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between the first and second fingers (Nuttall and 
Shipley). 
The labium proper stops short at the point of 
junction of the labella, but is continued on its upper 
surface as a blunt point covered with fine hairs 
(Dutton). We may liken it to a pen continued on 
beyond the penholder, the junction of pen and^ pen¬ 
holder being the point at which- the labella are hinged 
on. 
Dutton’s Membrane.—The area between the end 
of the labium proper and the extreme tip is covered 
by an extremely thin membrane (Dutton). In the 
act of biting, when the labella are separated, this 
membrane is somewhat stretched, and applied to the 
skin. 
The Escape of the Filarial Embryo 
It has been shown ty Low and James that the 
filarial embryo occurred in the proboscis; according 
to Low among the stylets. According to Dutton, 
the embryo really lies in the tissue of the fleshy labium, 
moreover with its head at the level of the membrane 
described above, and that it is by the rupture of this 
excessively thin membrane that the embryo escapes. 
Grassi and Noe think that the embryo escapes through 
the middle of the bent-up labium through a rupture 
at this point, but Dutton’s explanation seems more 
likely. 
The epiphary?ix .—Is the central tube through 
which the blood is sucked. Its point slopes off somewhat 
like the tip of a hypodermic needle. In cross section 
it has the shape of an fl, the completion of the tube 
being formed by the apposition below of the hypo- 
