206 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



M. Diguet in a paper entitled " Sur les Arachnides recueillis 

 en Basse-Californie par M. Diguet." In these two papers 

 the following species are recorded which I have not recog- 

 nized in this collection: 



Chorizomma fallens Sim. 

 Euryfelma steindachneri Auss. 

 Lithyphantes fulvus Keys. 

 Gasteracantha ellipsoides Walck. 

 Misumena americana Keys. 

 Thanatus rubicundus Keys. 

 Seleno-ps aissa Walck. 

 Phidiffus rimator Walck. 

 Pardosa califormca Keys. 

 McBvia californica PecIc. 

 Pcecilochroa concinna Sim. 



A few of these are, I believe, wrong determinations. 



Previous to M. Simon's brief papers, nothing was known 

 of the arachnid fauna of Baja California, nor of the west 

 coast of Mexico; and great credit is due to the collectors, 

 that amid the abundance of material in other groups they 

 should have paused to gather such a collection of spiders as 

 to place our knowledge of the arachnid fauna of this inter- 

 esting region on a solid basis. 



The collection may be roughly divided into two portions : 

 that from the Cape Region of Baja California, and that from 

 Tepic and other places on the mainland of Mexico. The 

 collection from Tepic contains many species known from 

 the southeastern part of the United States, yet with a con- 

 siderable admixture of much more tropical forms. The 

 spiders from the Cape Region of Baja California are more 

 anomalous ; they contain a larger percentage of truly trop- 

 ical species, but yet such a number of forms connecting 

 them to the fauna of the mainland that I did not think it 

 necessary to treat this collection separate from that of Tepic. 

 Guaymas, on the west coast, exhibits many affinities with 

 the fauna of the Cape; while from Orizaba, in east Mexico, 

 come a number of spiders well known in the Atlantic States. 



