h. Family SCIOMYZID^. 



Fig. [28. Tetanocera umbrarum, enlarged. 



Head short*, as broad or broader than the thorax; face 

 more or less retreating ; mouth without Vibrissas at its 

 border, the margin angular. Abdomen composed of six 

 segments, rather long and narrow. Wings longer than 

 the abdomen; auxiliary vein present, distinctly separated 

 from the first longitudinal vein; posterior basal cell and 

 the anal cell complete. Legs rather long; preapical 

 tibial bristle present. 



* The genus Trigonometopus will be brought here by the family 

 table. It has been variously referred to the Heteroneuridse, Sciomy- 

 zidse, Ortalididae, Sapromyzidae by authors. It will be recognized by 

 itsprojecting head and very retreating face. 



(3«) 32i 



