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dissected under a microscope, if he wishes to find the egg. The egg is 
found inside the seed in the semifluid albumen. Being translucent and 
almost colorless, the freshly laid tgg transmits the pale green color of 
the surrounding seed tissue and is inconspicuous ; but as one dissects 
the albumen carefully, the egg comes out like a lump of jelly, soft and 
delicate but sufficiently elastic to keep its form. The egg varies con- 
siderably in shape and must assume its definite form after leaving the 
ovipositor ; for the body of the egg is wider than the channel of the 
ovipositor, and no distension of the organ is seen during oviposition. 
It is to be inferred that the egg passes thru the ovipositor in the form 
of a long thread, the body part of the egg entering the seed first and at 
once expanding. The usual position of the egg in the seed, with the 
end of the appendage near the seed coats and the body of the egg 
farther away, indicates that the body entered first. The appendage 
probably serves as a reservoir for some of the egg-contents while the 
egg is going thru the ovipositor. This appendage is empty in the 
freshly laid egg, and within a day after the latter is laid the former 
shrinks and turns brown — then affording a ready means of locating the 
egg. Without a careful dissection this delicate appendage will be 
missed. 
The seeds in which the eggs are laid look sound and healthy and 
contain no other insect — so we have always found. 
The egg, dissected out of a seed, can be kept for some time in a 
glass tube, upon a piece of moist black paper or a fragment of albumen 
taken from the seed, and can be examined daily under the microscope 
in order to determine the egg period. We kept eggs in this way for 
thirteen days, after which they appeared to be dead. Another way is 
to take a large number of seeds from florets in which the females were 
seen to oviposit, and to dissect these at successively longer intervals 
from the time of oviposition, making sure that there is not more than 
one egg in each seed. By this method I found that eggs laid July 22 
were unhatched and apparently sound thirteen days afterward, but then 
the material gave out, and I do not yet know precisely the duration of 
the egg stage. 
The larva when full grown fills the seed, leaving only the shell 
intact. 
The adult emerges thru an irregular hole, generally at the top of 
the seed (as the seed stands in the calyx). In one instance I saw such 
a hole in the seed when the seed contained not an adult, but a pupa. 
The opening was no doubt made by the larva but was probably acci- 
dental — for among phytophagous chalcids in general the exit opening 
is bitten out by the adult, not by the larva. 
Natural Enemies. — In company with the seed-chalcid, there 
emerged frequently, in our jars of clover heads, a second black chalcid 
which might casually be mistaken for the first species, tho belonging to 
another genus — Tetrastichus. The species is T. bruchophagi Ashm. 
MS., as determined from specimens named by Ashmead himself, and 
obtained by Mr. R. L. Webster from Prof. Lawrence Brimer. The 
