180 
J. BRONTlS GATENBY. 
Oophthora la parte di esso, che prima si forma, deriva dalla 
parte spugnosa del protoplasma clie occupava, a blastoderma 
completo, il centro dell ovo. Intorno a tale differenza io 
pero non voglio insistere troppo perch e potrebbe essermi 
sfnggito il primo vero periodo di formazione dell' involucro 
embrionale nell' Encyrtus, mentre lio potuto seguirlo con 
ogni precisione nell' Oophthora.” 
In Encyrtus Silvestri gives several figures (vol. iii, 1908, 
p. 67) of the “inizio della psedoserosa,” which I find not 
unconvincing, but I cannot see any delamination taking place 
in fig. xxvi, 2, except at P., which I think has little in 
common with the “pseudoserosa” drawn in fig. xxv, 3. I 
will leave my comment at this point because Encyrtus is in 
some ways different from Trichogramma, and will consider 
Oophthora (vol. iii, pp. 71, 79). Whether Prof. Silvestri's or 
my views concerning these forms are correct, I am convinced 
that we have to deal with two species whose development is 
closely similar. I find stages such as those drawn by Silvestri 
in figs, xxxvii and xxxviii, and in almost all others of his 
figures. Not only this, but the modified larvae of both 
Trichogramma and Oophthora are similar. 
He believes that one part of the pseudoserosa is formed 
by the extruded inner mass (protoplasma superficial spug- 
noso), while the other is formed like that of Encyrtus, and is 
homologous with this membrane in the latter. 
In my figs. 15, 18, 19, 24, and 25 of PI. 11, I have drawn at 
EXN. what Silvestri calls the “ pseudoserosa.” Since read- 
ing the Professor's papers I have very carefully re-examined 
my sections, and find nothing to alter in my interpretations; 
but I have drawn PL 10, fig. 4, with a view to the clearer 
explanation of my view of the “pseudoserosa” of Silvestri. 
The egg when laid is surrounded by a vitelline membrane 
and a thin chorion, which, however, is quite distinct (PI. 10, 
fig. 6, CH.) As development goes on the waste nucleoli 
collect in the centre of the egg, and are soon extruded 
(Iff. 11, figs. 18 and 19). They come to the surface of the 
egg, and at first form a slight cavity in the ovum. But as 
