DIPTERA. 307 
Cuyuiza, Fall. Meig. 
Where they are rather shorter than the head, with the seta thick, 
and in the form of a stilet(1). 
The antennz of the others are always much shorter than the head, 
and usually projecting and distant; the palette, never much longer 
than it is wide, is sometimes almost ovoid, or bordering on an oval, 
and sometimes nearly globular. 
Some, in which the seta of the antenne 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 antennz more or less ovoid or oval. 
Such are the two following subgenera: 
Lissa, Meig. 
Where the top of the head presents a prominence, and the almost 
linear abdomen is not terminated by an articulated stilet(2). 
Psitomyia, Lat.—Psila, Meig. 
Where the body is proportionally less elongated and cylindrical, 
and the abdomen of the females terminates in an articulated stilet(3). 
To this subgenus may be united the Geomyze of Fallen(4). 
The Tetanura and Tanypeza of M. Meigen appear to approach 
the preceding subgenera. In both, however, the legs seem to be 
proportionally longer and more slender. The abdomen of the Teta- 
nure is obtuse and thickened at the end. 
_ The first exterior nervure of the wings is simple, and does not 
produce a stigmatiform cell; the exterior terminal cells are dis- 
tant(5). 
The abdomen of the female Tanypeza is terminated by a point or 
(1) Meigen. 
(2) Meigen. 
(3) See Meigen. Ihave changed the name of Psila, because it too nearly re- 
sembles that already given to a genus of the Hemiptera. 
(4) Fall., Dipt. 
(5) Meigen. 
