ILLUSTRATIONS 



FIG. PAGE 



A pet queen of Bombus terrestris incubating her brood 



Frontispiece 



i . Wing-hooks of Bombus muscorum . . Q 



2. Antenna-cleaner in fore-leg ... . IO 



3. Diagram of commencing nest . . . . 19 



4. Hairs of humble-bee, magnified ..... 20 



5. Pollen- collecting apparatus in hind-legs of queen and 



worker humble-bee ...... 21 



6. Honey -pot from nest of Bombus lapidarius, seen from 



above ......... 26 



7. Honey-pot from nest of Bombus lapidarius, side view 26 



8. Eggs, larva?, and pupae of Bombus terrestris . . .28 



9. Nest of B. terrestris, showing groove in which queen sits 30 



10. Diagram of the initial stages of the humble-bee's brood . 2>3 



11. Comb of B. lapidarius, showing two honey-pots brimful 



of honey ..38 



12. Comb of B. lapidarius, showing group of half-full honey- 



pots and irregular clusters of worker cocoons . . 39 



13. Comb of B. lucorum, showing pollen-pots and honey-pots 41 



14. Comb of B. agrorum, showing pollen-pockets . . . 42 



15. Caterpillar of Aphomia sociella; larva and puparium of 



Brachycoma devia ; larvae of Volucella bombylatts ; 

 larva of Fannia ..... .74 



16. Sphtzrularia bombi ..... 80 



17. Nest of Bombus helferanus ..... 91 



18. Plan of Sladen's humble-bee house .... 94 



xi 



