DEVELOPMENT OF A HYMENOPTEROUS PARASITE How 
According to the author’s figure, mandibles are not present in 
this stage. 
The simplest type yet observed is that found in Polynema by 
Ganin and here called the embryonic larva because of its very 
primitive structure. It is unlike any of the types above men- 
tioned in that it hatches as a simple sac of cells without definite 
organization. During this stage its life is spent within the egg 
of Pieris brassicae. 
Ayers has given the name ‘spindle-shaped larva’ to the first 
stage of a species of Teleas. The projecting cephalic process, 
the dorsal spines and the single long caudal appendage, as well 
as the embryonic internal structure render this larval type easily 
distinguishable. It lives within the eggs of other insects and 
up to the present time has been observed only in the genu 
Teleas. ; 
The cyclopoid type is so well known through the researches 
of Ganin, Marchal and others that it hardly requires description. 
It exhibits considerable variation in structural details but the 
general scheme of organization is the same throughout. The 
body is divided into a large cephalothorax composed of the head 
and the first thoracic segment followed by a smaller segmented 
region. The caudal segment terminates in a bifurcated ap- 
pendage which .is variously serrated. Most striking is a pair of 
huge mandibles attached at the sides of the cephalothorax. The 
cyclopoid larva is an active entoparasite of very simple internal 
organization. 
The name ovoid larva is given to a type discovered by Marchal 
in Platygaster ornatus and another undetermined species belong- 
ing to the same genus. The name is descriptive of the shape of 
this larva which resembles some of the intermediate larvae in 
the Platygasteridae. Caudal appendages are absent and the 
mandibles are small. Metamerism is indicated ventrally. This 
larva leads an entoparasitic existence. 
The eucoilaform larva described by Keilin and de la Baume 
Pluvinel is superficially like the ‘spindle-shaped’ larva of Teleas, 
but lacks the dorsal bristles and has three pairs of ventral tho- 
racic appendages. It is an entoparasite and probably represents 
