Kinsey: The Genus Neuroterus 
19 
of data which would be too meager for use in some other 
genera. These predictions are, admittedly, very liable to be 
wrong in some cases, and are probably incorrect in details 
for all cases, but they will probably prove of much value if it 
is remembered that they are always liable to corrections from 
experimental data. ' There are many thousands of varieties 
of Cynipid^ in the world (most of them as yet undescribed) ; 
the experimental determination of a life history is a long 
and difficult matter; and if we are ever to know these his- 
tories, we may not reject any clue as to just where to look 
for the information. The predictions made in this paper are 
based on the following considerations: 
Alternating galls will be very similar in this genus ; they 
are not greatly different in the cases experimentally studied 
in the subgenus Spathegaster, and are practically identical 
in the cases known by direct observations in Diplobius and 
Dolichostrophus. 
Different plant tissues will be attacked as different tissues 
are^ most available at the season for oviposition of each gen- 
eration; the gall structure will in consequence vary to some 
degree. See the paragraphs on gall polymorphism. 
The hosts of the two generations will be the same; this 
is true for most of the life histories known thruout Cynipidse, 
and the exceptions are open to question. 
Only one faunal area will be occupied by the two genera- 
tions. This is obviously true. 
The, insects of each generation will be morphologically 
very similar or identical; they are very similar in the Euro- 
pean cases, and nearly identical in the American cases already 
known. 
An agamic female will differ from the bisexual female 
mainly in its slightly enlarged abdomen and the consequently 
greater length of the whole body and the proportionately 
shorter wings, and in ovipositor differences. These constitute 
the main differences in all the known cases. 
If one generation is agamic, the other bisexual, the agamic 
will occur in the fall and winter, the bisexual in the spring. 
This is true for most Cynipid^, and is true of all known cases 
in Neuroterus. 
Life histories within subgenera will be more similar than 
between subgenera, and will be most similar for all the vari- 
