436 
THE STUD Y OF JN SECTS. 
While still anchored by its legs the midge rests on the sur. 
face of the water for one or two seconds and unfolds its 
wings; then freeing its legs it takes flight. The adults 
emerging from the deeper water were swept away by the 
current before they had a chance to take wing. The time 
required for a midge to work its way out of the pupa-skin 
varied from three to five minutes. 
Family Dixidje (Dix'i-dae). 
The Dixa-midges. 
These midges closely resemble mosquitoes in size and 
form ; but they are easily distinguished by the venation of 
their wings (Fig. 509). 
Fig. 509.—Wing of Dixa . 
The wing-veins are not furnished with scales, and are 
distinct over the entire surface of the wing; vein I is pro¬ 
longed into an ambient vein; vein II is well 
developed, but is short, ending in the margin of 
the wing near its middle, ana before the first fork 
of vein III; vein III is four-branched ; vein V is 
two-branched; cell V, is not divided by a cross¬ 
vein ; and vein III, extends parallel to the mar¬ 
gin of the wing to a point on the outer end 
of the wing. The antennae (Fig. 510) are six- 
teen-jointed, and differ but slightly in the two 
sexes ; the legs are very long and slender; and 
he caudal end of the abdomen of the male is fig. 5 ia 
enlarged. 
