ARACHNIDA 5 1 



Probably all of those recorded by Butler are in this collection. 

 The Thei-idhun I consider as a young Lathrodectes ; the Lycosa 

 as one of the three species, but none agree with Nicolet's figure ; 

 and the Androctomcs was probably one of the two scorpions. 



Of those recorded by Marx all but two are represented in this 

 collection; the Segestria and the Agalena. Dr. Marx never 

 published descriptions of the new species mentioned. His Filis- 

 tata and Loxosceles agree with my species of the same genera ; 

 his Menenierus is Plexippus -paykiilli; his Centruroides is Cen- 

 trurus ^rtnceps ; his Vejovis is Hadruroides hcnattis, and his 

 Lathrodectes scelio was probably the young of L. apicalts. 



Many of the spiders collected by this expedition and not col- 

 lected by others were taken in December, January, February 

 and March. Other species will doubtless be found in Septem- 

 ber and October, so that the total Arachnidous fauna of the 

 islands will probably reach one hundred species. 



With one important exception all the large groups of Arach- 

 nida are represented. There is no Phalangid. The presence 

 of a Solpugid is unexpected, and it must have been a rare acci- 

 dent that stranded one of these animals alive so many miles 

 from the mainland. 



AFFINITIES OF THE FAUNA. 



As to the affinities of the spider-fauna of these islands, it 

 should be stated that a number of the new species belong to 

 groups which have been but little collected on the mainland, 

 and therefore may yet be found to occur elsewhere. This is 

 illustrated by the fact that one species described by Butler from 

 these islands now turns out to be identical with a species com- 

 mon in Mexico and the southwestern United States. 



The affinities of the fauna can best be shown by tabulation. 

 I have arranged them in five groups. 



Cosmopolitan. 



No. of specimens. 

 Tege7iaria derha7ni on shipboard i . 



Co77i77ion T/'opical Species. 



Argiope arge7ttata 64 



JIete7-opoda veiiatoria 6 



Plexippus paykulli 2 



Total 72 



