60 c Canadian Arctic Expedition, 1913-18 
1. Anterior thoracic spiracle with yellow-haired covering-flap; calyptrge white, .regina Meigen. 
Anterior thoracic spiracle with black-haired covering-flap; calyptrse brown 2 
2. Anterior spiracle very large; orbit about one-half as wide as interfrontaha, face much 
produced below caerula, n. sp. 
Anterior spiracle not very large; orbit less than one-third as wide as interfrontalia below 
anterior ocellus; face moderately produced below terroe-noroe Robineau-Desvoidy . 
ANTHOMYIIDyf:. 
The larvse of this family are in most cases either scavengers or phytophagous, 
the greater number belonging to the former category. A few species are aquatic 
in the larval and pupal stages, and some in the present collection belong to this 
group. 
The imagines of the genus Fucellia, and those of the subfamily Coenosiinse 
are predaceous, feeding upon other insects, especially Diptera. 
Recently I published a key to the subfamilies of Anthomyiidse in The 
Canadian Efitomologist, which key may be used to advantage in connexion with 
the present paper, as the characters used in the key are the basis for the sub- 
family groupings in this paper. ^ 
As two of the genera dealt with in this paper are now described for the 
first time I have given a key to the genera dealt with as an aid to the recognition 
of the new forms.- 
Keys to Genera of Phaoxin.e 'in Collection. 
MALES. 
1. Hind tibia with a long bristle beyond middle on the postero-dorsal siu-face Phaonia. 
Hind tibia either without any bristle as above, or there are several of equal length in a 
series on postero-dorsal sm-face 2 
2. Hind tibia with several long bristles on postero-dorsal surface ■ 3 
Hind tibia with at most a few short bristles on postero-dorsal surface 4 
3. Pteropleura hairy; anterior intra-alar bristle absent or very weak; joints of fore tarsi 
without long bristles at apices ventrally Pogonomyioides. 
Pteropleura bare or with one or two weak hairs; anterior intra-alar bristle strong; basal 
four joints of fore tarsi with long bristles at apices ventrally Pogonomyia. 
4. Third antennal joint very little longer than second; arista much thickened and densely 
short-haired basally; facalia hairy more than mid-way to antennir; bristles on tibia; 
very weak; lower scale of calyptera attenuated posteriorly Mydaeina. 
Third antennal joint much longer than second; species without the above combination of 
characters 5 
5. Abdomen with dorso-central stripe; mid tibiaj with a mnnber of bristles on posterior and 
postero-ventral surfaces Aricia pt . 
Abdomen with paired spots (jn dorsum; mid tibiie with two or three postero-dorsal bristles 
Limnophora. 
FEMALES. 
1. None of the orbital bristles directed forward; cruciate frontals absent 2 
At least the lower one of the supraorbital bristles directed forward; cruciate frontals 
present 5 
2. Hind tibia; with long, preapical postero-dorsal bristle Phaonia. 
Hind tibia; without a long, preapical postero-dorsal bristle, sometimes a few short bristles 
present 3 
3. Orbits hairy and with long, slender bristles in two series, the outer series on upper portion 
of frons directed outward Mydceina. 
()r])its hairy or almost bare, with only one series of bristles 4 
4. Mid tibia' witliout short bristles on postero-ventral surface Limnophora. 
Mid tibia' with one or two bristles on poster-ventral surface .Aricia. 
5. Pteropleura hairy on centre; anterior intra-alar bristle absent Pogonomyioides. 
Pteropleura bare, rarely with a few hairs on disc; anterior intra-alar bristle strong . Pogonomyia 
> Can. Ent. vol. 49, p. 406, 1917. 
