504 
Observations on the vanotis Insects 
Mr. iSIarkwick, whom we have so frequentlj- mentioned, found the 
Aphides, or Dolphins as they are called in some counties, infest- 
ing the wheat-ears the second week of July, 1/97. Mr. Kirby 
also reported this Aphis to be sufficiently common upon barley 
and oats as well as wheat in the same year; and as Fabricius has 
given no description of his Aphis avencc, which is possibly the same 
species, Mr. Kirby was constrained in describing it to designate 
it by a new name.* This insect belongs to the Order Homoptera, 
the Family Aphidiid.e, the Genus Aphis, and the species is 
called 
6. A. granaria : it is green when alive, changing to an olive 
ochraceous or brown colour when dead : the antennee are very 
slender and tapering, as long as the body, inserted close to the 
inner margin of the eyes, in front of the face, composed of seven 
black joints, more or less ochreous at the base : first joint stout 
and ovate ; second, subglobose ; third, very long ; fourth and 
fifth, decreasing in length; sixth, not longer tJian the first; 
seventh, very slender, and as long as the third : head fixed, small, 
transverse-oval ; eyes lateral, remote, dark and globose ; ocelli 
three, forming a large triangle, one being placed near the inner 
margin of each eye, the third upon the anterior margin of the 
forehead : trophi forming the rostrum or mouth arising at the 
lower part of the face, between the anterior coxae; under lip not 
much longer than the head, four-jointed, pointed, black, ocin-eous 
at the base, inclosins: two maxillae and two mandibles, which form 
an exceedingly slender, horny, long tongue : thorax moderately 
large, globose, the disc dark, collar much narrower; scutollum 
semicircular: abdomen stout, oval, with two slender black tu- 
bercles or tubes on each side of the antepenultimate joint, furnished 
with a horny process at the apex in the female : wings fovu", de- 
flexed in repose (fig. r), transparent, iridescent; superior very 
ample, twice as long as the boc'y, stigma long and green, the 
costal cell rather small and somewhat oval, the furcate apical cell 
small; inferior wings much smaller, with two oblique nervures. 
Females often apterous : legs long, slender, and green, with short 
hairs on the tibiae ; thighs black, except at the base : shanks 
black at the apex ; tarsi biarticulate, of the same colour, with two 
minute claws : fig. 10 magnified and represented flying, tig. r the 
natiu'al size. 
On the 12th of July, 1S4'2, I detected many of the apterous 
Aphides amongst the chaft' of the wheat-ears, apparently sucking 
the stem ; they were brown and sliining ; and in looking over some 
wheat-fields at Cranford with Mr. Graham, tlie middle of last 
August, we found numbers of the Aphides in every stage of 
* Linn. Trans., vol. iv. p. 238. 
