250 INSECTA. 
clined on each side of the body; and the alule very large and cover- 
ing the halteres; the head is small and globular, the thorax very 
high or gibbous, the abdomen vesicular and rounded, or almost 
cubical; the antenne are closely approximated, and the proboscis is 
directed backwards or wanting. 
Those which have the proboscis prolonged backwards form two 
subgenera. In the first, 
Cyrrtus, Lat. 
Or Cyrtus properly so called, the antennz are very small and 
consist of two joints, the last with a terminal seta. In the second, or 
Panors, Lam. 
The antenne are longer than the head, almost cylindrical, tri- 
articulated and without a terminal seta. 
In the remaining Cyrti the proboscis is not remarkable. 
AsToMELLA, Dufour. 
Distinguished by the antenne, composed of three joints, the last 
of which forms an elongated and compressed button without a seta. 
Henops, Illig.—Ogcodes, Lat. 
The antenne very small, biarticulated, with a terminal seta and 
inserted in front of the head. 
Aorocera, Meig. 
Similar antennz inserted on the anterior part of the head(1). 
Bompytius, Lin.—Bombyliers, 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 antenne are closely approximated, and 
(1) See Lam., Ann. du Mus. d’Hist. Nat., III, p. 263, xxii, 3; Lat., Gen. Crust. 
et Insect., IV, p. 315, et seq.; the Encyc. Méthod., articles Ogcodes and Panops; 
Meigen and Fabricius. For the genus Astomella, see the Dict. Class, d’Hist. Nat. 
