300 
Acanthia lectularia 
in water, and is brightest in a famished specimen. On dissecting a bug 
“ dry ” the receptacles were seen without microscopic aid as two blood- 
red or crimson specks, while dissecting under water they are found to 
vary in colour from terra-cotta to pearly white, depending on the time 
which has elapsed before they are laid bare. Should they be found 
coloured terra-cotta, they soon lose the tint and become pearly 
white. 
Besides varying in colour, the receptacles vary in form, being when 
full shaped like an egg and, when partially emptied, more like a pear 
(when pear-shaped the duct leads out from the broad end), but in no 
specimens of the scores examined has the. writer found them spherical. 
Landois calls them “ kugelformigen ” in the text, yet he figures them 
as more or less egg-shaped. (For his figure refer to the plates illus¬ 
trating his article, Plate XXII, fig. 1.) 
Leading from the receptacle is a thick-walled duct (-02 mm.) ^\dth 
a very narrow lumen (-002 mm.). This duct after leaving the receptacle 
divides almost at once into two, each rather more slender than the 
parent duct. The lumen in these is similarly rather finer than in the 
short parent length. This latter slightly tapers from its opening into 
the reservoir down to where it bifurcates, and at its inner opening 
slightly bells out, forming a funnel. Considering their size the ducts 
are very strong, and persist through the precarious operation of separ¬ 
ating them out. Possibly this strength is due to the lining membrane 
of the duct being strongly chitinised. When the duct happens to be 
broken, this lining often protrudes from the end. Landois says that the 
inner coating of the duct is transversely marked and recalls a trachea 
thread. This is true to a certain extent, but only under oil immersion 
magnification is the effect seen, and then but feebly. 
The two daughter ducts have different destinations. One goes 
forward to the head, and meeting the companion one from the other- 
side runs parallel with it and under the pump (Fig. 15) till they end 
at the base of the labium where they discharge. The other goes forward 
a little way then bends round, and running back, leads into the salivary 
gland of its side (Fig. 28). Landois calls these the “ small spherical 
salivary glands,” and the name is very appropriate. They are situated, 
one on either side at the anterior lateral region of the stomach, and 
are fastened to it by a groxrp of delicate muscle bundles. The ducts 
leading from them enlarge slightly and gradually, between the gland 
and the receptacle. Landois appears to have confused between these, 
as he was evidently not able to trace the connection between the two. 
