-oS- 



The genus Philachyra Haliday I have not mentioned as I think it 

 cannot be separated from Isosoma. Of Aiolomorfhus Walker, I can form 

 no definite opinion. 



Subfamily TRIDYMINAE. 

 Antenna inserted slightly above the clypeus, which is rounded and produced at the 



apex. Parapsides plainly shown *Genus Tridymus Ratzeburg. 



Antenna 1 inserted at the middle of the front. Clypeus plain, not produced. Anten 

 nae with both ring joints visible. 

 Parapsides plain. Front impressed with very many dots. 



Wings ciliate at apex Genus Semiotellus Wcstwood . 



Wings not ciliate. Thorax slighty rugose-punctate. . . . *Genus Systasis Walker- 

 Parapsides not plain *Genus Metasteuns Walker' 



Subfamily SPALANGINAE. 



Body aeneus, wings with a short marginal vein *Genus Isocratus Foerster. 



Body wingless or with a long marginal vein. 



Body not at all or very slightly metallic. Frenum not discernible. 



Body not metallic; mesonotum opaque, punctate; abdomen conieo-subulate. 



*Genus Tricoryphus Foerster. 

 Mesonotum submetallic, polished. . 



Body winged; metathorax strongly punctate. *GenusCerocephala Westwood. 

 Body winged or wingless; metathorax smooth; mandibles of usual size. 



*Genus Theocolax Westwood. 

 Body winged, mandibles very large, three times the length of the head. 



*Genus Paralaesthia Cameron. 

 Body metallic; antennas inserted in the anterior margin of the oblong head. Fren- 

 um large, distinct Genus Spalangia Latr. 



Subfamily PIRENINAE. 

 Wings with post marginal and stigmal very short. Ventral valvules not reaching to 

 anus. Antenna; short, clavate; at least the two first funicle joints annuliform. 

 Antenna with two ring-joints. Eyes of male strongly converging above. 



Genus Macroglenes Westwood. 

 Antenna with at least three ring-joints. Scutellar frenum horizontal. 



Genus Pirene Haliday. 

 Postmarginal and stigmal veins long. Ventral valvules reaching to anus. Antenna 



with one or no ring-joints. Terebra exserted *Genus Henicetrus Thomson. 



Postmarginal and stigmal veins moderately long. Ventral valvules not reaching to 

 anus. Antennae with no ring-joints. Terebra not exserted. Abdomen with a 

 large tuft of hair each side of petiole Genus Dilophogaster Howard.* 



Subfamily TETRACAMPINAE. 



Mesopleura not divided. ^ tarsi 4-jointed. Marginal vein long, narrow 



*Genus Tetracampe Foerster. 

 Mesopleura divided. $ tarsi 5 -jointed, Marginal vein large, black, oblong-oval.... 



*Genus Platynochilus Westwood. 



* This name is proposed as a substitute for Tomocera, a genus founded by the 

 writer in 1880—; ^nn. Rept. Com. Agr. 1880, p. 368, as the name first given conflicts 

 with the genus Tomocerus of the order Collembola. 



