1911] Muir and Kershaw — Mouth-parts of Hemiptera 11 



EXPLANATION OF PLATES. 



Fig. 1. Head of a Cicada 



Fig. 2. Head of a Cercopid 



Fig. 3. Head of a Membracid 



Fig. 4. Head of a Derbid 



Fig. 5. Head of a Pockillopterid 



Fig. 6. Head of a Lygaeid. 



Fig. 7. Head of a Pentatomid 



Fig. 8. Head of a Coreid 



Fig. 9. Head of a Pentatomid 



Fig. 10 



Head of a Reduviid 

 In these ten figures a = front view, b = side view, c = dorsal view. 



Fig. 11 



a = Longitudinal median vertical section of anterior part of head. 

 b = View looking down on pharynx, etc. 

 c = View looking on side of pharynx, etc. 



In b and c, some of the parts are drawn slightly out of their natural position, 

 to avoid hiding some of the structure. 



Fig. 12 



a = Longitudinal median vertical section of head. 

 b= Longitudinal horizontal section of head (slightly diagrammatic). 

 c= Transverse section of head in front of antennae, looking towards the 

 occipital foramen. 



d= Transverse section cut rather more posteriorly than c. 



Fig. 13 

 Transverse section of rostrum. 



Fig. 14 

 Part of R. H. mandibular seta, much enlarged. 



Fig. 15 

 Head of a Thrips 

 a = front view. 

 b = side view 

 y=Ieft maxilla enlarged 

 z = articulation of seta with mandibular pillar 



