HEMIPTERA. 53 
spot they occupy. Their body then becomes desiccated and forms a 
solid crust or shell which covers their ova. Other females protect 
theirs by enveloping them with a white substance resembling cotton. 
Those which are spherical form a sort of box for them with their 
body. The young Cocci have an oval body, much flattened and fur- 
nished with the same organs as that of the mother. They spread 
themselves over the leaves, and towards the end of autumn approach 
the branches, on which they fix themselves to pass the winter. The 
females prepare to become mothers on the return of spring, and the 
males to transform themselves into chrysalides under their own 
skin. These chrysalides have their two anterior legs directed 
forwards and not backwards like their remaining four and the whole 
six in those of the other sex. Having acquired their wings, these 
males issue backwards from the posterior extremity of their domi- 
cil, and proceed immediately in search of their females. They are 
much smaller than the latter. Their.copulating apparatus forms a 
recurved kind of tail between the two terminal sete of the abdomen. 
Reaumur saw two granules resembling simple eyes on that part of 
their head which corresponds to their mouth. I have distinguished , 
on the head of the male, C. ulmi, ten similar bodies, and two species 
of halteres on the thorax. Geoffroy says the females havefour white 
threads at the posterior extremity of their abdomen, which are only 
visible by so pressing that part of the body as to make them pro- 
trude. 
Dorthez has observed a species on the Euphorbium characias 
which appears to differ in form and habits from the others. This 
induced his friend, the late M. Bosc, to convert that species into a 
genus which he named Dorthesia. The antenne consist of nine 
joints, those of the male being longer'and more slender in the male 
than in the female. The latter continues to live and run about after 
laying her eggs., The posterior extremity of the male’s abdomen is 
furnished with a tuft of white threads. This Insect is consequently 
more nearly allied to the Aphides than to the Cocci(1). 
_ The Gallinsecta appear to injure trees by a superabundant sudo- 
resis through the punctures they make in them, and of course those 
who cultivate the Peach, Orange, Fig and Olive are particularly 
on their guard against them. Certain species fix themselves to the 
roots of plants. Some are valuable for the rich red colour they fur- 
(1) M. Carcel, a zealous and learned entomologist, has lately confirmed these 
observations by new investigations. See the Nouy. Dict. d’Hist. Nat., 2d-edit., 
article Dorthés. 
