40*2 
HIPl’OBOSCA. 
of a flattened form, with a rounded abdomen, and 
moderately broad obtuse wings: its colour is a 
blackish chesnut, with the thorax speckled with 
white, and the abdomen marked with obscure 
variegations of a deeper cast: the skin is of a re- 
markably strong or coriaceous nature, since the 
insect may be pressed strongly between the 
Angers without' being apparently injured. The 
female of this insect deposits a single egg at dh 
stant intervals, and so very large is the egg as at 
least to equal, if not in some degree to surpass 
the size of the abdomen itself of the parent in- 
sect*. In reality however, this seeming egg may 
be rather considered as a pupa, since it undergoes 
no farther alteration of form: the Agure of this 
precocious pupa is that of an oval, with an exca- 
vated depression at the lower end: its colour, at 
its Arst exclusion, is milk-white, except a large 
black spot on the part just mentioned. It conti- 
nues perfectly inert, and gradually becomes of a 
brown, and at length, of a polished black colour, 
and thus commences a genuine or conArmed 
pupa, which, if opened after a certain period, ex- 
hibits the Fly in its unadvanced state and of a 
white colour. It often lies during the whole 
winter in this state, the Fly emerging in the suc- 
ceeding summer. 
Hippobosca avicularia much resembles the pre- 
ceding species, but is considerably smaller, and 
* Hippoboscae ovum raatre facile majus, potius Pupa exclu- 
denda in volatile. Lin. Syst, Nat. 
