LIST OF ILLUSTRATIONS 



PLATE FACING PAGE 



I. Fig. 1. Head of Muscid fly from the front. 



Fig. 2. Head of Muscid fly from behind. 



Fig. 3. Diagram of insect segmentation. 



Fig. 4. Ocellar triangle of Musca. *.': ; ' 



Fig. 5. Section through chitinous integument. 



Fig. 6. Head of male Tabanus from the front ... 11 



Reference letters, Plates I to VII ... 11 



II. Fig. 1. Antenna of Musca nebulo. 



Fig. 2. of Glossina submorsitans. 



Fig. 3. of Hippobosca maculafa. 



Fig. 4. of CuUx fatigans, male. 



Fig. 5. of Chrysops dispar. . 



Fig. 6. of Lyperosia minuta. 



Fig. 7. of Tabanus albimedius ... 17 



III. Fig. 1. Head of Muscoidean fly, from the front. 

 Fig. 2. Facets of compound eye of Tabanus, 

 Fig. 3. Head of Haematopota pluvialis, female, 



from the front. 



Fig. 4. Scheme of the mouth parts of Orthorraphic 

 Diptera. 



Fig. 5. Scheme of the sucking apparatus of Orthor- 

 raphic Diptera ... ... 21 



IV. Fig. 1, First maxilla of the cockroach. 

 Fig. 2. Mandible of the cockroach. 

 Fig. 3. Second maxilla of the cockroach. 



Fig. 4. Mouth parts of Haematopota ... 23 



V. Fig. 1. Sucking apparatus of Tabanus. 



Fig. 2. Transverse section of head of mosquito. 



Fig. 3. Labium of Haematopota. 



Fig. 4. Distal end of maxilla of Tabanus. 



Fig. 5. Sucking apparatus of mosquito ... 26 



VI. Fig. 1. Hypopharynx of Ceratopogon. 



Fig. 2. Labrum-epipharynx of Ceratopogon. 



Fig. 3. Labrum-epipharynx of Joblotia. 



Fig. 4. Hypopharynx of Joblotia. 



Fig. 5. Maxilla of Joblotia. 



Fig. 6. Labrum-epipharynx of Tabanus albime : 



07 dius. 



Fig. 7. Mandible of Simulium indicum. 



Fig. 8. Hypopharynx of Simulium indicum. 



Fig. 9. Labrum-epipharynx of Simulium indicum. 



