800 



AN INTRODUCTION TO ENTOMOLOGY 



jackets. Serious outbreaks of these pests have occurred at various 

 times in Ohio, Indiana, Ilhnois, and Cahfornia. In the case of the 

 species infesting ranges, pastures, and grain and alfalfa fields in 

 California it was found that the larvse usually come out upon the 

 surface of the ground during the night and could be destroyed by the 

 use of poisoned-bran bait, made by mixing one pound of Paris green, 

 twenty-five pounds of bran, and sufficient water to make a flaky 

 mash. The bait is applied with a broadcast grain seeder. 



Family DIXID^ 

 The Dixa-Midges 

 These midges closely resemble mosquitoes in size and lorm; but 



they are easily distinguished by the venation of their wings, 

 loio). 



(Fig. 



Fig. loio. — Wing of Dixa. 



The wing-veins are not furnished with scales, and are distinct 

 over the entire surface of the wing; the costa is prolonged into an 

 ambient vein, the subcosta is well de- 

 veloped, but is short, ending in the 

 margin of the wingnearitsmiddle,and 

 before the first fork of the radius; the 

 radius is four-branched, 

 the vein Ri extends par- 

 allel to the margin of the 

 wing to a point on the 

 outer end of the wing; 

 the media is two-branch- 

 ed; and themedial cross- 

 vein is wanting. The an- 

 tennas (Fig. I on) are 

 sixteen-jointed, and dif- 

 fer but slightly in the two 

 sexes; the legs are long 

 and slender; and the cau- 

 dal end of the abdomen Fig. ioi2.-Larva of Dixa, 

 ot the male is enlarged. (After Needham and Lloyd.) 



Fig. loii. 



