64 c Canadian Arctic Expedition, 1913-18 
Johansen in his notes sketches one of the puparia so curved that the cephalic 
extermity extends to or ahiiost to the surface, which is assumably the position 
immediately before the emergence of the imago, but all the empty puparia in the 
collection are nearly straight. (Rearing 78). 
The puparium of Hydrophoria, an aquatic genus, is not conspicuously 
dissimilar from those of terrestrial Anthomyiidse, showing no caudal modification 
or specialization such as is shown in the present genus. 
The imago bears a resemblance to some species of Aricia, but differs in 
having the facalia hairy for a greater length above the vibrissse, the third antennal 
joint much shorter, the under scale of calyptrse much narrower, and the fore tarsi 
without spines on ventral surfaces. The female resembles Aricia also, but has, 
in addition to the differences present in the males, the orbits much inore hairy, 
the upper portion with a double series of long, hair-like bristles, the outer series 
directed out over the eyes. 
In some respects the genus resembles Trichophthicus, especially in the 
character of the fore tarsi, but the tibiae in Trichophthicus are strongly spinose, 
the third antennal joint is much longer than the second, and the hind coxae 
have hairs above at apex. 
Aricia Robineau-Desvoidy. 
I refer one species in this collection to this genus, although the male differs 
in many respects from the genotype, and in general habitus resembles Trich- 
opticus Rondani. From Trichopticus the present species differs in having the 
posterior coxse bare above at apices. 
Aricia borealis, n. sp. 
Male. Black, shining. Interfrontalia opaque black, orbits silvery pilose. 
Thorax very slightly greyish priunescent, not distinctly vittate. Abdomen 
when viewed from behind, Avith brownish pruinescence and a black median 
longitudinal stripe. Legs black. Wings slightly greyish, fuscous at bases. 
Squamae yellow. Halteres black. 
Eyes bare, separated by about one-seventh the head-width; orbits linear 
above, not one-third as wide as interfrontalia at its narrowest point; antennae 
short, third joint 1-5 as long as second; arista almost entirely nude; cheek with 
many long hairs; vibrissa poorly differentiated; orbit in profile projecting 
beyond eye farther than width of third antennal joint. Presutural acrostichals 
irregularly four-rowed; postsutural dorso-centrals four in number; prealar 
bristle weak but distinguishable; sternopleura with long hairs and two strong 
bristles; pteropleura and hypopleura bare. Abdomen subcylindrical, slightly 
tapering to apex; fifth sternite with small rounded central excavation in posterior 
margin. Fore tibia with three to four bristles in a single series on apical third of 
postero-ventral surface; mid femora slightly attenuated apically, with two to 
three long bristles at base on anterior side; mid tibia with almost the entire 
length of the postero-dorsal surface with short bristles, two to three on posterior 
surface, and three to four on postero-ventral surface beyond middle; hind 
femora with bristles on entire length of antero-ventral surface, the postero- 
vental surface unarmed; hind tibia sHghtly curved, the apex on ventral side very 
distinctly produced, anterior and posterior surfaces with short, regvdar, setulose 
hairs, those on postero-dorsal surface longest (PI. IX, fig. 27) ; hind tarsi with 
a pair of bristles at base of first joint noticeably longer than the others. Last 
sections of third and fourth veins parallel; outer cross-vein slightly curved, last 
section of fourth vein 2-5 as long as preceding section. 
Length, 7-5 mm. 
Type locality: Bernard harbour, Dolphin and Union, strait, Northwest 
Territories, July, 1916 (F. Johansen). 
