1915] 
Fig. 58. 
Fig. 58a. 
Fig. 59. 
Fig. 60. 
Fig. 61. 
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The Head and Mouth-Parts of Thysanoptera 
PLATE VII. 
Sagittal section thru the head and prothorax of Heliothrips femoralis. 
The salivary glands have been omitted. 
59 
The valve at the dorsal end of the pharynx of figure 58 more enlarged. 
Sagittal section thru the head and a portion of the prothorax of Cephalo- 
thrips yucce. The salivary glands have been omitted. 
Caudal aspect of the labium of Heliothrips femoralis. 
Caudal aspect of the labium of Cephalothrips yucce. 
LIST OF ABBREVIATIONS. 
Anterior arms of the tentorium. 
Alimentary canal, 
Antennae. 
Caudal projections or arms. 
Common duct of the salivary 
glands. 
Clypeus. 
Commissure. 
Chitinous tendon. 
Duct of the head-glands. 
Dorsal arms of the tentorium. 
. Dorsal dilating muscles of the 
pharynx. 
Dilated lumen. 
Dilating muscles of the pharynx. 
Duct from glandular tissue near 
mandible. 
Elastic membrane. 
Ental extensions of the maxil- 
lary sclerites. 
Fold in the clypeus. 
Front. 
Gena. 
Head-glands. 
Invaginations of the anterior 
arms of the tentorium. 
Invaginations of the dorsal 
arms. of the tentorium. 
Invaginations of the posterior 
arms of the tentorium. 
Lumen. 
Labium. 
Labial palpus. 
Duct of the long, salivary gland. 
Ental extensions of the labium. 
Left mandible. 
Labrum. 
Long salivary gland. 
Mentum. 
Membranous area. 
Muscle. 
Maxillary seta. 
mx. g. 
mx. p. 
mx. pl. 
mx. Ss. 
NX 
ZC. 
. Ventral, 
Maxillary guide. 
Maxillary pillar. 
Maxillary palpus. 
Maxillary sclerite. 
Notch. 
Nerve. 
Occiput. 
Ocellus. 
Oesophagus. 
Oenocyte. 
Pharyngeal projection. 
Posterior arms of the tentorium. 
Pharynx. 
Prothoracic leg. 
Pharyngeal pocket. 
Paraglossa. 
Prothoracic sclerite. 
Chitinous plate. 
Right rudimentary mandible. 
Reticulation. 
Suture. 
Sense cone. 
Duct of the short salivary gland 
Submentum. 
Short salivary gland. 
Caudal head-strip. 
Suboesophageal ganglion. 
Supraoesophageal ganglion. 
Thorax. 
Transverse area of the pharynx. 
dilating muscles of 
pharynx. 
Vertex. 
Ental thickening on margin of 
head-capsule. 
Union of the anterior and pos- 
terior arms. 
Y-shaped pharyngeal piece. 
Ental thickening on margin of 
head-capsule. 
Piece connecting the united 
arms. 
