24. Legs of male "Keyhole" wasps

101   ,,  25. Tibia of male Crabro cribrarius 103   ,,  26. Antennæ of male Crabro cribrarius 103   ,,  27. Head of male and female Crabro clypeatus 103   ,,  28. Parts of the insect 133

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DESCRIPTION OF THE COLOURED PLATES

PLATE A

Figs. 1, 2, 3. Formica sanguinea Latr.: male, female, and worker. The host of Lomechusa (p. 89), also a slave-making species; makes irregular nests of dead leaves, etc., generally against a sloping bank.

Figs. 4, 5. Mutilla europæa Linn.: male and female. One of the few British species of Aculeates where the female is wingless; found in sandy places running in the sun.

Fig. 6. Cerceris arenaria L.: female; burrows in the sand, and provisions its nest with beetles (p. 20).

Fig. 7. Ammophila sabulosa L.: female; burrows in the sand, provisions its nest with caterpillars, peculiar for its very elongated waist (p. 22).

Fig. 8. Crabro cribrarius L.: male; peculiar for its paddle-like tibiæ and flattened antennæ (p. 103).

Fig. 9. Odynerus spinipes L.: male; peculiar for the form of its middle femora, which are cut out almost in two semicircles (p. 101); female makes a tubular entrance to her nest (p. 25).

PLATE B

Fig. 10.—Colletes succinctus L.: female; lines its cells with a gluey material (p. 44); colonizes in sandy banks; host of Epeolus rufipes (fig. 19).

Fig. 11. Sphecodes subquadratus Smith: female; cuckoo of a species of Halictus; female hibernates like its host (p. 17).

Fig. 12. Halictus lencozonius Schr.: burrows in the ground; the host of Sphecodes pilifrons Thoms (p. 17).

Fig. 13. Vespa crabro L.: female (the Hornet), nests in hollow trees; host of the rare beetle Velleius dilatatus (p. 38).

Fig. 14. Vespa vulgaris L.: female: one of our commonest wasps; nests usually in the ground (p. 35); host of a peculiar beetle (Metœcus paradoxus) (p. 38)

Figs. 15, 16. Andrena fulva Schr.: male and female; the bee which burrows in lawns, etc. (p. 9); host of Nomada ruficornis var. signata (p. 15).

Fig. 17. Panurgus ursinus Gmel.: Female; legs loaded with pollen, burrows in hard sandy paths, etc. (p. 49). Males sleep curled up amongst the rays of yellow composite flowers.

Fig. 18. Nomada ruficornis L. var. signata: cuckoo of Andrena fulva (figs. 15 and 16).

Fig. 19. Epeolus rufipes Thoms: female; cuckoo of Colletes succinctus (fig. 10).

PLATE C

Fig. 20.—Megachile maritima Kirby: female; burrows in the ground, makes its cells of pieces of leaves, which it cuts out with its mandibles; host of Cœlioxys conoidea.

Figs. 21, 22. Cœlioxys conoidea Illig: male and female; cuckoo of Megachile maritima.

Fig. 23. Burrows of Megachile Willughbiella Kirby, in a piece of rotten willow; each burrow originally contained six cells, but two of the left-hand series have been lost.

PLATE D

Figs. 24 and 25. Anthophora pilipes F.: male and female. A spring bee, the male of which may often be seen in gardens, darting from flower to flower (p. 81); while the female collects pollen; it forms large colonies (p.