4 c Cana 'ian Arctic Expedition, 1913-18 
. From the above material a good idea of the general facies of the crane-fly 
fauna of the Canadian Arctic Northwest may be obtained. The species are 
almost, if not all, forms of dull, sombre colouration — browns or greys — and most 
of them are of simple, primitive organization. A considerable number show 
unmistakable signs of degeneracy in the wings, this condition being particularly 
noticeable in the Pribilof islands, where fully half of the known species have 
the wings more or less atrophied. In the present collection, two of the Limno- 
biine forms showed the first stages of wing-atrophy, but all of the ten Tipuline 
species are full-winged. Some of the species of Arctic TipuUdse have the head, 
the thoracic intervals, the pleura, coxse, etc., clothed with an abundant long, 
erect pubescence. Many of the Arctic crane-flies seem to be very local in their 
distribution. Thus the collections from the Pribilof islands show not one 
of the species taken elsewhere in the Canadian northwest (with the possible 
exception of Trichocera) . Similarly, the collections of the Harriman expedition 
and the present collections show that the species are in large part very local 
in their distribution, the natural barriers of mountains and large water-bodies 
having proved a very efficient check upon their dispersal. In the present col- 
lection there are a total of sixteen species, only two or three of which have been 
found elsewhere; of these Tipula arctica and Stygeropis parrii are rather well- 
known Arctic American species, and the Trichocera is probably Holarctic in 
its distribution. 
The collection that is reported upon in this paper is constituted as follows: — 
Rhyphidoe — - 
TrichocerinoE — 
Trichocera 
1 species. 
TipulidcE — 
LimnohiiyicB — 
Limnohiini. 
Dicranomyia 
1 species. 
Eriopterini. 
Erioptera 
1 
Limnophilini. 
Limnophila 
1 
Pediciini. 
Tricyphona 
2 
Tipulince — 
Tipulini. 
Stygeropis 
2 
Nephrotoma 
1 
Tipula 
7 
The general tendencies of distribution of crane-flies in the high Arctic 
regions are well shown by the above list, the omnipresent Trichocera, a dominance 
of Pediciine and Tipuline genera, with a smattering of Lirmiobiini, Eriopterini 
and Limnophilini. The extensive tribes Antochini and Hexatomini (in the 
strict sense) ^ seem to be entirely lacking so far as known. The Pty chapter idae 
are likewise lacking and the single record for the Tanyderidm (Protoplasa) is 
unsatisfactory. 
Adult Flies. 
Family TIPULID^. 
Subfamily LIMNOBIIN^. 
Tribe LIMNOBIINL 
Genus Dicranomyia Stephens. 
Dicranomyia Stephens; Catalogue of British insects, vol. 2, p. 243; 1829. 
Dicranomyia alascaensis, n. sp. 
Antennae black; halteres short; wings nearly hyaline, with a large, oval, 
brown stigma ; 8c 2 remote from the tip of Sc\ ; cell first Mo closed ; femora yellow, 
tipped with brown. 
1 Concerning the status of the tribe Hexatomini, read the remarks under the genus 
Poecilostola, page 000. 
