affecting the Corn- Crops. 
489 
and worthless grains called Frits, which are the greatest loss to 
husbandmen;" and he calculates the annual loss in Sweden at 
iipwards of 100,000 golden ducats,* about the same sum in pounds 
sterling — an immense loss, if we consider the period at which 
Linnaeus wrote and the country he alluded to. It is found much 
farther to the north, the fly being, according to Zotterstcdt, abun- 
dant everywhere in Lapland, on grass in arid situations, from the 
5th of July to the 2nd of September.! 
I will now describe the first species which came under my own 
observation, and causes the disease termed in Oxfordshire the gout 
in wheat and barley, from the stalk being swollen to thrice its 
natural size. These flies belong to the Order Diptera, the 
Family Muscid/E, and this species to the Genus Chlorops, so 
called from its green eyes, and it is named by Meigen 
12. C. tseniopus,J the ribbon-footed corn-fly (fig. 20, pi. L). 
Guerin considers this to be a variety of the following insects, 
which belong to tlie same species : — 
Musca lineata. Fab. : Ent. Syst., v. 4, p. 356, No. 180.— Oscinis 
lineata. Fab. : Syst. Ant., p. 215, No. 4. 
Oscinis lineata, Lat, : in Ency. Method., v. 8, p. 566. 
Chlorops nasuta, Meig. : Syst. Besch., v. 6, p. 142, not of 
Gmelin. 
Chlorops glabra, Westw. : in Gardener's Mag., v. 1.3, p. 289. 
It is of a straw-colour or pale yellow ; the antenna? are porrected 
but drooping, black, small, compressed, and four-jointed ; the basal 
joint being cup-shaped and bristly ; second nearly orbicular ; the 
third minute, short, and slender, inserted near the base of the 
second; the fourth a fine, rather short bristle, often placed at an 
angle with the third (fig. /) : head rather large and hemispherical 
(fig. 22); face smooth; profile concave (fig. w) ; mouth received 
into a cavity beneath, composed of a bilohed lip, two palpi, a 
labrum, and tongue; at the base of the crown is a olack triangle, 
on which are placed in triangle the three minute ocelli ; the eyes 
are lateral and oibicular, remote in both sexes, green when alive, 
blackish or brown after death; thorax ovate-quadrate, very con- 
vex, and as broad as the head ; down the back are three broad 
black stripes, the centre one equal, the lateral ones tapering 
behind ; on each side of these is a slender short black line, not 
extending to ihe shoulder, and there is a black dot on the side of 
the breast ; the scutellum is semicircular and yellow, with a 
minute dark spot on each side under the margin at the base, 
sometimes there are two rusty converging stripes on tVie sides, and 
* Linn.TGus's Systema Naturae, pars 2, p. !)94, No. 00. 
t Insecta Lapponica, col. 781, No. 12. 
X Syst. Besch., v. G, p. 144, No. 9. 
