132 



ANNALS NEW YORK ACADEMY OF SCIENCES 



Table XI 



S. A. only. 

 C. A. onlv. 

 U. S. only. 

 S. A., C. A. 

 C. A., TJ. S. 

 S. A., U. S. 

 S. A., C. A., U. S 



Total S. A. 

 Total C. A. 

 Total U. S. 



Lesser 



21.1 

 2.. 8 

 4.2 



21.1 

 4.2 

 7.0 



39.4 



88.8 

 67.6 

 54.9 



P. R. 



6.9 

 3.4 

 3.4 



17.2 

 3.4 

 3.4 



62.1 



89.7 

 86.2 

 72.4 



Hisp. 



9.4 

 6.3 

 0.0 



21.9 

 3.1 

 6.3 



53.1 



90.6 

 84.4 

 62.5 



Cuba 



10.2 

 4.1 

 6.1 



18.4 

 4.1 

 6.1 



51.0 



8o.7 

 77.6 

 67.3 



.Jam. 



5.9 

 11.8 



0.0 

 11.8 

 17.7 



0.0 

 53.0 



70.6 

 94.1 

 70.6 



As with species, a large part of the genera which are found on the 

 ^'arious Antilles and also on the mainland are wide ranging on the main- 

 land, being found in all three of its divisions. A part of this is, of 

 course, dne to those genera containing wide ranging species which also 

 have species peculiar to the Antilles. We also note that, as with species, 

 the strongest generic affinit}^ of St. Vincent is with South America and 

 probably most of the 15 genera (21.1 per cent.) found in both South and 

 Central America got to or from Central America by way of South 

 America. 



It has already been pointed out that the Porto Rican spider fauna is 

 largely recent. The data for genera as well as that for species indicates 

 that its affinity is probably strongest with South America. It would not 

 be profitable to discuss Plispaniola at length until we know more of the 

 fauna in the interior, but it is interesting to note that no strictly United 

 States genera have been found, and it is safe to predict that further study 

 of Hispaniola will show it to be even more South American than is Porto 

 Eico. 



Chiba has a surprisingly small percentage of United States genera if 

 we leave out of account the wide ranging ones. The facts that 30.0 per 

 cent, of the species which are found on the mainland are not found on 

 the mainland south of the United States as compared with 6.1 per cent, 

 of presumably old genera, and that the figures for those not found north 

 of South America are 3.8 per cent, and 10.2 per cent, respectively indi- 

 cate that the older fauna has a stronger South American affinity than the 

 more recent. The meaning of this will be discussed presently. 



There are only IT genera in Jamaica upon which to base the percentages 

 given in Table XL A strong affinity with Central America in ancient 



1^ For explanation, see text. Based upon 71 genera in tlie Lesser Antilles, 29 in Porto 

 liico. .32 in Hispaniola. 49 in Cuba, and 17 in .Jamaica. 



