DIPTERA. 255 
two others which are posterior; the proboscis is concealed. The 
wings exhibit more nervures than those of the preceding subge- 
nus(1). 
There, the head is proportionally shorter, almost hemispherical, 
and compressed transversely; the antenne are very distant; the 
trunk is longer than the head; the palpi are sometimes exterior, and 
the extremity of the wings frequently exhibits a reticulation analo- 
gous to that of the same organs in the Neuroptera. 
Those, in which they are always reticulated in the usual manner, 
where the proboscis is merely a little longer than the head, and the 
palpi are not apparent, where the first joint of the antennz is cylin- 
drical, somewhat longer than the preceding one, and the last forms 
an elongated cone, compose the subgenus 
Muto, Lat. Meig.—Cytherea, Fab.(2) 
Those, in which the summit of the wings is most frequently reti- 
culated like those of the Neuroptera, and the proboscis is much 
longer than the head, with the palpi external, in which the two first 
joints of the antenne are very short, nearly equal in size, almost 
granose, and the last forming a very short cone, with an abrupt and 
almost setaceous stilet at the extremity, constitute the subgenus 
NeEMEsTRINA, Lat. Oliv. Wied. 
Where the tarsi are furnished with three pellets, whilst in the pre- 
ceding subgenera there are only two, and frequently but slightly 
apparent(3). 
Two species, one of which—-Cytherea fasciata, Fab.—is found 
in Italy and in ci-devant Provence, differ but little as to the 
reticulation of their wings from the Anthraces. They form the 
genus Farrenia of MM. Meigen and Wiedemann. According 
to them, the proboscis is susceptible of being curved beneath 
and along the pectus(4). 
The genus Corax of Wiedemann—Anal. Entom., xviii, fig. 8— 
in general appearance, antenne and wings, appears to us to approxi- 
(1) See Meigen. 
(2) Lat., Meig., Fab., Wied. 
(3) The Hirmoneurz should be excepted, according to a figure of one of the 
tarsi given by Meigen. 
(4) See the authors already quoted, and the Encyc. Méthod., article Wémes- 
trine. 
