238 Rev. Mr. Kirsy’s Hiflory of 
rate of not quite two and a half grains to an eat; andin twenty ears 
of red wheat, twenty-nine grains were deftroyed, which is nearly 
at the rate of one and a half grains to an ear. ‘Take the whole)to+ 
gether, andthe proportion will be about two grains in an ear, which 
Ifuppofe may be about .a twentieth part of the produce, and would 
make a difference of at leaft five coomb in the crop in this field. 
‘The white wheat in this inftance was.moft expofed,to the attack of 
the infeé;—whether this be generally the cafe, muft be, determined 
by ‘future experiments upon a more extenfive feale. | Leaft mifchief 
feemed to be done on the South fide of the North hedge; but no 
part efcaped wholly—not an ear 1examined but what had fuftained 
fome injury. From the field thatiI have, been {peaking of I went 
to another, which was fown later.in the Autumn: in this I found 
fcarcely any of the larvae; but it was very much infefted:'by the 
Aphis, called in Mr. Markwick’s letter above-mentioned the Dol- 
phin*.. The fame fpecies of 4phis is fufficiently common: upon 
barley and oats, as well as wheat : I found.very few of thefe in the 
firtt field. The red gum, which is undoubtedly a kind. of Fungus, 
appears to me totally unconnected with the infects that infeft the 
wheat: in the field where I found an infinity of the larvae 
of the Zipula Tritici, and Thrips phyfapus, 1 a found wsined 
* Poffibly this may be the Aphis Avene of Fabricius: but as ais Las) given no apres 
of it, I cannot be pofitive ; I fhall therefore defcribe it under the. name of 
A. granaria, viridis, cauda bifeta, fetis geniculifque pedum nigris, 
Aphis avenz. Fab. Sp. Inf. ti. p. 386. n. 17. Gmel. tom. I. parts iv. P- 2206. 
n. 52. Vill. Ent. Eur. 1. p. 551. n. 50? 
Caput flavidum uti antennarum articulus primus. Ocul: nh. Aldomen cbovatum 
cauda aculeata. Pedes lividi, tarfis geniculifque nigris. ' 
Habitat in tritici et hordei {picis, aveneque paniculis. 
florets 
