264 BARBOUR: ZOOGEOGRAPHY. 



stantly in color that they can not be considered the same as the Jamaican species, 

 which doubtless gave rise to the Cayman Brae form. Yellow, dark-rimmed 

 ocelli are always present in Jamaican examples, sometimes only a very few, quite 

 scattered, and again plentiful in numbers and arranged in regular series. In 

 many individuals these have a tendency to become confluent and to give rise to 

 lines upon head and neck. These do not occur in S. argivus, the color of which 

 Garman has adequately described. On the mainland these individuals would 

 be considered as representing geographic races or subspecies, and where their 

 ranges overlapped intergrades would be expected and found. But when the 

 individuals are confined upon islands, no intergrading on account of the geo- 

 graphic discontinuity of their ranges can take place. Under these conditions 

 it is not unreasonable to consider these very similar forms "species." Werner 

 has described S. argus continentalis from Honduras, a fact of the greatest zoogeo- 

 graphical interest. Its importance is emphasized by this trinomial designation; 

 yet for the sake of consistency, we would suggest that the species be known as 

 S. continentalis Werner (Verh. Zool. bot. gesellsch. Wien., 1896, 46, p. 345). 



Sphaerodactylus notatus Baird. 



Baird, Proc. Acad. nat. sei. Phila., 1858, p. 254. Boulenger, Cat. lizards Brit, mus., 1885, p. 226. 

 Barbour, Bull. M. C. Z., 1904, 46, p. 57. Stejneger, Bahama Islands, 1905, p. 331. Rosen, 

 Lunds univ. arsskrift, 1911, 7, no. 5, p. 27. 



There are specimens in the Museum from Key West, Florida, where the 

 species was doubtless accidentally introduced ; Havana, Cienfuegos, San Diego de 

 los Bahos, Jiguani, and Guantanamo, Cuba, Little Abaco, New Providence, and 

 Stranger's Cay, Bahamas. It has also been reported from San Domingo and 

 Great Abaco. The San Domingan specimens are undoubtedly S. difficilis Bar- 

 bour. 



Sphaerodactylus exsul, sp. nov. 



Type: — No. 7,894, M. C. Z. an adult. Little Swan Island, Caribbean Sea, 

 March, 1912, George Nelson, collector. A fine series of paratypes. 



Closely related to S. notatus Baird from which it has apparently been derived. 

 Similar to this species in all the general features of its squamation but differing 

 markedly in having slightly smaller and very much more weakly keeled dorsal 

 scales. Its coloration is similar in type but much brighter and more varied. A 

 conspicuous spectacle-like marking with two white spots is often seen on the 

 posterior neck region. I have not observed this in S. notatus. 



Mr. Nelson says that these little lizards are very abundant in the accumula- 



