106 MAUD D. HAVILAND 
The number of eggs laid by a smgle Ly go ¢ erus is uncertain, 
but from observations made on females in captivity, and from 
dissections of mature ovaries, it does not appear to be more 
than fifteen or twenty, at most twenty-five. Calculation by the 
latter method is difficult, as the eggs do not all mature at the 
same time; and if the hosts be removed from the cage of a 
captive female, and restored two or three days later, she will 
recommence and complete oviposition. 
Tur Kae. 
The egg of the hyperparasite, when newly laid, is elliptical, 
and measures °25 x:10 mm. It is white and semi-translucent, 
with a minute protuberance at one end. Under the high power 
TEXxtT-FIG. 2. 
The egg immediately after oviposition. x 100. 
of the microscope, the chorion shows numerous longitudinal 
striae. ‘Treatment with Aman’s lacto-phenol and cotton-blue 
reveals the presence of bodies resembling the symbiotes of the 
‘ pseudo-vitellus ’ of aphides. The egg is laid upon the upper 
surface of the host’s body, and hatches in abovt twenty hours. 
As the development of the embryo proceeds, the egg becomes 
more spherical, and the jaws, gut, &e., of the future larva are 
visible through the chorion. 
First STAGE LARVA. 
Dimensions -45 x -22. mm. 
The larva of the first instar is white and transparent, with 
a distinct head and thirteen body segments. The form is 
cylindrical, the greatest diameter being through the thorax, and 
the segments diminish regularly to the last which bears the anus. 
If removed to a slide, the larva can progress fairly actively by 
