22. The remains of a feast; cells of Hypocrabro stir- 



picolus 92 



23. An elderberry twig containing the nest of Hypo- 



crabro stirpicolus 95 



24. The nesting site of Paranothyreus cingulatis .... 97 



25. Burrows of various forms made by Paranothyreus 



cingulatis 99 



26. Figure of female Paranothyreus cingulatis 101 



27. A clay bank where Xylocelia metathoracicus digs 



her burrows 103 



28. The burrow and cells of Xylocelia metathoracicus 106 



29. The burrow of Philanthus punctatus 113 



30. Nests of the mud-dauber, Sceliphron caementar- 



ium, and Chalybion caeruleum 120 



31. The opening to the burrow of Cerceris fumipennis 126 



32. A Sceliphron nest remodelled to suit the needs of 



Trypoxylon clauatum 136 



33. Alyson melleus, her burrow and prey 141 



34. The burrow of Tachysphex terminatus 146 



35. Notogonidea argentata, and her burrow 156 



36. Priononyx atratum 160 



37. Priononyx atratum filling her burrow 163 



38. Priononyx atratum pounding the soil with her head 164 



39. Two burrows of Priononyx atratum 171 



40. Priononyx thomae riding her locust home 177 



41. Priononyx thomae and Stizus unicinctus 183 



42. Cinders carried by Priononyx thomae 185 



43. Chlorion ichneumoneum, her burrow and prey. . . 195 



44. Twin-celled burrows made by an unknown locust- 



huntress 199 



45. The burrows of Sphex pictipennis 208 



46. Sphex pictipennis carrying a small caterpillar .... 210 



47. The position of egg of Sphex pictipennis on prey. 213 



48. A locality study by Sphex pictipennis 220 



xiv 



