DEVELOPMENT OF A HYMENOPTEROUS PARASITE oD 
rows along each side of the body, but absent from the median 
dorsal and median ventral regions. The ‘semipupa’ here cor- 
responds to the third larval stage in Perilampus hyalinus and 
Spalangia muscidarum. 
Silvestri (08) observed two larval forms in the Chalcidoid 
Encyrtus aphidivorus Mayr. The first, 800, in length, is ovoid, 
with a well developed cephalic segment and mandibles and an 
elongate caudal segment quite comparable to that found by 
Ratzeburg in Anomalon. The second larval form closely re- 
sembles that found in Ageniaspis by Silvestri. 
Two larval stages are described in the Chalcidoid Ageniaspis 
fuscicollis prasincola Silvestri by Silvestri (’08). The first stage 
‘larvette,’ is small, 600 to 650y long, elongate, with a well defined 
cephalic segment and a short pointed caudal segment slightly 
curved dorsalwards at the tip. The second stage, ‘larve adulte’ 
is 1 to 1.5 mm. in length, has the cephalic segment shortened and 
the caudal segment greatly reduced. In general appearance it 
agrees closely with the usual hymenopterous larval type. 
Silvestri (’08) has recorded two larval forms in the Chalcidoid 
Oophthora semblidis Aur. The first stage larva is liberated 
within the egg of Mamestra brassicae L. and feeds directly upon 
the yolk. At this stage, it is of about equal dimensions ante- 
riorly and posteriorly, the stomenteron and proctenteron being 
relatively large. The author does not figure mandibles in this 
larva. The second stage or adult larva is larger posteriorily, 
has well developed mandibles and an enormous mesenteron, while 
the stomenteron and proctenteron are relatively small. 
Timberlake (’10) has made a study of the larvae of the Bra- 
conids, Praon simulans Prov. and Aphidius rosae Hal. (?) Three 
stages are present in both. P. simulans has a very unique first 
stage larva, the metathoracic and first to ninth abdominal seg- 
ments of which are provided with a series of bristles on the dor- 
sum and sides. The last abdominal segment bears a medio- 
dorsal, cylindrical appendage nearly as long as the preceding 
segment and a pair of ventral appendages which are smaller. 
Sharp, chitinized mandibles are present. The second stage larva 
is intermediate in size between the other two. The last two 
