XXIII. Family SCENOPINID^. 



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. Scenotrinidae, i, Set' nop in us, wing; 2, Sce>wf>i>ius, head; 

 3, Metatrichia, wing; 4, ]\Ict atrichia, head; 5, Pseudalrichia, wing. 



The larvae resemble closely those of the Therevidae. 

 They are very long and slender, having apparently nine- 



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