DEVELOPMENT OF A HYMENOPTEROUS PARASITE 521 
organs as a mere globular sac of cells. Following an ecdysis, the 
Histriobdella-like larva appears, having a superficial resemblance 
to the worm from which it has received its name. The third 
stage larva is also highly modified. Histoblasts of the mouth 
parts, antennae, wings, legs and ovipositor are visible, as well 
as a pair of lobate appendages on the sides of the last segment. 
The larval stages found by Ganin in Platygaster are comparable 
to the cyclopoid, intermediate and tertiary larvae described by 
Marchal. 
Ayers (’84) studied the Proctotrypoid, Teleas (species not 
determined) a common egg parasite of the tree cricket, Oecanthus 
niveus. Two distinct larval stages were observed and an indi- 
cation of a third, but the work was finished before this could 
be carefully elucidated. The first stage, the ‘spindle-shaped 
larva,’ has from five to eight segments along the equator of each 
‘of which is a series of spines. Ventrally, at the base of the 
caudal appendage, which is over half as long as the body, is 
a series of tooth-like projections. The head region is elongated 
in front to form a blunt process. There is a pair of hooked 
mandibles. This larva moves about in the egg by means of the 
rows of bristles, flexion of the tail and bending of the entire body. 
The second stage larva suggests the cyclopoid larva of Ganin 
and others. It possesses a pair of hooked mandibles with a 
peculiar beak-like labium lying beneath them. The abdomen 
terminates in a single long appendage, somewhat flexed upward 
like a telson. It is used in feeding. On either side of the body 
is a cuticular expansion the ‘fin pad,’ bearing numerous long 
bristles. The advanced second stage larva is very flat and has 
a large abdomen and smaller head region suggesting a third 
larval stage which is known in other Proctotrypoidea. 
What is probably the larva of a species of Teleas has been 
inadequately described by Lemoine (’88). 
Klapdlek (’89) described two well marked larval stages in the 
Agriotypid, Agriotypus armatus Curtis. The first, which he 
called the ‘larva,’ is figured as being elongate, distinctly seg- 
mented and possessing a curious medial constriction, behind 
which the body is enlarged and finally tapers off toward the 
