86 PRIZE essay: 



midge (Cecidoinyia Tritici) occupy two-thirds of the entire 

 head.(i) 





WHEAT MIDGE. J I ^ / ^V^^ ' 



(Nat. Size.) ^y^ \ i / ^^^ (fig. A.) 



Part of a Female 

 Antenna, 



\ 



FIG. I. — MAGNIFIED CLEAE-WINGED WIIEAT MIDGE.— (Cecidowjya trUici.) 



They are large, of a deep black colour, and are separated from 

 each other on the top of the head only by a light and almost im- 

 perceptible cleft, so that when viewed in front they appear like a 

 continuous broad black band surrounding the head. The face is 

 pale yellow. The antennse are of a deep brown or black colour, 

 less intense than the eyes, of the same length as the body and 

 composed of twelve joints. Each joint (Fig. h) is commonly 

 oblong, with a contraction in its middle, and is surrounded with 

 a row of hairs near its base, and another near its apex. The 

 joints of the antennse are connected by a slender thread. The 

 thorax is of a pale yellow colour ; the abdomen throughout of 

 an orange colour ; the wings are colourless, appearing like thin 

 plates of mica. Their margins are densely ciliated with hairs. 

 The legs are pale yellow ; the basal joint of the tarsi is the 

 shortest of all, its length Uttle exceeding its diameter. All parts 

 of the body are clothed with minute hairs. 



(] ) For a full and complete technical description of the AVheat Fly, or Midge, 

 see Dr. Fitch's Report, in Vol. V. Trans. T^. Y. S. A. S., 1845. Many scientific terms 

 are omitted in the text, for obvious reasons. 



