ORDER DIPTERA. 



127 



Family Ephydrinidae. Face convex, with no distinct furrows for 

 the reception of the antennae, and without vibrissue, though fre- 

 quently beset with hairs or bristles; clypeus very much developed; 

 opening of the mouth large; proboscis thickened, with a swollen 



FIG. 148. A, larva of Ephydra californica: a, dorsal, b, under, c, side, view of 

 the pupa, d, Ephydra halophila ; e, its pupa-case. 



chin. Venation of the wings incomplete; the auxiliary vein dis- 

 tinct only at its base; the foremost of the two small basal cells 

 reunited with the discal cell. Middle tibiae with spurs. The sin- 



FIG. 149. Piophila casei, parent of the cheese maggot. 



gular larvae are provided with a long caudal respiratory tube. E. 

 halophila Pack, lives in the brine of the Equality Salt Works, 



