60 c Canadian Arctic Expedition, 1913-18 



FEMALES. 



1. Anterior thoracic spiracle with yellow-haired covering-flap; calyptra; white, .regina Meigen. 

 Anterior thoracic spiracle with black-haired covering-flap; calyptrae brown. . ■ 2 



2. Anterior spiracle very large; orbit about on'e-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 interfrontaha below- 

 anterior ocellus; face moderately produced below terrce-novoe Robineau-Desvoidy. 



ANTHOMYIID^. 



The larvae 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 upop other insects, especially Diptera. 



Recently I published a key to the subfamilies of Anthomyiidse in The 

 Canadian Entomologist, 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 deaferibed 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 PhaoniNjE in Collection. 



MALES. 



1. Hind tibia with a long bristle beyond middle on the postero-dorsal surface Phaonia. 



Hind tibia either without any bristle as above, or there are several of equal. length in a 



series on postero-dorsal surface ; 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 ventraUy 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 httle longer than second; arista much thickened and densely 



short-haired basaUy; facalia hairy more than mid-way to antennse; bristles on tibiae 



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 tibiae with a number of bristles on posterior and 



postero-ventral surfaces Aricia pt . 



Abdomen with paired spots on dorsum; mid tibiae 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 tibiae with long, preapical postero-dorsal bristle Phaonia. 



Hind tibise 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. 



Orbits hairy or almost bare, with only one series of bristles 4 



4. Mid tibiae without short bristles on postero-ventral surface Limnophora. 



Mid tibiae 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 



1 Can. Ent. vol. 49, p. 406, 1917. 



