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away with it and placed it upon a little seedling plant two and a 
half inches in height. She circled about it so as to impress the 
locality in her memory and flew away in search of a suitable 
place to make a burrow. Soon coming back, she perched the 
spider upon another weed, commenced one hole, but abandoning 
this work, examined the spider once more, and going to another 
spot twenty to thirty feet away from her prey, she began dig- 
ging for good, at9 a.m. She bit out much of the soil and used 
her forefeet also in excavating. At 9:22 a. m. the burrow was 
about complete. It was nearly vertical and only about 1% 
inches deep. Batozonus now returned to the spider, grasped it 
by one of the hind legs and swiftly backed away with it towards 
the burrow. On her way thereto she encountered a cast-off skin 
of a spider; this she charged furiously for some seconds, and 
after this ridiculous performance resumed her journey. Halting 
about eleven feet from her burrow, she pulled her prey six 
inches up on a fallen twig, placing it in a fork; this act was care- 
fully done, for the wasp saw to it, by quick pulls at the spider, 
that the latter was in a secure position. She resumed her digging, 
but visited the crotch several times to see that the spider was 
unmolested, and at 9:35 a. m. dragged the spider down and to 
within two inches of the burrow. Soon she seized it by the 
base of one of its legs and backed down into the hole and out of 
sight with it, the passage being a tight fit. Batozonus remained 
below for a few seconds only for the act of laying her egg, and 
could presently be seen, her head almost on a level with the sur- 
face of the ground; she was engaged in filling up the burrow, 
tamping down the soil vigorously with the end of her abdomen. 
This tamping was done with such a rapid motion that the wasp 
was seen to fairly vibrate in a longitudinal plane. “She bit off 
the top edges of the burrow and sometimes brushed in a little 
soil with her forefeet, then tamped again. Tamping was long- 
sustained and constituted by far the principal filling operation, 
being very effective in making a firm blending core of soil. When 
the burrow was but little filled, the tamping insect was in an 
approximately vertical position. The tamping process was fin- 
ished at 10:09, when Batozonus commenced backing over to the 
nest-site, carrying in her jaws lumps of soil and other material 
wherewith to conceal the position of the burrow. 
I caught this wasp and dug up the spider, which lay on its 
side, practically immovable at the bottom of the burrow. The 
wasp’s egg was placed longitudinally on the abdomen, tar to one 
side of the mid-ventral line, near the base. It was pearly white 
and polished, a very little thickest below its middle length and 
more rounded posteriorly. Moderately stout, it was gently curved 
