DIPTERA. 361 
Sromoxys, Geoff:, Fab. *, 
Where the proboscis is only geniculate near its base, and then ad- 
vances directly forwards. 
C. ealcitrans, L.; De Geer, Insect., VI, iv. 12, 13. Seta of 
the antenne pilose; body cinereous-grey spotted with black ; 
proboscis shorter than the body. It bites our legs severely, 
particularly on the approach of rain f. 
Bucentes, Lat.—Sromoxys, Fab.—Siruona, Meig., 
Where the proboscis is bi-geniculate as in Myopa f. 
The genus Carnus of professor Nitzsch—Insect. Epiz., Magas 
der Entom., of Germar—which he refers to our family of the Co- 
nopsarize is distinguished from the preceding ones in the presence of 
rudiments of wings. The species which serves as its type is figured 
by M. Germar in his Faun., Insect. Eur., fasc. LX, tap. 24. 
The direction of its proboscis, the form of its antenne, and that of 
its body, seem to indicate its proximity to Stomoxys. 
Our fourth and last tribe, that of the Muscies, is distinguished 
from the three preceding ones by a very apparent, always membra- 
nous and bilabiate proboscis, usually bearing two palpi (the Phore 
alone excepted ), susceptible of being entirely retracted within the oral 
cavity; and by a sucker composed of two pieces. The antenne always 
terminate en pallette with a lateral seta. These Athericera embrace 
the old genus Musca of Fabricius, which the labours of Messrs. Fallen 
and Meigen, without mentioning our own, have greatly modified. 
All the difficulties however which beset its study are far from being 
removed; for although those gentlemen have established a great num- 
ber of new genera, there are still some, Tachina and Anthomyia, for 
instance, which can only be considered as general repositories. In 
the work of Meigen, which is whelly restricted to the Diptera of Eu- 
rope, the first of these genera is composed of three hundred and fifteen 
species, and the second of two hundred and thirteen. Dr. Robineau 
Desvoidy, wishing to complete these researches, and to meet the de- 
mands of the science, has devoted himself with much zeal to the spe- 
cial of the Muscides, which he calls Miodares; and the Memoir on this 
subject, which he presented to the Royal Academy of Sciences, 
has been deemed worthy of insertion among those of that institution ; 
but as that paper is not completed, and as we are only acquainted with 
* MM. Lepeletier and Serville—Encye. Méthod., X, 500—have formed a new 
genus PROSENA, which they have separated from the preceding one, on account of 
its much longer proboscis—four times the length of the head—and the seta of the 
antennex, which is bearded on both sides, 
+ Fab., Lat., Meig., Fall., &c. 
¢ Lat., Gener. Crust. et Insect., 1V, 359; Meig., Dipt., xxxvii, 18, 25. 
VOL,.IV., BR 
