INSECTS AND FLOWERS. 
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Fig. 3. Aristohchia Clematitis ; a, flower in an earlier, b, in a later stage ; 
st, stigmas ; an, anthers ; t, tube of calyx ; l, standard-like lip of 
calyx ; in, insect imprisoned in globular cavity. 
Fig. 4. Bee sucking honey from flower of Stachys sylvatica. 
Fig. 5. Head of humble-bee, Bornbus agrorum ; li, ligula ; w, membranous- 
lobe at tip of ligula ; pi, labial palpi ; la , lamina ; pm, maxillary 
palpi ; mt, mentum. 
Fig. 6. Flower of tway-blade, Listera ovata ; b, showing an insect] (ich- 
neumon) seated on the labellum, and sucking the honey, 
t Fig. 7. Vallisneria spiralis ; m, male ; f, female flowers. 
Figs. 1, 2, and 5 after H. Muller ; figs. 4 and 6 after Sprengel. 
