, a character appar- 

 ently unique among the North American species. 



There are, consequently, three distinct species fn Florida, viz., Scelo- 

 porus spinosus floridanus (Baird) which occurs in the extreme north- 

 western part of the State; Sceloporus undulatus (Latreille) of which the 

 National Museum has specimens from northern, north-central and west- 

 ern counties as far south as Pinellas County; and Sceloporus woodi, the 

 species here described from Polk County. The National Museum has 

 also a good series from Georgiana, Brevard County, collected many years 

 ago by Mr. William Wittfield. 



1 have named this interesting novelty for .Mr. Nelson \l. Wood in rec- 

 ognition of his valuable contributions to the herpetological collections of 

 the National Museum. 



