loo 
British aphidBs. 
shown. The tubes appear to be cylindrical and of an 
even diameter throughout. 
Fig. 5. — Alimentary canal of Myzus persicce. g, 
gullet ; stomach ; intestine ending in the colon h. 
Fig. 6. — Portion of the left side of Ghermes ahietis^ 
showing g g g g, four glandular organs for secreting 
the silky matter which invests the insect. The silk 
issues from numerous mouths disposed in semicircular 
rows. 1 1, large vessels (tracheal ?) passing in the 
immediate neighbourhood of these glands ; part of 
the lower wing. 
Figs. 7 and 8. — The mouths of similar glands from 
Amycla fiisiformis^ greatly magnified, showing the silk 
issuing as a single rod. 
Fig. 9. — The rod undergoing a lengthening through 
a splitting up longitudinally into a flat spiral. 
Fig. 10. — Part of tibia and tarsus of the dimorphous 
form of Chaitophoms aceris, showing the flabellsD and 
prehensile hairs, h, in the neighbourhood of the claws. 
Fig. 11. — Oil-like globules, largely distributed 
throughout the body of most Aphides, and particularly 
crowding near the base of the nectary. On exposure 
to «the air, or on touching with a dilute solution of 
potash, they crystallize like cystine or margarine, as 
shown in the figure. 
