DIPTERA. " 379 



fectly sound and ripe lemons, on account of the abundance of 

 a dipterous Insect of the same genus, wliich deposits its eg^s in 

 them*. 



Sometimes the head is most compressed transversely, so that its 

 superior plane is more inclined than in the preceding species, and the 

 antennae, when viewed in profile, appear to be inserted near the 

 middle of the face. The proboscis is very thick and partly salient. 

 The wings are separated horizontally, and the abdomen presents 

 exteriorly but four segments. 



Platystoma, Mei(j. — Dictya, Fab.\ 



This last subgenus manifestly leads us to the Timi<x of Wiede- 

 mann, closely approximating itself to our MoieV^w* and Lauxania, and 

 to some other subgenera of M. Meigen. 



They will close our eight division, that of the Gymnomyzides. 

 These Muscides are small, with a short, thick, arcuated and almost 

 glabrous body of a glossy-black colour. Their head is strongly com- 

 pressed transversely, like that of the Platystomse, is of a uniform 

 colour, generally that of the body, without any projection inferiorly, 

 and with a large oval aperture. The wings are incumbent on the 

 body, and extend beyond it posteriorly ; the scutellum projects ; the 

 abdomen is depressed, short, and terminated in some by a little point 

 in the form of a stilet ; the legs are almost glabrous or but scarcely 

 pilose. 



In some, the attennae are almost as long as the head, and distant. 



Celyphus, Dalm. 



Easily distinguished from all other Diptera by the scutellum, which 

 covers the whole back of the abdomen, as in Scutellera. 



C. ohtectus, Dalm., Anal, Entom. The only species known. 

 From Java. 



Lauxania, Lai., Fab., Meig., 

 Wliere the scutellum is of an ordinary size, and the antennae have a 

 plumous seta J. 



The others have attennae shorter than the head. 



Here, they are always very short, inserted beneath a sort of arch 

 that traverses the face, and very distant; the first cell of the posterior 

 edge of the wings, or that which directly follows the cubital, is most 

 frequently closed. The antennae are lodged in fossulae, and the space 

 between them is elevated. The front is frequently punctured. 



Those species, in which the first cell of the posterior edge is almost 

 closed, form, in the system of Meigen, two genera. His Timiae 

 (Timia), in which, according to him, the abdomen exhibits six an- 

 nuli, and the palette of the antennae is short and almost semi-ovoid ; 

 and his Ulidias (Ulidia), where it is more elongated, almost ellipti- 

 cal, and where the abdomen presents but five rings. M. Fallen had 



* See Meigen. 



t Iilein. 



X Lat. Geiier. Crust, et Insect., IV, 357 ; Fab., and Meigen. The latter unites 

 some species with it, in which the attenns are shorter, that might form a separate 

 subgenus. 



c c2 



