488 
Observations on the various Insects 
and the " Mouche jaune a bandes noires" of Geoffrov. * This 
species certainly differs from all the specimens I have bred, as 
well as from those in my cabinet : f it is yellow, and has only 
three black stripes on the thorax ; the antennae are black or yellow, 
with the anterior margin, and seta black ; crown with two black 
triangular spots ; abdomen yellow ; fascia and basal dots 
fuscous ; tail black ; legs yellow ; the tarsi are all fuscous. 
He further says, " The barley (Hordenm distichon) is attacked 
with us by a Chlorops which appears to be the same as that 
which devours the stems of the wheat; it produces the same 
alterations, and scoops a longitudinal groove on the outside of the 
young stem, under the ear." 
" Besides that insect," says Dr. Herpin, the barley is attacked 
by the larvae of another Chlorops, much smaller than the preced- 
ing, which are fovind to the number of from six to ten in each 
ear ; tliey eat the sexual organs of the flowers, and render the 
fructification imperfect, so that the ears are quite sterile. 
" We often find also upon the same piece of barley, with 
the first-mentioned Chlorops, which eats the superior part of the 
stem, many other little Chlorops of the second species, which devour 
the ear. These two species undergo their metamorphoses in the 
manner already described." 
11. MuscA Frit. 
I must not omit to notice this little fly, which was first made 
known by Linnaeus's Memoir in the ' Stockholm Transactions' 
for 1750, and concerning which there is much difficulty regarding 
the species, owing to the brevity of his description, and it appears 
to me that its economy is different to any of the other recorded 
species. As, however, all naturalists are agreed that it is a 
Chlorops, it will be better to introduce it here. 
In the 'Fauna Suecica'J Linnaeus describes tliis fly as having 
" setaceous antennae, with black pile or short hairs ; the balancers, 
hinder feet, and abdomen are pale green. It is the size of a flea 
(which is large in Sweden) ; the body is the form of Musca 
(iomestica (the common house-fly) ; black ; very agile, as if 
dancing; eyes fuscous; hinder feet pale; balancers pale; ab- 
domen fuscous, more of a pale green beneath." He says, "It 
resides between the glumes (husks) of the barley, and certainly 
destroys as much as one-tenth of the grain, causing the little, light. 
* Geoff., Hist, abrei^ee dcs Ins., v. 2, p. .'308. 
t Vide Cuitis"s Guiile, ffenus i;{-t5, wliere ;!;") species of these flics, coni- 
])iised in Cliloiops and the sul)y,x'mis Osi-iuis, arc recorded as inhabiting 
England. 
% P. 456, No. 1851. 
