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37. 
Annals Entomological Society of America [Vol. VIII, 
PLATE IV. 
Ental view of the ventral aspect of the mouth-cone and a portion of 
the head-capsule of the nymph of Cephalothrips yucce. The parts 
have been spread and the pharynx omitted. 
The union of the salivary ducts in Cephalothrips yucce. The solid 
lines indicate the structures in a sagittal section, ten microns thick. 
Distal portion of a longitudinal section of the long salivary glands of 
Heliothrips femoralis. 
Manner of interlocking of the grooved maxillary setae of Cephalothrips 
yucce when projectéd from the mouth-cone. 
Sagittal section of the left, asymmetrical mandible of Heliothrips 
femoralis. 
Ental view of the ventral aspect of the mouth-cone and a portion of the 
head-capsule of Heliothrips femoralis. The parts have been spread 
and the maxillary extensions (et.) omitted. 
Ental view of the ventral aspect of the mouth-cone and a portion of the 
head-capsule of the nymph of Heliothrips femoralis. The parts have 
been spread and the pharynx omitted. 
The tentorium of Cicada septendecim. 
Longitudinal section of the short salivary gland of Heliothrips femoralis. 
Longitudinal section thru a dilated duct of a long salivary gland of 
Heliothrips femoralis. The distal portion of the gland shown in 
figure 24. 
Ental view of the right maxillary sclerite of Heliothrips femoralis. 
PLATE V. 
Ental view of the ventral aspect of the mouth-cone and a portion of the 
head-capsule of Cephalothrips yucca. The parts have been spread 
and the pharynx omitted. 
Ental aspect of the left maxillary sclerite of Cephalothrips yucce. 
Ental view of the ventral aspect of the mouth-cone of Cephalothrips 
yuccee. The parts have been spread. 
Ental aspect of the right maxillary sclerite of Cephalothrips yucce. 
Piate VI. 
Frontal section thru the commissures connecting the supraoesophageal 
and suboesophageal ganglia of Heliothrips femoralis. 
38-44. Cross-sections of the pharynx from the dorsal end to the tip of the 
45. 
46. 
47. 
48. 
49. 
. 50. 
51. 
mouth-cone of Heliothrips femoralis. Each second or third section 
figured. 
Lateral view of the pharynx of Heliothrips femoralis. 
Caudal aspect of the pharynx of Heliothrips femoralis. The extensions 
over which the maxillary setae pass, have been omitted. 
Caudal aspect of the Y-shaped piece located caudad of the pharynx. 
Caudal aspect of the pharynx and labrum of Cephalothrips yucce. 
The extensions, over which the maxillary setae and left mandible 
pass, have been omitted. 
Lateral view of the pharynx of Cephalothrips yucce. 
Frontal section thru the commissures connecting the supraoesophageal 
and suboesophageal ganglia of Cephalothrips yucce. 
Cross-section of the oesophagus of Cephalothrips yucce at the point 
where ducts from the head-glands (d.) pass laterad of the oesophagus 
in their extension from the head-glands to the two openings on the 
caudal aspect of the pharynx. 
52-57. Cross-sections of the pharynx from the dorsal end to the tip of the 
mouth-cone of Cephalothrips yucce. Each second or third section 
figured. 
