296 



NORTH AMERICAN DIPTERA 



Family Pallopteridae 



Flies of medium size, usually with pictured wings, the auxiliary 

 vein entire. 



Head higher than long; oral vibrissa? absent; a single pair of frontal 

 bristles; ocellars present; post-oeellars parallel; face slightly receding; 

 antennae rather short, the third segment oval; arista short plumose or 

 bare. ]\Iesonotum bristled in front of the suture (except in two species) ; 

 propleural 1)ristle usually absent; one sternopleural bristle, l^egs of 

 moderate length; tibiffi without preapical bristle. Wings rather large; 

 anal cell short, the anal vein extending to the wing margin; auxiliary 

 vein free but ending close to the first vein, the costa weakened or broken 

 at the point of union; apical cell not narrowed apically. Abdomen 

 elongate oval, sub-cylindrical, the ovipositor flattened and elongate. 



These flies are found in moist and shady places, usually upon 

 foliage, and along the sea-shore. 



Pallopteridae. — 1, Palloptera arcuata; 2, 8, Omoinjia hirsuta: 4. Palloptera jucunda. 



