XXIII. FAMILY SCHNOPINID^B. 



Flies of moderate or small size; generally black in 

 color and bare. Front not excavated; face bare, short 

 and broad. Antennae approximated at the base, the first 

 two joints short, the third elongated, simple, without 

 style or arista. Proboscis concealed; palpi cylindrical, 

 bristly at the tip. Ocelli present. Males usually holoptic. 

 Thorax rather long, moderately convex, though appar- 

 ently much so from the low position of the head. Scutel- 

 lum broad and short, without spines or tubercles. Ab- 

 domen flattened, or cylindrical, composed of seven 

 segments. Squamae small. Empodia wanting. Third 

 longitudinal vein of the wing furcate; basal cells long, 

 the first much longer than the second; three posterior 

 cells, the first narrowed in, or closed before the margin ; 

 anal cell closed. 



Fig. Si. Scenopinidae. i, Seen op hi us , wing; 2, Scenopinus, head; 

 3, Metatrichia, wing; 4, Metatrichia, head; 5, Pseuda.tr ichia, wing. 



The larvae resemble closely those of the Therevidae. 

 They are very long and slender, having apparently nine- 



208 



