Tipula Tritici; and Icbneumon Tipula. 233 
it 1s fingular that this fpecies of Tipula, which muft neceffarily 
be very common, fhould never: have been noticed. So often as 4 
have been, and at all times, in the corn-fields, with my attention 
always awake to entomological fubjeéts, I do not recollect ever fee~ 
ing it before. Since J loft it, I have fearched for it in a field where 
I found the larve in the greateft plenty; I have examined the 
barn where the corn from that field was laid up; and in both in- 
ftances was equally unfuccefsful. | From thefe circumftances it feems 
probable, that although one or two might be difclofed with me, 
by being placed in a fituation where the fun fhone upon them, 
fooner than their natural feafon, yet that in general the fly does 
not make its appearance until the Spring, fo as to be in readi- 
nefs to depofit its eggs in the wheat, when it has made fo much 
progrefs in growth, that the larva may be hatched about the time 
of its going into bloffom. And I am confirmed in this opinion by 
another circumftance: A few days fince, with a fine needle, I care- 
fully took off the thin membrane from two of the pupz which I 
had referved, that I might fee how near they were to a change of 
ftate ; but inftead of difcovering the lineaments of the future fly, the 
infe& was ftill in the form of the larva*: fo that probably the 
pupa is not ufually complete until the Spring, and the infect inclofes 
itfelf ina thin membrane to protect itfelf from the cold of the 
Winter. - salt 
L obferved above, that the pupe which I met with bore no pro- 
portion in number tothe /arve, Ihave feen more than once feven 
or eight florets in an ear inhabited by the latter, and fometimes fo 
‘many. as thirty in a fingle floret, feldom Jefs than eight or nine, and 
* Tt may be objeéted that this was probably the larva of the Jchnewmon, which had 
devoured that of the Tipu/a. To this I reply, that it was in colour, form, and in'every 
refpe&t forexaétly fimilar to the latter that it could be no other. 
Vor. IV. Hh yet 
