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.] 
BDELLIDy^. 
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. 
TETRANYCHID^. 
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, Jvme 27, 1914. 
Stigmaeus arcticus, n. sp. 
Body bright rose red, legs rather paler, spotted. Body about one and 
tw"o-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 
