STATE AGRICULTURAL SOCIETY. 
535 
white color, and rather larger. Their transformations are like 
those of flies generally, the outer skin of the larva or maggot 
contracting and becoming dry and hard, and forming the case 
within which the insect lies in its pupa state. When the larva 
skin of this species is thus dried, with the pupa reposing within 
it, it appears as represented, plate 2, fig. 2, 2 a being a highly 
magnified view of its upper and 2 b of its under side. It is but 
the tenth of an inch long, and 0.03 in diameter; it is shining and 
of a pale yellow color, of an oval or rather an elliptical form, 
more rounded at the head and pointed at the opposite end, the 
segments distinctly marked by transverse constrictions. 
These flies appear much like the common house fly, reduced to 
an infantile size. I supposed they would prove to be one of the 
European species of Oscinis, until I came to examine them, 
when I found that, though they belong to the group Oscinides, 
they are generically distinct from both Chlorops and Oscinis, in 
having bristles or hairs-upon the face as well as upon the crown, 
and in having the two little transverse veinlets ot the wings sita- 
ated quite near the base. They thus pertain to the genus Jigromyza 
a name meaning field flies, as this genus is characterised by Mac- 
quart, and to his section AAA, and to his subsection DDD, but 
they are clearly distinct from either of the species which he de¬ 
scribes; nor am I aware that any of the members of this exten¬ 
sive genus have hitherto been noticed as depredators upon wheat, 
like their kindred of the genera Chlorops and Oscinis. The 
present species may therefore be designated 
The wheat mow fly, Jigromyza Tritici, (plate 2, fig. 1.) It is 0.08 in length, 
and to the tip of the closed wings 0.11. It is black, with a broad pale reddish yel¬ 
low band upon the front above the base of the antennae, and the mouth broadly 
margined with dull yellow. The legs are brownish black, the knees slightly marked 
with pale yellow. The wings arc notched on their outer margin near the base, at 
the apex of the first vein. The veinlets are situated near the base of the wing and 
near each other; and the inner middle vein is not prolonged beyond the second 
veinlct. 
In the same box in which these flies were hatched was found 
four individuals of a parasitic fly which had evidently come from 
some of the worms of the wheat mow fly. They pertain to the 
Family Proctrotrupida: of the Order Hymenoptera, and to the 
genus Diapria. They may therefore be named 
The WHEAT MOW fly’s parasite, Diapria Jgromyza. They measure 0.06 in 
length, and to the tip of the closed wings 0.08. They are black and shining, with shanks 
