DIPTKRA. 373 



and usually projecting and distant; the palette, never mucl» longer 

 than it is wide, is sometimes nlmost ovoid, or bordering on an oval, 

 and sometimes nearly globular. 



Some, in which the seta of the antennae is usually pilose, have 

 the narrow and elongated body of the preceding ones ; the abdomen of 

 several also terminates in a point or stilet. 



Of these Muscides,some have a naked face, and the palette of their 

 antennae more or less ovoid or oval. 



Such are the two following subgenera : 

 LissA, Meifj., 

 Where the top of the head presents a prominence, and the almost 

 linear abdomen is not terminated by an articulated stilet*. 



PsiLOMYIA, Lat. — PsiLA, Mei(]., 

 Where the body, is proportionally less elongated and cylindrical 

 and the abdomen of the females terminates in an articulated stiletf. 



To this subgenus may be united the Geomyxce of Fallen :|:. 



The Tefamim and Tamjpeza of M. Meigen appear to approach the 

 preceding svdjgenera. In both, however, the legs seem to be pro- 

 portionally longer and more slender. The abdomen of the Tetanuroe 

 is obtuse and thickened at the end. 



The first exterior nervure of the wings is simple, and does not pro- 

 duce a stigmatiform cell ; the exterior terminal cells are distant^. 



The abdomen of the female Tanypeza is terminated by a point or 

 stilet. The first terminal cell, that which comes after the cubital, 

 is almost closed at the end, or forms a narrow, elongated, and trun- 

 cated triangle. I suspect that this subgenus belongs to the division of 

 the DoHchopoda\\. 



In others, the sides of the face are furnished with hairs ; the first 

 joint of their antennae is much more slender than the following ones, 

 almost cylindrical, and somewhat thickened at the end ; the two fol- 

 lowing ones form a small rounded club. 



Lonchoptera., Meig. — Dipsa, Fall., 

 Where the ocelli are placed on an eminence. The wings are long 

 and exhibit no transverse nervure beyond their base ; the third longi- 

 tudinal, nervure, from the exterior margin, is bifurcated. This sub- 

 genus is far removed from the Dolichopoda, near which Meigen has 

 placed it^. 



The body of the other Scatomyzides is thicker and less oblong, ap- 

 proaching more to the form of that of the common Fly. 



One single subgenus, as the 



Heleomyza, Fall., 

 Presents mustachios **. 



* Meigen. 



f See Meigen. I have changed the name of Psila, because it too nearly re- 

 sembles that already given to a genus of the Hemiptera. 



X Fall., Dipt. 



§ Meigen. 



II Idem. For the genus of Tefanops, which in some respects seams to belong to this 

 division, see that of the Carpophila. 



^ See Meigen. 



** Fiill., Dipt. : the Mouche dcs latrines {Musca serratu, L.) of De Geer, which is 



