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DESCRIPTION OF ILLUSTRATIONS. 
FIG. 
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lo. Mouth parts. — e, ligula ; /z, maxillae ; 2, maxillary 
palpi; y, labial palpi; paraglossae; a., mentum ; 
sub-mentum ; c., cardines ; d, lora ; stipe ; /z, blade ; 
bouton; /, membrane; 0, groove 
A, labial palpus; sensory pits of Hicks; B, maxillary 
palpus 
End of ligula- — r, hairs; pits and papillae; spoon 
or bouton ; clavate hairs ; t, guard hairs 
13. Section of tongue surrounded by maxillae and labial 
palpi. — maxillae; /, labial palpi; 0, tubes; p, thin 
plate of maxilla; //, hairs; A, expanded, as when suck- 
ing; B, compressed, as when swallowing 
14. Section of tongue. — A, through middle; B, narrow part 
above the spoon ; sheath ; membrane ; r, rod and 
groove; <?, blood space; trachea; d, taste nerve; 
f, tubes when closed ; y hairs 
15. Hind legs of. A, B, worker; c, queen; D, drone; 
coxa; b, trochanter; r, femur; d, tibia; e, /, g, h, i, 
collectively, the tarsus ; A, B, d, pollen basket in 
worker ; B, r, pecten ; j, auricle ; B, e, combs 
16. Details of legs of worker. — A, e, palma; B, e, planta; 
d, tibia; k, spine and velum on front leg; /, pecten; 
y, spur or second leg 
17. Pulvillus and claws. — g, h, digit! ; claws; n, pul- 
villus ; 0, tactile hairs 
18. Wings. — A, anterior; r, costal nervure ; a, trough on 
internal cell; B, posterior; b^ booklets on costal ner- 
vure ; C, enlarged ; trough ; booklets ; D, section 
showing the way the booklets, b, fasten on to the trough 
19. Diagram illustrating pressure of air on wings. — r, costal 
nervure ; w, wing membrane 
20. Diagram representing vibration of bee’s wing. — curve 
produced by tuning fork ; marks made by bee’s wing 
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