248 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



From our present extensive knowledge of the rearings of the 

 Platygasterids it is, however, quite evident that these records are 

 erroneous and these Tortricids must have been accompanied by Dip- 

 terous hirvie overlooked by Ratzeburg. 



]\Iy riatuf/aster aphidis is recorded fi\>m an Aphis on Ghenopodinm 

 album, but we know now that some Aphides are parasitized by Ceci<lo- 

 myiids and this apparent discrepan(;y is thus explained. The species 

 is unquestionably a secondary parasite on some Cecidomyiid infesting 

 or living with the Aphid. 



The geiMisAmitvs Haldeman ( = Zacrita Fiirster) is, however, appar- 

 ently a i)rimary parasite on the AJeyrodidw a family of Homopterous 

 insects allied to the Coccida', unless the Aleyrodida- have Dipterous 

 parasites not yet discovered. 



The riatygasterina^ may be divided into two tribes as follows: 



Anterior wing with a distinct clavate snbniarginal vein.. ..Tribe i. — Inostemmini. 



Anterior wing entirely Acinless, rarely with indications of a siilimargiual vein, if 



present A'ery short, faint, and never clavate Tribe ii. — Platygasterini. 



Tribe I. — Inostemmini. 



In this tribe but seven genera are known, all represented in our 

 fauna, and distinguished by the aid of the following table- 



TABLE OF CIENERA. 



FEMALES. 



Tarsi 5-jointed 2 



Tarsi 4-jointed, antenna* S-jointed Iphetrachelus Hal. 



2. Antenna? 10-jointed 3 



Antenna* 9-jointed Allotropa Ffirster. 



3. Wings without basal and median veins 4 



Wings with basal and median veins. 



Mesonotum with faint or distinct I'lirrows. 



Antennal club 3-jointed Metaclisis Forster. 



Antennal club 4-jointed Monocrita P'cirstcr. 



4. Lateral ocelli nearer the apical ocellus than to the inner margin of eye. 



Mesonotum without or with delicate furrows; antennal club 4-jointed. 



IsosTASius Forster. 

 Lateral ocelli nearer the inner margin of eye than to the apical ocellus. 

 First abdominal segment with a horn ; mesonotum with faint furrows. 



Ixostemma Hal. 

 First abdominal segment without a horn; mesonotum with distinct ftirrows; 

 antennal club 4-jointed, the funiclar joints slender, cylindric. 



AcEROTA Forster. 



MALES. 



Tarsi o-jointed 2 



Tarsi 4-j ointed ; mesonotal furrows distinct ; antenna? 10-jointed,with whorled 



hairs Iphetrachelus Hal. 



2. Antenna? 10-jointed 3 



Anteunse 9-jointed, with whorled hairs Allotropa Forster. 



