338 MEMOIRS OF THE CARNEGIE MUSEUM 



united and conically produced or conic-ovate ; while the marginal vein is very long, 

 the stigmal vein minute. In the females the tarsi are 5-jointed or heteromerous, in 

 the males 4-jointed. The antennae are 1 1-, 12- or 13-jointed, with 1 or 2 ring-joints, 

 the funicle being 6-jointed. 



In the other tribes the tarsi are 4-jointed in both sexes, the antennae having at 

 the most 10 joints, while the funicle is from 2- to 5-jointed. 



The members of this tribe attack principally coleopterous larvae. 



TABLE OF GENERA. 



1. Females ; tarsi 5-jointed or heteromerous 2 



Males ; tarsi 4-jointed 6 



2. Antennae 12- or 13-jointed, with 1 or 2 ring-joints 3 



Antennae 11-jointed, without a ring-joint 5 



8. Antennae 12-jointed ; mesonotal furrows distinct 4 



Antennae 13-jointed, with 2 ring-joints, the scape slender, the club 3-jointed, the funicle 6-jointed, the 

 joints long, cylindrical ; mesonotal furrows wanting. 



Platynocheilus Westwood (type P. erichsonii Westw. ) 



4. Antennae with the scape stout, the flagellum filiform, the joints cylindrical ; stigmal vein very short with 



a very small knob Tetracampe Forster (type Entedon panyas Walk.). 



Antennae with the scape slender, the flagellum subclavate, the joints except 5 and 6 a little longer than 

 thick ; stigmal vein short but with a rather large rounded knob...Plutothrix Forster (type unknown). 



5. Scape not thick, the pedicel about as long as funicle-joints 1 and 2 united, the fifth joint stout ; pronotum 



as long as the mesonotum, the axillae widely separated ; metanotum without a median carina. 



Forsterella Dalla Torre (type Hyperhius flavipes Forst.). 



6. Antennae 1 1 - or 12-jointed ; marginal vein normal 7 



Antennae 13-jointed ; marginal vein broad and stout Platynocheilus Westwood. 



7. Antennae 11-jointed 8 



Antennae 12-jointed. 



Flagellum not verticillate-pilose ; stigmal vein with a minute knob Tetracampe Forster. 



Flagellum verticillate-pilose ; stigmal vein with rather a large knob Plutothrix Forster. 



8. Antennae with the scape broad, the pedicel long, the flagellum normal ; stigmal vein very short. 



Forsterella Dalla Torre. 

 Tribe II. Omphalini. 



Many of the species falling in this tribe strongly resemble some in the Tetracam- 

 pini, in venation, in the shape of the body and in often having the abdomen 

 conically produced, the only appreciable difference being in the antennse ; these are 

 never more than 10-jointed, and the funicle is at the most 5-jointed, often 2-, 3- or 

 4-jointed. 



The habits of the species, if the records are correct, are diverse. Some attack 

 the larvse of Coleoptera, while others attack those of Diptera, Lepidoptera, etc. 



I am inclined to think, however, that these records in some cases are wrong and 

 most of them will be found to be parasitic only on dipterous larvae, since, where 



