710 MR. P, R. AWATI ON THE MECHANISM 
posteriorly from the tentorial body to the posterior wall of the 
head. They are broad, elongate, and flattened dorso-ventrally. 
The pharynx is supported by them (text-fig. 20) just behind the 
tentorial body, their connection with the pharynx being through 
connective tissue. 
At the far end, towards the wall of the head, the arms begin to 
bifurcate, one armlet going straight to the posterior wall and the 
other to the side of the head (text-fig. 5). 
Their functions are very important in the mechanism of 
suction :— 
(i.) They support the pharynx at the place where there is great 
tension. 
(ii.) The pump muscles are attached to them ventrally. 
(iu1.) The valvular muscles find support in them. 
(iv.) The maxillary levers are supported by them. 
Tt will be seen that the pharynx has support on all sides, 7. ¢. 
ventrally, laterally, and dorsally (see below). 
(IV.) The Levers. (Text-figs. 1,5, 6,19, 20, Mx.L., Md.L.) 
Besides the tentorium proper, there are other chitinous struc- 
tures which are connected to the outer and inner stylets. They 
Text-figure 20. 
Lygus pabulinus. 
Transverse section, showing the antagonistic muscles, the retort-shaped organs, 
the posterior arms of the tentorium, etc. Ob. 3 & Oc. 12. 
For explanation of the lettering see p. 693. 
are known as the mandibular and the maxillary levers, and are 
placed at right angles to the direction of the stylets. 
