DIPTERA. 217 



Wheat-flies or CecidomyUes. Larva elongate, feeds on 

 the blossoms of wheat and other gram, the leaves of plants, 

 &c., causing excrescences. Pupa changes in the same 

 situation, in a tough case. Imago usually with moniliform 

 antennce, as long as the body, composed of about twelve 

 or thirteen joints in the female, and twice as many in the 

 male : maxillary feelers four-jointed ; Itgula short, obtuse, 

 and tomentose ; wings wide, as long as the body, which 

 they cover horizontally ; female furnished with a long ovi- 

 duct. Cecidomyia, Campylomyza. 



Crane-flies or Tipulites. Larva stout, very soft, attenu- 

 ated anteriorly, abruptly terminated posteriorly; feeds on the 

 roots of corn, grass, and other vegetables, or occasionally 

 on decayed wood. Pupa changes in the same situations ; 

 it has often tvvo remarkable recurved horns, porrected from 

 its head, through which it is said to breathe ; and the seg- 

 ments of the body are mostly armed with spines. Imago 

 with anteniKB thirteen to seventeen-jointed ; frequently 

 pectinated in the males ; ligula fleshy, bilobed, dilated ; 

 maxillary feelers five-jointed, curved, the points turning 

 outwards ; ocelli none. CtenopJiora, Pedieia, Tipula, Eri- 

 optera, Limnohia. 



Fungus-flies or Mycetophilites. Larva elongate, gla- 

 brous; feeds on decaying fungi. Pupa changes in the 

 same situations. Imago with antennce sixteen-jointed, 

 sometimes very long, moniliform, and simple in both sexes ; 

 ligula and other organs of the mouth obscurely developed 

 or obsolete ; ocelli three ; wings rather wide, covering the 

 body horizontally ; body very slender, the same length as 

 the wings ; legs long. Bolitophila, Macrocera, Synapha, 

 Mycetobia, Platyura, Sciophila, Leia, Mycetopliila, Molo- 

 hrus, Lestrema, Zygoneura. 



Rhyphites. Larva very elongate, smooth, cylindrical, 

 encompassed by eleven corneous shining rings ; head fur- 



