384 
FLY. 
white colour with a slight tinge of pale red, and 
of a lengthened shape, with a sharpened front, in 
which the month is situated, and from whence the 
body gradually enlarges in size to the last or ter- 
minal segment, which is' of a very broad and flat- 
tened form, surrounded )>y several slightly promi- 
nent tips, and furnished with a pair of dusky 
specks resembling eyes; so that an inaccurate 
spectator might easily mistake this part for the 
head and the proper head for the tail. When the 
animal changes to a chrysalis, the skin dries round 
it, and the whole assumes a completely oval form, 
and a reddish colour, soon changing into a red- 
dish brown. In ten days more the Fly itself 
emerges, which is too well known to require par- 
ticular description. 
Musca vivipara greatly resembles the preced- 
ing, and is found in similar situations, but is 
viviparous, disclosing small ready-formed larvae 
instead of eggs, which in this species are hatched 
internally. This particularity is not confined to 
the present species, but has been observed in 
some others of this genus. 
To this as well as the preceding has been ap- 
plied the observation Tres muscct consuminit cada- 
ver ecjiii (cqiie cito ac leo ; the number of larvae 
proceeding from the flies, and the quick evolution 
of the successive broods destroying the same quan- 
tity of flesh in a given time as the predacious 
quadruped, who devours a great quantity at cer- 
tain intervals only; while the process of destruc- 
