ase INSECTA, 
the antennz are closely approximated, and the proboscis is directed 
backwards, or wanting. 
Those which have the proboscis prolonged backwards form two 
subgenera. Jn the first, 
Cyrtus, Lat., 
Or Cyrtus properly so called, the antenne are very small and consist 
of two joints, the last with a terminal seta. In the second, or 
Panops, Lam., 
The antenne are longer than the head, almost cylindrical, triarticu- 
lated, and without a terminal seta. 
In the remaining Cyrti the proboscis is not remarkable. 
AstomE.Lua, Dufour., 
Distinguished by the antenne, composed of three joints, the last of 
which forms an elongated and compressed button without a seta. 
Henoprs, I/lig—Occopns, Lat. 
The antenne very small, biarticulated, with a terminal seta and 
inserted in front of the head. 
Acrocera, Meig. 
Similar antenne inserted on the anterior part of the head *. 
Bompy.ius, Lin.—Bompytizrs, Lat., 
Where the wings are extended horizontally on each side of the body, 
and the halteres are exposed. ‘The thorax is higher than the head, 
or gibbous as in Cyrtus; the antennez are closely approximated, and 
the abdomen is triangular or conical; the proboscis is directed for- 
wards. 
Their antenne always consist of three joints, the last elongated, 
almost fusiform and compressed, truncated or obtuse, usually ter- 
minated by a very short stilet, and never by an elongated seta. The 
palpi are small, slender,and filiform. The proboscis is generally 
very long and most slender at the extremity. Their legs are long 
and attenuated. ‘They fly with great velocity, hover over flowers 
without alighting on them, introduce their trunk into their calyx to 
obtain their nectar, and produce a sharp humming sound. I sus- 
pect that their larvee are parasitica] as well as those of the following 
genus. 
In some the proboscis is evidently longer than the head, very 
slender, and tapers to a point. 
Toxopuora, Meigq. 
Removed from all the others by the antennz, which are as long as 
the head and thorax, projecting, filiform, and terminating in a point, 
and of which the first joint is much longer than the rest. The body 
is elongated +. 
* See Lam., Ann. du Mus. d’Hist. Nat., III, p. 263, xxii, 3; Lat., Gen. Crust. 
et Insect., IV, p. 315, et seq.; the Encye. Méthod., articles Ogcodes and Panops ; 
Meigen and Fabricius. For the genus Astomella, see the Dict. Class. d’Hist. Nat. 
+ See Meigen; his T. maculatus had been described and figured by Villers, in his 
Entom. d’Europ. III., x, 31. Asilus fasciculatus. See also Wied., Dipt. Exot. 
