412 Macfarlane . — Observations on Pitchered 
external surface, 3 to 3*5 being the average over a square 
millimetre, but they are decidedly more numerous on the 
dorsal flap, which may show 5 to 6 over a similar area. Hairs 
pointing very irregularly, the majority more or less upwards, 
are also found over the tube, and become specially abundant 
and strong on the lid ; but these, so far as I can see, will 
perform no special part, though they may represent a rudi- 
mentary state of the more perfectly developed condition seen 
in 5 . variolaris . The attractive surface is practically identical 
with that of .S'. flava, the hairs being only slightly smaller. 
Both species agree also in having a triangular-shaped ventral 
prolongation of the attractive surface running down into the 
conducting region. On the conducting surface are very fine 
closely-set hairs, but there is an entire absence of glands. 
The latter are also absent from the detentive surface, the hairs 
of which are extremely fine for their length. It is to be noted, 
then, in this species, that glands are only present on the 
attractive surface. 
S. purpurea. Very careful descriptions of this species have 
been given by Voigt, Hooker, and others, which stands alone 
in having a special glandular surface in the tube. In addition 
to many alluring glands, there are on the outside numerous 
strong, stiff, blunt hairs, rather irregularly disposed, though 
most point upwards. I need not here repeat the descriptions 
of previous workers, except to emphasize the fact that all the 
glands of the plant resemble each other structurally. In 
PI. XIX, Fig. 6, illustrations are given of the areas and of 
the hairs occurring on these to aid in descriptive comparisons 
of a hybrid of this species with its parents. 
X. psittacina . This is the most aberrant of all in its 
histology as in its general morphology. The alluring glands 
agree in number and disposition with the species just discussed, 
but they are extremely abundant along the outer side of the 
indexed rim, so as to resemble Darlingtonia. The attractive 
surface differs from that of the other species in the great length 
and delicacy of its hairs, which resemble most the detentive 
hairs of X. rubra. The honey-glands found with these are 
