Vol. Xxi] ENTOMOLOGICAL NEWS 39! 



Notes on the Arachnida of Placer Co., California. 



BY KARL R. COOLIDGE. 



The following species of Arachnida were taken by myself 

 at Alta in April and the earlier part of May, 1907. A brief 

 sketch of the region in which I collected has already been given 

 (ENTOM. NEWS, Feb., '08). 



When I first arrived at Alta, on April 6, there was a good 

 covering of snow on the ground and hence little collecting was 

 done until towards the latter part of the month. The next 

 day after my arrival I took a short trip into the American 

 River Canon, which is about a thousand feet below the eleva- 

 tion of Alta, and there several species were taken which were 

 not met with at Alta. Epeira gemma, in particular, was very 

 abundant in the entrances to the old deserted mines of the 

 Forty-niners. 



An Ottonia (Trombidium) locust arum was found under 

 some leaves, and, considering- the threatening weather, I con- 

 cluded to take him in. 



As is well known, the Arachnid fauna of Northern Cali- 

 fornia has many species common to Europe and America, and 

 in California northern spiders extend much farther south- 

 ward than in the Eastern States, although the Pacific latitudes 

 are considerably warmer than the Atlantic ones. A complete 

 Arachnid survey of Placer county should produce interesting 

 results, and I hope, from time to time, to be able to add to the 

 present list. 



With most of the species, I have given the other California 

 localities from which they are known, recorded by Banks 

 ("Some Arachnida from California," Proc. Cal. Acad. Sci., 

 Vol. Ill, 1904) or in my list of the Araneida of Santa Clara 

 county, Cal. Besides those here enumerated, I have a few 

 other species unidentified as yet, and which may prove new. 

 I am glad to be able to here thank Mr. Nathan Banks, of East 

 Falls, Va., for his kindness in identifying various species. 



