The Acarina collected by the Canadian Arctic Expedition, 



1913-18. 



By NATHAN BANKS. 



The Acarina collected by the Canadian Arctic Expedition, 1913-16, include 

 seventeen species, all but one previously known, and recorded from other arctic 

 and subarctic localities, some from widely separated places indicating their 

 occurrence all through the arctic regions. 



The new species of Stigmaeus is the first of this genus to be recorded from 

 the arctic regions, but others are known fairly far north and in high mountains, 

 so that one can hardly be surprised. Doubtless it feeds on moss. 



EUPODID^:. 



Rhagidia gelida Thorell. 



Bernard harbour, Dolphin and Union strait, Northwest Territories, August 

 16, June 19, 1915; in rotton driftwood and under stones; " largest one 2 mm. 

 long; the abdomen dark purple-brown, cephalothorax rose, legs orange." 

 [Johansen notes.] 



BDELLID^. 

 Bdella arctica Thorell. 



Young point, Northwest Territory, July 22, 1916, on rocks on beach; 

 Bernard harbour, Northwest Territories, August 23, 1915; under stones at beach. 

 " Abdomen dark purple, otherwise rose." [Johansen notes.] 



Bdella frigida Banks. 

 Herschel island, Yukon Territory, July 28, 1916, on ground. 



Bdella decipiens Thorell. 

 Bernard harbour, Northwest Territories, May 18, 1915, under stones. 



TETRANYCHIDyE. 

 Bryobia praetiosa Koch. 



Bernard harbour, Northwest Territories, July 19, 1915, on dead Salix- 

 leaves; and October 4, 1914, under stones; eggs doubtless of this species in a 

 cake on stick at Konganevik, Camden bay, Alaska, June 27, 1914. 



Stigmaeus arcticus, n. sp. 



Body bright rose red, legs rather paler, spotted. Body about one and 

 two-thirds times as long as broad, rounded behind, broadest at humeri, narrowed 

 in front; above with about twenty-four long, stiff, erect, rather thickened 

 bristles, in four longitudinal rows; legs (PI. IV", fig. 2) short and stout, first 

 pair hardly as long as body, hind pair reaching very little beyond body; other 

 pairs much shorter; all with fairly numerous long hairs; two long claws as long 

 as the width of the tarsal joint; palpi (P. IV, fig. 1) nearly one-third the length 



