63 
were desired. When a grub bearing an egg was found it was immediate- 
ly transfered, with soil, to an ounce tin-box, which was then filled to the 
very top with soil so as to enable the grub to make a new cell. It was 
found that the egg was seldom displaced by this proceeding, whereas if 
the parasite was in the larval stage the grub would usually rub the larva 
off in forming a cell. Also for a grub bearing a Tiphia larva, obtained 
Fic. 3. Tiphia larvae recently hatched Fic. 4. Tiphia punctata Rob., larva a 
and part of body still concealed few days old. 
by egg-shell. . 
in the field or elsewhere, if was safer, after placing it in a similar box, 
to use, instead of soil, a packing of loose, partially rotted, damp sphag- 
num moss, or very loose muck soil. When the Tiphia cocoon had been 
‘completed it was transferred to a box containing an earthen cell. Each 
parasitized grub removed from the box containing the Tiphia adult was 
Fic. 5. Mature Tiphia larva. 
replaced by a healthy grub and the Tiphia was fed honey water about 
every other day.* 
The life histories of the four common species studied at Lafayette 
are similar in many respects, and are as follows: The black digger- 
wasps 7. punctata and T. transversa, and probably T. vulgaris also, issue 
from the cocoons during the summer, more often during June and July 
*The writer takes this opportunity to acknowledge his indebtedness to Mr. 
D. G. Tower, who faithfully cared for the Tiphia experiments during the writer’s 
absence August 15-30, 1915, and to Messrs. F. A. Fenton and S, L. Mason, who 
performed similar services in 1916. 
