248 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



From our i)reaeiit extensive knowledge of the rearings of the 

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

 erroneous and these Tortricids nuist have been accompanied by Dip- 

 terous hirvic overlooked by Ratzeburg. 



My riniyijaHier aphidis is recorded from an Aphis on Chevopodium 

 album, but we know now that some Aphides are parisitized by Cecido- 

 myiids and this apparent discrejiancy is thus explained. The species 

 is unquestionably a secondary parasite on some Cecidomyiid infesting 

 or living with the Ajihid. 



The ^ejiusAmitus Haldeman (=Zacrita Fiirster) is, however, aj)par- 

 ently a i)rinKiry parasite on the Aleyrodidw a family of H«)mopter(ms 

 insects allied to the Coccida', unless the Aleyrodidce have Dipterous 

 parasites not yet discovered. 



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



Anterior wing witli a distinct clavate .snbinarginal vein.. ..Tribe i. — Inostemmini. 



Anterior wing entirely veinless, nirely with indications of a suiimaiginal vein, if 



present very short, faint, and never clavate Tribe ii. — i'latygasterini. 



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 GENERA. 



FEMALES. 



Tarsi 5-jointed 2 



Tarsi 4-jointed, antennjB 8-jointed Iphetrachelus Hal. 



2. Antennae 10-jointed 3 



AntennjB 9-jointed Allotropa Forster. 



3. Wings without basal and median veins 4 



Wings with basal and median veins. v ^ ^ ., 



Mesonotum with faint or distinct furrows. 



Antennal club 3-jointed Metaclisis Forster. 



Antennal club 4-jointed Monockita Forster. 



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. 



Inostemma Hal. 

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

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



AcEROTA Forster. 



males. 



Tarsi 5-jointed - 2 



Tarsi 4-jointed; mesonotal furrows distinct; antennai 10-jointed, with whorled 



hairs Iphetrachelus Hal. 



. Antennae 10-jointed 3 



Antennae 9-joiuted, with whorled hairs Allotbopa Forster. 



