354 INSECTA, 
Curysoroxum, Meig.—Muuio, Fab., 
Where the seta is also inserted on the third joint, but near its base ; 
this joint is the longest of all, and forms a narrow and elongated 
triangle ; the two others are almost of equal length. The wings are 
distant *. 
Sometimes the seta, always thick and in the form of a stilet, ter- 
minates the antenne. 
Certs, Fab. 
Where the body is oval, elongated, and resembles that of a Wasp; 
the second joint of the antennz is of equal length with the last, and 
forms with it a fusiform club with a very short stilet. The abdomen 
is long and cylindrical. The wings are very remote, and.the.exte- 
rior cell of the posterior margin has a well-marked re-entering angle 
in the outer edge f. 
CauucerA, Meigq., 
Where the body, shorter, wider and silky, has the general appearance 
of that of the common Fly. The second joint of the antenne, 
shorter than the last, forms with it an elongated, compressed, fusiferm 
and slightly arcuated club; the seta is in the form of an elongated 
stilet; the first joint is longer than the following one. The exterior 
cell of the posterior margin exhibits no emargination in its sides f. 
The nasal tubercle which distinguishes the preceding Syrphide, 
disappears in the following ones. The seta of the antennz is almost 
always simple, The wings are incumbent, one on the other. 
The first are connected with the preceding ones by the length of 
their antenne. Those organs are closely approximated at base; the 
second joints, the shortest of all, forms, with the third, a narrow and 
elongated club; the seta is simple and inserted near the base of the 
latter. 
Crraropuyas, Wied. 
Scutellum unarmed ; third joint of the antenne nearly twice the 
length of the first §. 
Aruritis, Lat.—Mouio, Fab.—Microvon, Meigq., 
Where the scutellum presents two teeth; the first joint of the an- 
tennz is almost as long as the two following ones taken together. 
In this and the precedin® subgenus, as in Ascia, the two first 
closed cells of the posterior edge are terminated in the manner of an 
angle |]. 
iy ee of the following Syrphide are shorter than the head. 
The posterior legs are often large, particularly in one of the sexes. 
Sometimes the pallet of the antennz is oblong and almost in the 
form of an elongated tridngle. The posterior thighs are thick and 
dentated. The wings are incumbent, one on the other. 
* See Latreille and Meigen. 
+ See Fab., Lat., Meig., and Wiedemann. 
+ See Lat., Meig. 
§ Wied., Anal., Entom., fig. 9. 
|| See Lat., Gen. Crust. et Insect., 1V, 329; Meig. and Fallen. 
