28 
The tees are whitish or very pale yellow, long and slender, of a 
cylindrical form, and of nearly the same diameter through their en- 
tire length. The coxe (small joints by which the femurs are con- 
nected with the sternum), as they are directed more or less back- 
wards, vary the point from which the legs seem to arise in different 
specimens when viewed from above. The femurs, tibiw, and second 
joint of the tarsi, are all of about the same length. The third, fourth, 
" and fifth joints of the tarsi (Plate 5, fig. g), are successively shorter ; 
whilst the basal joint is the shortest of all, its length little exceeding 
its diameter. 
All parts of the body and limbs are clothed with minute, slender, 
longish hairs. 
The mate differs so remarkably in its aspect from the female, 
and is moreover so rare an insect, that it has generally escaped the 
researches of observers. It would appear from Mr. Curtis’s paper, 
that Meigen is the only one who has identified and given a descrip- 
tion of this sex ; and I should distrust my having any specimens of 
it, but that one of the flies hatched from the larve already spoken 
of as gathered in a wheat-field early in the spring, is a male (Plate 
5, fig. 4); and a few of my other specimens manifestly coincide 
with this. In these the antennae are at least double the length of the 
body, and composed of twenty-four joints of a very exact globular 
form (Plate 5, fig. e); each joint encircled with a single row of 
hairs, and separated widely from its fellows, the thread between 
being of about twice the length of the joint itself. The abdomen, in- 
stead of being of an ovate form, as in the female, is broadest at the 
base, and thence tapers gradually, though slightly, towards the 
apex ; the terminal segment, however, being broader than the one 
or two preceding it, and of a reniform shape, with the lobes directed 
backwards. The male is also somewhat smaller in size: in all its 
other marks, it appears to correspond with the female. 
Among the hosts of specimens of the female that may be met 
with, there will occur considerable variations in size, color, and 
some minor particulars. The common length, to the tip of the ab- 
domen, is the twelfth of an inch, or slightly under this ; yet I have 
measured recent specimens from the wheat-field, that were but half 
this size. The color seems to be more uniform in specimens taken 
from the wheat-field, than in those procured in other situations. It is 
of a lively orange-red, particularly upon the abdomen, where the 
