74 



MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE 



tuft of about four long hairs, attached before middle ; head hairs all 

 multiple ; lateral hairs on abdominal segments 3 to 6 long and single ; 



air tube 3-4: 1.] Tree-hole breeders Orthopodomyia 21 



Anal segment without a median ventral brush, but with a pair of 

 ventrolateral tufts (fig. 24, C) ; air tube with scattered hairs or small 

 tufts. [Comb scales in a single row; antenna with a single or double 

 hair beyond middle.] Breed in water-holding plants Wyeomyia 61 



J)/r tube 



Dorsa/ 



preap/ca/ --- 



La f era/ cowb 

 T& M segment 



^4/7 a/ 



j/e/?fra/ 



/aferar/ 



Figure 24. — A, Posterior portion of abdomen of larva of Aedes vexans; B, anal 

 segment of larva of Aedes mitchellae; C, same of Wyeomyia mitchellii. 



