THE CANADlAxN ENTOMOLOGIST 11 



11. Arista with its longest hairs barely longer than its basal 



diameter persimUis Malloch . 



Arista with its longest hairs, longer than width of third antennal 



segment urbana Meigen . 



Ophyra Robineau-Desvoidy 

 There are but two species of this genus known to me as occurring in America 

 one of which, leiicosioma, occurs in Europe and in Canada and all over the 

 United States, though less common in the south. The other species is con- 

 fined to the southern United States in North America, but extends through 

 Central and South America. The larvae feed in latrines and in manure. 



Key to Species. 



1. Males 2. 



Females 3. 



2. Hind tibiae much curved, ventral surfaces with long, soft hairs which are 



longest just basad of middle; calyptrae fuscous; palpi 



black , leucostoma Wiedemann. 



Hind tibice but little curved, ventral surfaces with decumbent setulose 

 hairs; calyptrae yellow; palpi ferruginous aenescens Wiedemann. 



3. Calyptrae subfuscous, the margins darker; palpi black; hind tibia with 3 



to 6 anteroventral bristles leucostoma Wiedemann. 



Calyptrae yellow; the margins concolorous; palpi ferruginous; hind tibia 

 with 1 or 2 anteroventral bristles aenescens Wiedemann. 



Tetramerinx Berg. 

 Key to Species. 



1. Legs black, bases of tibiae and extreme apices of femora reddish; abdomen 

 with a dark dorsocentral vitta; face, parafacials, and cheeks white, 

 almost silvery; wings milky, veins brown; hind tibia with three or 



four an terodorsal bristles iinica Stein. 



Legs black, all of tibiae and extreme apices of femora reddish yellow; 

 abdomen with black dorsocentral vitta and lateral spots; face, para- 

 facials, and cheeks brownish or bronzy; wings slightly grayish, veins 

 dark brown; hind tibia with two anterodorsal 

 bristles californiensis Malloch. 



Phyllogaster Stein 



Key to Species. 



1. Males ' 2. 



Females 4. 



2. Mid femur with some long, strong bristles on basal half of antcro- and 



posteroventral surfaces; hind femur with rather widely placed bristles 

 on entire length of anteroventral surface; abdomen with dorso- 

 central vitta and lateral spots; mid tibia with an anterodorsal 



bristle rohusta Johnson . 



Mid femur without anteroventral bristles on basal half; hind femur with 

 a few strong bristles on apical half of anteroventral surface; mid 

 tibia without an ajnterodorsal bristle 3. 



