1923. ] Anatomy and Bionomics of Red Colton Bug 33 
eggs in a tubule increase in size from top downwards, the low- 
est being the largest It is pale yellow in colour and has a 
not on hard plant tissues, etc., which would necessitate piercing 
organs. 
Lying over the upper surface of the uterus is a peculiar bell- 
shaped accessory gland which is continued as a thick-walled 
chitinized duct coloured red. This duct becomes coiled and 
opens into the uterus (GJ. Ut.1, Fig. 15). Similar to this is an- 
other tube, which communicates with the uterus (Fig. 15) by 
means of a common opening. Probably this duct serves as a 
spermatheca for the extra spermatozoa. Near the terminus 
of the uterus and opening into the latter is another pair of 
lobulated glands (GI. Ut.3). The incubation period of the eggs 
is 3-4 days depending upon the temperature and hygroscopical 
conditions of the atmosphere. 
Nervous System (Fig. 16):—consists of (a) cerebral! ganglia, 
and the nerves originating from them, (b) the ventral nerve 
cord with two ganglia in the thoracic region. 
Since the supra- and sub-oesophageal ganglia are con- 
nected to each other by wide band-like commissures the exact 
limits of the two are not discernible. In transverse section they 
appear as a thick nervous mass pierced by the pharynx (Fig. 8). 
The supra-oesophageals are two pear-shaped ganglia superficially 
separated from each other, especially in the posterior region. 
The ganglia are continued forwards as the thick optic nerves 
which pass laterally to the eyes (Fig. 16, O.P.N.). The antennal 
nerves originate from the commissure, and cross the optic at 
its under side to supply the base of the antennae (ANT. N.). 
From below the origin of the antennal nerve arise two small fine 
nerves which end at the base of the maxilla and mandible of 
each side. 
The ventral nerve cord (V.N.C.) runs from the sub-oeso- 
phageal ganglia to the posterior end of the abdomen. In the 
thorax the nerve cord is thick and flat and its double nature is 
evident, whilst in the abdomen it becomes narrow giving one 
branch in segment V, and two or three branches in the seg- 
ments behind. 
The first thoracic ganglion lies on the floor of the prothorax, 
being small and giving one nerve oneach side to the first pair of 
legs. 

The second thoracic ganglion lies in the mesothorax. It 
is larger than the first and gives origin to the nerves to the second 
