PROCEEDINGS 



OK THE 



WASHINGTON ACADEMY OF SCIENCES 



Vol. II, pp. 477-486. December 20, 1900. 



PAPERS FROM THE HARRIMAN ALASKA 

 EXPEDITION. 



XI. 



ENTOMOLOGICAL RESULTS (5): 



ARACHNIDA. 



[Plate XXIX.] 

 By Nathan Banks. 



The spiders collected on the Harriman Expedition show con- 

 siderable affinity to those of the State of Washington, but there 

 are some, principally among the small Theridiidas, that are 

 peculiar to Alaska. Dr. Marx, in the Proceedings of the En- 

 tomological Society of Washington (Vol. II, p. 186), gave a list 

 of Arctic spiders, including those known to him from Alaska, 

 in which there were 62 species, many of them undescribed. 

 In the list of 52 species given below are at least six not known 

 to Marx. There are no remarkable forms in the collection. 

 Of the five harvest-spiders collected, three are known from Cali- 

 fornia and Washington, one recently described from the Com- 

 mander Islands, and one which appears to be new. The one 

 Pseudoscorpion is common in the coast regions of Oregon and 

 Washington. Of the two mites, one is peculiar on account of 

 its slenderness and armed hind legs. 



Besides the 52 species recorded in the list, there are a few 

 specimens of small Theridiidas which can not be treated with- 

 out more material, including the male sex. 



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