NY MR. P. R. AWATI ON THE MECHANISM 
bases, and are curved as they pass below the maxillary stylets, 
to which they are closely applied. 
Text-figure 22. 
Lygus pabulinus. 
Transverse section, showing the supra-cesophageal ganglion, the retractor 
muscles, etc. Ob. 3 & Oc. 8. 
For explanation of the lettering see p. 693. 
Their relations are :— 
(i.) They support the maxillary stylets. 
(1i.) The maxillo-mandibular muscles are attached to them. 
(iii.) They never give attachment to any of the maxillary muscles, 
which are attached to the maxillary stylets themselves. 
Tue MUSCLES OF THE HEAD, 
The musculature of the head is very complicated. The diversity 
of the muscles is correlated with the diversity of function of the 
structures which are required for effecting suction. 
The groups of muscles are as follows :— 
(1) The Divaricators. (Text-fig. 2, D.M.) 
These muscles are attached to the upper wall of the pharynx ; 
the mode of their attachment varying in different parts of the 
head. In the clypeal region they are attached to the ligament of 
the operculum (the upper wall of the pharynx); while in the epi- 
cranium they are attached to the pharynx directly. 
T find that these muscles are strengthened by chitinous rods 
comparable perhaps to the tendons in the muscles of the verte- 
brates (text-fig. 2). 
