376 INSECTS. 



2. Costal vein attenuated round tip of wing. 

 * Veins in last subdivisions not more than 



six. 



Cecidomyzidae. 



** Veins in last subdivision more than six. 

 Culicidae Gnats, Mosquitoes (Hind-margin 



fringed with scales.) 

 Heteroclitse. (Hind-margin fringed with 



hairs.) 



Phlebotomidae. (Wings ovate, or lanceo- 

 late ; deflexed or divaricated.) 

 c. Middle segment of thorax with an angular, 

 transverse seam. 



Tipulidae Daddy Longlegs, &c. 



SUBSECTION II. BR ACHY CERA. 



Antennae of three distinct joints, from the third of which 

 springs a bristle ; or from three to ten joints, which, 

 after the third, are fused together, or suddenly 

 become abruptly slender. 



Wings ; anal areolet closed. 



Figure usually stouter than in Nemocera. 



Families : 



a. Cubital vein forked ;f anal areolet tapering nearly 

 or quite to hind-margin. 



1. Costal vein ending with tip of wing. 



Stratiomidae. (Soldier-Jlies.) Antennae five 

 to ten joints, conical at tip, or terminating 

 in long style or short bristle. 

 Scenopinidae. Antennae three-jointed, spin- 

 dle-shaped ; third joint large and long. 



t la Empis the cubital vein is sometimes forked, sometimes simple ; 

 the anal aveolet not reaching near hind margin. 



