THE CANADIAN ENTOMOLOGIST 77 



Costal setulae strong, longer than diameter of costal vein; mid tibia with 

 an anterior bristle in addition to the other two ; second antennal segment 

 transverse at apex on inner side 4 



4. Hind tibia black ; second segment of fore tarsus less than three times as long 

 as its width at apex, third and fourth segments very much widened 

 similis Malloch 



Hind tibia rufous ; second segment of fore tarsus at least four times as 

 long as its width at apex, third and fourth segments but little widened 

 setosa Stein 



Anthomyia Meigen. 



Kev to Spkcies. 



1. Deep black species, without conspicuous markings aestiva Meigen 



Black species with dense pale gray pruinescence and deep black markings 



on thorax and abdomen .pluvialis Linn? 



Egle Robineau-Desvoidy 

 Only one species, niystacea Coquillett, lacks the distinctive bristle on ,tne 

 anteroventral surface of the mid tibia in the male. The bristle referred to is 

 found in both sexes. Meigen's species, aestiva, does not belong to this genus 

 but to Anthomyia, the propleura being hairy. The species occurs in Newfound- 

 land and Labrador. 



Key to Species. 

 L Mid tibia without an anteroventral bristle; hind tibia with about 9 antero- 



dorsal and 6 posterodorsal bristles. 3 of the latter short 



mystacea Coquillett 



Mid tibia with an anteroventral bristle near middle 2 



2. Abdomen cylindrical, pale gray pruinescent, with a series of black dorso- 



central spots; hind femur usually with 4 widely spaced anteroventral, 

 bristles on apicalhalf; hind tibia with 1 anteroventral. 2 anterodorsal 

 and 2 posterodorsal bristles cinerella Fabricius 



Abdomen depressed, black, slightly pruinescent on each side of median 

 line on dorsum so that when seen from behind each segment has a 

 black vitta which is connected with an anterior transverse band and 

 usually also with one on posterior margin 3 



3. Hind tibia with from 13 to 15 closely placed setulae on anterodorsal surface 



Iiirta Malloch 



Hind tibia with from 5 to 8 bristles of irregular lengths on anterodorsa' 

 surface radiciim Linne 



Of the four species here listed radicum and cinerella are of general dis- 

 tribution and common to Europe and North America. The other two occur 

 in the Western States at high altitudes and mystacea also in the extreme north- 

 west. 



