698 MR. P. R. AWATI ON THE MECHANISM 
as the suction-canal, and one ventral facing the labium, func- 
tioning as the ejection-canal, through which saliva is forced down 
by the salivary pump (text-figs. 8, 9, 10, Mx.8t., Su.C., E.C.). 
There are not any extra-chitinous structures to unite the two 
stylets to form the canals; the three ridges of each stylet 
apparently uniting with those of the other. They can be detached 
from one another with a little force. This fusion may easily be 
seen in a series of cross-sections. 
Text-figure 5. 
Lygus pabulinus. 
Lateral longitudinal section, showing the arrangement of the muscles 
in the head. Ob. 3 & Oc. 4. 
For explanation of the lettering see p. 693. 
The tips of the stylets are smooth and lancet-shaped, as might 
be expected from their function (text-fig. 23). In certain aquatic 
forms they are ornamented with minute incurved hooks (0. 
Geisse (18). Within the plant-tissues the tips of the maxille do 
not end simultaneously ; one of them is pushed a little further 
than the other (text-fig. 25). 
(ii.) The internal part. This lies within the head. It gets 
gradually flatter and broader when it is traced back. Hach stylet 
