CHARACTERISTICS OF FAMILIES OF DIPTERA. xv 



Family Tachinidie. 



Antennal bristle bare, or covered with minute pubescence. Thorax 

 short. First posterior cell closed, or only faintly open. Abdomen 

 more or less oval, beset with bristles. Legs short. 



Family Dexidct. 



Antennal bristle hairy or pectinated. Thorax short. First pos- 

 terior cell as above. Tegulte large. Abdomen with long bristles on 

 at least the last two segments. Legs long. 



Family Sarcophagidce. 



Antennal bristle plumose or hairy ; apex bare. First posterior 

 cell as above. Tegulai large. Legs stout. 



Family Muscidce. 



Antennal bristle entirely plumose or pectinated. Body stout, 

 thorax short. First posterior cell only slightly opened or else closed 

 at the border of the wing. 



Family Anthomyidce. 



Antennal bristle naked or pectinated. Thorax with a complete 

 transverse suture. First posterior cell fully open. Tegulse not very 

 large. Abdominal bristles often absent. 



Family Cordylurida. 



Neuration complete. Both posterior basal cells large. Auxiliary 

 separated from the first longitudinal vein. Whole lateral border of 

 the front bristly ; anterior border of mouth with numerous strong 

 vibrisste. 



Family Phycodromidce. 



Front bristly ; border of the mouth hairy, with no distinct vibrissse. 

 Legs stout ; tibiae with spurs, and each with a small bristle on the 

 outside, near the tip ; the first joint of posterior tarsi not abbreviated ; 

 last joint of all the tarsi enlarged, with stout claws and long pulvilli. 

 Costa without bristles ; basal cells not small. 



Family Helomyzidce. 



Front bristly on its upper half only. A stout bristle at each side 

 on the anterior border of mouth. Costa bristly. First longitudinal 

 vein not abbreviated, but bare. All the tibiae with spurs, and with 

 a more or less developed erect bristle on the outside near the tip. 



