III. FAMILY DIXID^E. 



Fig. 27. Di.va species; enlarged. 



After Kellogg. 



Rather small, slender, nearly bare species. Proboscis 

 somewhat projecting ; palpi four-jointed; antennae long, 

 the basal joints thick, those of the flagellum hair-like, 

 and the joints indistinctly distinguishable. Eyes round, 

 dichoptic ; no ocelli. Thorax strongly convex, without 

 transverse suture ; scutellum transverse ; metanotum 

 arched. Abdomen long and slender, composed of seven 

 or eight segments, thickened posteriorly in the male, 

 pointed in the female. Legs long and slender; coxae 

 somewhat elongated; tibiae without terminal spurs. 

 Wings comparatively large; auxiliary vein present, ter- 

 minating in the costa before the middle of the wing ; the 

 second vein arises from the first near the middle of the 

 wing and appears to be the beginning of the third vein, 

 which continues its direction while the second arches 

 suddenly forward at or near the anterior cross-vein and 

 is furcate ; fourth vein furcate ; four posterior cells pres- 



94 



