49- The cocoons of Sphex pictipennis 235 



50. Ammophila procera asleep on a dried stem 243 



51. The nest of Polistes 287 



52. A nest of Polistes annularis among the branches. . 289 



53. Vespula germanica thick as flies on a freshly re- 



moved rooster's head 296 



54. The turret over the burrow of Odynerus geminus 300 



55. A burrow of Odynerus geminus 301 



56. A collection of mud-pellets carried out of the bur- 



row by Odynerus geminus 303 



57. Five burrows made by Odynerus geminus 308 



58. Odynerus dorsalis, her burrow and her method of 



lowering the prey 313 



59. The course of flight of Odynerus dorsalis to her 



water puddle 316 



60. The burrow of Odynerus dorsalis 317 



61. Two burrows of Odynerus dorsalis 319 



62. An unusual Odynerus nest 321 



63. The mandible-marks on the tunnel left by Ody- 



nerus dorsalis 322 



64. All that remained after O. dorsalis feast on Pholi- 



sora catullus caterpillars 327 



65. The nest of Odynerus pedestris 333 



66. Odynerus foraminatus and her home in a log. . . . 335 



67. The nest of Odynerus foraminatus in an elderberry 



stem 338 



68. The burrows of a mining bee in a clay bank, some 



of the tunnels used by Ancistrocerus fulvipes . . 342 



