DIPTERA. 351 
Then comes Syrphide, in which the fore-part of the head, a little 
above the superior margin of the oral cavity, or near the origin of 
the snout, presents a prominence. 
At the beginning of these species we will place those whose an- 
tenn, always shorter than the head, are furnished with a plumous 
seta. 
Their body is short, and frequently pilose, and the wings are dis- 
tant. At the first glance these Insects resemble Bombi, and as the 
larve of several inhabit the nest of those Hymenoptera, it seems as if 
the Author of nature clothed them in a similar manner, in order that 
they might penetrate into their habitations without danger. 
The Syrphide compose three subgenera. 
Vo.ucetia, Geoff., Lat., Meig., Fab., 
Where the third joint of the antenne or the palette is oblong; its 
contour forms a curvilinear and elongated triangle. 
V. mystacea; Musca mystacea, L.; V. bourdon, De Geer, In- 
sect. VI. viii, 2. Black, and densely pilose ; thorax and extre- 
mity of the abdomen covered with fulvous hairs; origin of the 
wings fulvous. 
The larva inhabits the nests of Bombi. Its body is widened 
from before posteriorly, is transversely rugose, has little points 
on the sides, six membranous radiating threads at the posterior 
extremity, and presents above, two stigmata and six pairs of 
mammille, each furnished with three long hooks, which enable it 
to crawl. Here also comes the 
M. a4 zones, Geoff.; Syrphus inanis, Fab.; Panz., Faun. In- 
sect. Germ., II, 6. Eight lines long; but slightly pilose; ful- 
vous.; head yellow; two black bands on the abdomen. Its 
larve also lives in the nest of the Bombi *. 
SericomyiA, Meig., Lat.—Syrruvs, Fab., 
Where the palette of the antennez is semi-orbicular ft. 
Erisrauis, Meiq., Fab., 
Which (restricting the subgenus to those species where the seta of 
the antenne is evidently hairy) only differs from Sericomyia in the 
wings. Here the exterior and closed cell of the posterior margin, 
that which is situated near the angle of the summit, has a deep 
rounded emargination in the external side; in the preceding subge- 
nus it is straight f. 
To these succeed other subgenera very analogous by the short 
form of the body, the triangular abdomen and by the antenne, much 
shorter than the head, but where the setais simple or without very 
apparent hairs. 
In some, as in Eristalis, the external margin of the last external 
* For the other species, see Lat., Meig., and Fallen. 
+ The same authors. 
~ The E. intricarius, similis, alpinus, Meig. 
