Mum. — Ascodipteron. 



PLATE 3. 



Fig. 20. Diagrammatic section through head of Hippobosca equinus. da. 



dorsal arm of pharynx; dph. dorsal wall of pharynx; fl. frontal 



lunule; he. head-capsule; mp. maxillary palpus; ces. oesophagus; 



om. oral membrane; sr. salivary ducts; st. stipes; vp. ventral 



plate of labium; vph. ventral wall of pharynx. 

 Fig. 21. Diagrammatic section through head of Glossina palpalis. ant. 



antennae. Other lettering as in Fig. 20. 

 Fig. 22. Diagrammatic section through head of Nycteribosca amboinensis. 



Lettering as in Fig. 20. 

 Fig. 23. Diagrammatic section through head of Cyclopodia albertisis. 



Lettering as in Fig. 20. 

 Fig. 24. Diagram of extension of muscid pharynx. 

 Fig. 25. Diagram of extension of hippoboscid pharynx. 

 Fig. 26. Dorsal view of labium and labrum-epipharnyx of N. amboinensis, 



slightly flattened to show latter, le. labrum-epipharynx; vp. 



ventral plate of labium. 

 Fig. 29. Diagrammatic section through pharynx and proboscis of A r . 



amboinensis. da. dorsal arm of pharynx; dp. dorsal plate of 



labium; dph. dorsal wall of pharynx; hp. hypopharynx; le. 



labrum-epipharynx; hn. lateral membrane; oes. oesophagus; 



sr. salivary ducts; vp. ventral plate of labrum; vph. ventral wall 



of pharynx. 

 Fig. 28. Diagrammatic section through base of labium of N. amboinensis. 



dp. dorsal plate of labium; hp. hypopharynx; le. labrum. Epi- 



pharynx; hn. lateral membrane; vp. ventral plate of labium. 

 Fig. 29. Diagrammatic section through anterior part of labium of N. 



amboinensis. Lettering as in Fig. 28. 

 Fig. 30. Diagrammatic longitudinal section through pharynx and labium 



of a female of A. speiserianum. h.c. head-capsule; om. oral 



membrane. Other lettering as in Fig. 27. 

 Fig. 31. Diagrammatic section through base of labium of a female of 



A. speiserianum. Lettering as in Fig. 28. 

 Fig. 32. Diagrammatic section through anterior part of labium of female 



A. speiserianum. Lettering as in Fig. 29. 



