LIST OF ILLUSTRATIONS. 



INTRODUCTION. 



MG. 



1. Eggs of Arctia menthastri . 



2. Eggs of Bombyx neustria on 



birch .... 



3. Typical forms of larva? 



4. Typical pupal form of an 



insect .... 



5. Pupal case of Vanessa urticce, 



6. First emergence of Tor- 



toiseshell Butterfly from 

 pupal case 



7. Emergence of Tortoiseshell 



Butterfly more fully ad- 

 vanced .... 



8. 9. Fully developed Tortoise- 



shell Butterfly 



10. Typical mouth parts of in- 



sects .... 



1 1 . Compound eye of insect as 



seen under the micro- 

 scope .... 



12. Typical forms of antennas . 



13. Typical form of leg . 



14. Diagram of longitudinal 



section of an insect 



15. Horizontal section through 



the head of a worker bee 



16. Diagram of the chief trunks 



of the tracheal system of 

 an insect 



17. Trachea of butterfly . 



18. Food canal of cockroach . 

 Diagrams of the heart of 



an insect 

 20. Female genital organs of 

 the cockchafer 



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21. Male genital organs of the 

 cockchafer 



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on 



on 



ERIOPHYID.E (Gall-Mites). 



22. Eriophyes ruclis 



23. Abortive swollen buds on 



hazel caused by Eriophyes 

 avellancB 



24. Abortive swollen buds 



birch 



25. Abortive swollen buds 



English yew 



26. "Nail-galls" on leaf of 



lime-tree 



27. Galls on leaves of field 



maple caused by Eri- 

 ophyes macrochelus 



28. Galls on leaf of field maple 



caused ' by Eriophyes 

 macrorhynchus 



29. Galls on leaves of common 



alder caused by Eriophyes 

 Icevis .... 



30. Galls on midrib of the leaves 



of common alder caused 

 by Eriophyes axillaris . 



31. Galls on leaf of Wayfaring- 



tree caused by Eriophyes 

 tetanothrix 



32. Malformation of the flower 



of ash caused by Eri- 

 ophyes fraxini 



33. Edges of hawthorn leaf 



rolled inwards by Eri- 

 ophyes goniothorax 



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