46 INSECTS.— GENUS CECIDOMYIA. 



slender, thighs fulvous at base, furnished at the tip with 

 several very acute cfaws. Poisers pale, nearly as long as 

 the thorax, with a suboval capitalum. Breast sometimes 

 fulvous. Abdomen brownish. 



Female. A?itenna longer than the thorax, the joints 

 somewhat oval, not separated by filaments. Abdomen 

 elongate-oval, above rectilinear, beneath somewhat ventri- 

 cose, fulvous, with a dorsal and ventral black vitta widely 

 interrupted by the sutures. Tail more or less acute in 

 the dead specimen in proportion as the oviduct is exserted. 

 Length rather more than three-twentieths of an inch. 



Eggs elongated, linear, pale, fulvous. 



Larva. -Sofi^^/ somewhat fusiform, whitish; tail^cuXtf 

 rather abruptly attenuated; head incurved, and attached 

 by the mouth; above hyaline, exhibiting an internal, ab- 

 breviated, visceral, green line; beneath with opaque white 

 clouds, which in the young animal are perfectly separate 

 and about nine on each side, with an intermediate series 

 of smaller ones; as the larva advances to its full stature, 

 these unite so as to exhibit the appearance of regular 

 transverse segments; near the anterior extremity are the 

 rudiments of feet resembling obsolete tubercules, or cre- 

 nulas; when taken from the culm it is almost inert, exhi- 

 biting very little motion to the eye. Length three- twen- 

 tieths of an inch, breadth one twentieth. 



Pupa — resembles the mature larva, but is of a dark 

 reddish brown colour; and appears perfectly inert. 



This well known destroyer of the wheat has received 

 the name of '' Hessian fly," in consequence of an errone- 

 ous supposition, that it was imported in some straw with 

 the Hessian troops during the revolutionary war. But the 

 truth is, it is absolutely unknown in Europe, and is a spe- 

 cies entirely new to the systems — being now for the first 

 time described. The insect described by Mr. Kirby in 

 the Trans. Lin. Soc. of Lond. vol. iv. p. 232, and named 

 by him Tipula Tritici, is without doubt of the same ge- 

 nus with this, but specifically distinct. 



