CLASSIFICATION OF INSECTS. 191 



insects ; black, brown, or fulvous. Hemerodromia, 

 Tachydromia, Platypalpus, Drapetis, Lonchoptera. 

 682. Silvery flies (Dolichopites). Larva atte- 

 nuate at the extremities, elongate ; inhabits moist 

 earth and mud. Pupa changes in the same situ- 

 ations. Imago with the antennae five-jointed ; 

 the basal, second, and third joints robust, the 

 fourth and fifth forming a seta ; ligula very stout, 

 short, and bilobed ; ocelli three ; wings very large, 

 lying horizontally over the body ; alulae obsolete ; 

 legs very long ; body short and small ; green, 

 with a silvery pilosity. Frequents damp places, 

 preying upon small insects. Porphyrops, Chry- 

 sotus, Dolichopus, Medeterus. 



683. Wood-eating flies (Xylophagites). Larva 

 elongate, inhabits decaying wood. Pupa changes 

 in the same situations : in a cocoon. Imago with 

 the antennae ten-jointed ; the basal and second 

 joint are short, moderately robust, and hairy ; the 

 portion corresponding to the apical seta of the 

 Muscina is robust, and composed of eight distinct 

 joints ; ligula large, fleshy, and pilose ; ocelli 

 three ; wings horizontally covering the body ; 

 alulae none ; hind tarsi often dilated in the males 5 

 body linear, very depressed. Xylophagus, Actina, 

 Beris. 



684. Chameleon flies (Stratiomites). Larva 

 very elongate, attenuated at the anterior end, 

 composed of twelve very distinct segments, be- 

 sides the head ; posterior extremity radiated ; 



