80 
CORN AND GRASS. 
Diseases Committee of the Boyal Agricultural Society), which he had 
received from Dr. Fream, of the College of Agriculture, Downton. 
The specimens from which these were taken, Mr. Whitehead 
informed me, were sent to him about the middle of April, and from 
them one of the perfect “ Gout Flies” emerged on May 11th. This 
first specimen Mr. Whitehead placed in my hands, and as there were 
points about it which made me hesitate as to whether it could with 
absolute certainty be considered the common kind of Gout Fly known 
as Chlorops tamo pus, and also it was found in Wheat (which with us is 
less commonly infested than Barley), I submitted the specimen to Mr. 
Meade, of Bradford, who was good enough to examine it, and replied 
as follows :—“ I believe your Chlorops to be a female of taniopus; it is 
not lineata. I thought at first that it might be C. nasuta, which is a 
very variable species, but upon close examination I feel convinced that 
it is a variety of C. taniopus." 
Of the other specimens sent me, one chrysalis case had fallen from 
the plant, so that I could examine it, and I did not observe any differ¬ 
ence between this and the common form of Gout Fly chrysalids, and 
within it the fly was so far advanced that its shape was clearly distin¬ 
guishable. Another chrysalis was low down in the centre of the little 
plant, of which I noticed that one at least of the leaves was much 
wider than in natural circumstances. 
This observation is of interest as showing that the winter form of 
attack is to a certain extent present here ; but until we know more 
about its prevalence, and especially whether it may commonly be found 
in Wheat, we can hardly utilise it practically. 
It may be useful, however, to give a short description by which the 
maggots of three different kinds of flies, all of which do mischief very 
much in the same way in their method of winter attack within the 
shoots of young winter Corn (that is, independently of their summer 
method of attack), may be distinguished from one another. 
These are the maggots or larva of the Gout Fly or Bibbon-footed 
Corn Fly (Chlorops taniopus ), the Frit Fly (Oscinis frit), and the Wheat- 
bulb Fly (Hylemyia coarctata). 
These maggots all resemble each other in being whitish or yellowish 
in colour, legless, cylindrical in general shape, but somewhat tapering 
towards the head end which contains the mouth hooks, and blunt at 
the tail extremity. 
The maggots of the Gout and Wheat-bulb Fly may be generally 
described as about the fifth of an inch in length when full-grown ; 
those of the Frit Fly are smaller. 
The main differences between these kinds of maggots, as seen with 
a tolerably strong magnifier, are as follows:— 
The maggot of the “ Gout Fly ” has two spiracles, projecting like 
