DIPTERA. 27 ts 
At the beginning of these species we will place those whose an- 
tennz, 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 nests 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. 
Vouuceiia, Geoff. Lat. Meig. Fab. 
Where the third joint of the antennz or the palette is oblong; its 
contour forms a curvilinear and elongated triangle. 
V. mystaceas; 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 
mammillz, each furnished with three long hooks which enable 
it to crawl. Here also comes the 
M. & zones, Geoff.; Syrphus inanis, Fab.; Panz., Faun. 
Insect. Germ., I], 6. Eight lines long; but slightly pilose; 
fulvous; head yellows two black bands on the abdomen. Its 
larva also lives in the nest of the Bombi(1). 
Sericomyia, Meig. Lat.—Syrphus, Fab. 
Where the palette of the antennz is*semi-orbicular(2). 
Erisrauis, Meig. 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 mar- 
gin, that which is situated near the angle of the summit, has a deep 
(1) For the other species, see Lat., Meig., Fab. and Fallen. 
(2) The same authors, 
