APTERYGOTA OF ALASKA 



BY JUSTUS WATSON FOLSOM 



This paper deals with the Collembola and Thysanura collected 

 in Alaska in June and July, 1899, by Professor Trevor Kincaid, 

 of the Harriman Expedition, with the addition of a few forms 

 collected by him in 1897. These are especially welcome as 

 nothing has been published hitherto concerning the Collembola 

 of Alaska, and because, with three exceptions, all of Professor 

 Kincaid's species are either new or little known. Moreover, 

 they suggest interesting problems in geographic distribution, 

 a subject yet in its infancy, as regards this group. Fourteen 

 forms are here described as follows : 



Neanura gigantea Tull. 

 Neanura ornata sp. nov. 

 Anurida amorita sp. nov. 

 Aphorura octoptmctata (Tull.) 

 Aphorura dentata sp. nov. 

 Isotoma Jimetaria (L.) Tull. 

 Isotoma viridis Bourl., type. 

 Isotoma viridis Bourl., var. 

 arctica Schott. 



Entomobrya kincaidi sp. nov. 

 To?nocerus niger Bourl., type. 

 To?nocerus niger Bourl., var. 



arcticus Schott. 

 Tomocerzis niger Bourl., var. 



americanus Schott. 

 Papirius pahnatus sp. nov. 

 Machilis arctica sp. nov. 



Types of the above species and subspecies have been de- 

 posited in the United States National Museum, and all the 

 Harriman specimens retain the numbers of the original labels. 



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