144 
species of the genus and with sylvan forms of Sceliphron, Eu- 
menes and Pseudagenia, frequents muddy portions of forest 
trails, where she gathers mud to partition off her spacious cells. 
The two nests which I found were in bamboo twigs lying on the 
floor of a little ravine. Their dimensions were as follows: 
No. 1—Bore of bamboo, 13-15 mm.; inside 
length of cells, 24, 12, 22) 22-31, 20) 3434 
and 47 mm.; 12 spiders; total length of cells, 
27S Ti, 
No. 2—Bore of bamboo, 8-10 mm. ; inside 
length of cells; 25,217, 25, 14,31 and 32. mim 
6 spiders; total length of cells, 155 mm. 
The discs of mud partitioning off the cells 
were thin and dish-shaped; two are illus- 
trated in Fig. 75. Most of the cells. were 
provisioned with one or two attid (jumping ) 
spiders, some of which were of fair size, 10 
Fig. 73. Trypoxylon ™™. OT SO long, and several of the more 
elongatum, 2, X 2. recently captured, capable of moving their 
mouth parts. 
For so slender an insect the Trypoxrylon (8s is comparatively 
short and stout; it measures about 2 by 0.65 mm., is slightly 
curved along the spider’s abdomen, w ioe it is secured length- 
wise, and a little more broadly rounded at the head end, which in 
this case points towards the tip of the spider’s body. It is white 
with a yellowish tinge, and rather polished. 



Fig. 74. Full-grown 
larva of T. elon- 
gatum, X 3/2. 





Fig. 75. Cell and cocoon of T. 
elongatum in bamboo stem, x 
» » 
VF 
a/e 
In its younger stages the wasp grub may feed in an arched 
position, 1. e., with the middle portion of the body held clear of 
its victim; this seems due to the fact that as it increases in size 
