PLATE LXVII 



Figure 1. Transverse section through the head of Pedicuhts 

 vestimenti, anterior to the insertion of the antennae 

 and posterior to the opening of the proboscis sheath. 

 The central cavity is the buccal cavity, b.c., the 

 ventral one the proboscis sheath, pb.s. ; at this level 

 the two are connected by a membraneous expansion 

 from the wall of the sheath. d.b.c., the dilator 

 muscle of the buccal cavity, passing obliquely to its 

 insertion, d.pr., the dorsal and median set of protractor 

 muscles, passing backwards to be inserted into the 

 posterior part of the buccal cavity. 1. pr., v.pr., the 

 lateral and ventral protractor muscles, passing to the 

 fulturae. pb., the proboscis, f.b., a fat body cell, 

 x 260. 



Figure 2. A section from the same series, just anterior to the 

 level of the insertion of the antennae, ant., antenna, 

 ft., the fulturae. br., a median process from the brain. 

 Other letters as above, x 260. 



Figure 3. A section from the same series, at the level of the 

 eyes. l.d.ph., lateral, and d.d.ph., dorsal, dilator 

 muscles of the pharynx, sph., sphincter muscle of 

 the pharynx. r.ph., retractor muscles, passing for- 

 wards, tr., trachea, gl., cephalic gland (salivary ?). 

 v.pr., ventral protractor muscle of the proboscis, ha., 

 haematocoele. e., eye. X 260. 



Figure 4. A section from the same series, behind the brain, at 

 the posterior end of the head, oes., oesophagus, n.c., 

 nerve commissure passing to the neck. l.pr.p., 

 lateral protractor of the proboscis, p.rt.p., retractor 

 of the proboscis. lb., the labium. The two chitinous 

 slips in front of the anterior lamina are probably the 

 basal parts of the maxillae, x 260. 



Figure 5. A vertical longitudinal section through the head. The 

 section from which this was drawn was not quite 

 straight, the posterior part being to the right of the 

 middle line, pr.mu., protractor muscles of the buccal 

 cavity, ft., fulturae. gl., gland opening into the 

 sheath of the proboscis, sph., sphincter muscles 

 of the pharynx. The pharynx and oesophagus are 

 not shown, rtph., retractor muscles, which reach 

 the pharynx and the buccal cavity after passing between 

 the supra- and the infra-oesophageal ganglia, s.g. and 

 i.g. d.d., fibres of the dilator muscles of the pharynx, 

 n., nerve cord passing to the neck, mu.pr., muscles 

 at the base of the proboscis, mainly retractors, f.b., 

 fat body. There is always a large amount of fat body 

 in the ventral wall of the head, x 210. 



