. On the instincts and habits of the solitary wasps . PLATE VIII. Nests of Ammophila uinaria, % natural size. Figs. 3-4. Nests of Ammophila urnaria, natural size. Fig. 5. Caterpillar with egg of Ammophila urnaria. Fig. 6. Nest of Cerceris nigrescens, tunnel 33^ inches long. Fig. 7. Nest of Oxgbelus quadrinofafus, natural size. Fig. 8. Side view of spider: A, nervous system. (After Emerton.) WISCONSIN GEOL. AND NAT. HIST. SURVEY. BULLETIN NO. II. PL. IX.

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