13 THE ENTOMOLOGIST. 



ft Apex of metathorax prolonged tail-like beyond the base 

 of the hind coxae. - Gen. 9. Oronotus, Wesm. 



** Scutellum very convex and prominent. 

 '^ Metathorax short, supero-medial area transverse linear, 

 petiole rather long. - Gen. 10. Ectopius, Wesm. 



c^ooo Metathorax not short, supero-medial area not transverse 

 linear. 

 1st segment rather short. 

 o Apex of abdomen acute, aculeus of female quite straight. 



Gen. 11. Ischnus, Grav. 

 00 Apex of abdomen obtuse, aculeus of female curved 

 upwards. - - Gen. 12. Heterischnus, Wesm. 

 b. Spiracles situated in the middle of the 1st segment. 



Alomyia, Panz. 

 B. Wings without an areolet. - - Microleptes, Grav. 



These generic characters are not in all cases so precise as 

 could be wished, many of the species having consequently been 

 placed under more than one of the genera, as will be seen on 

 reference to the synonymy in Marshall's Catalogue. Note 

 especially the distribution of the ten species under Ischnus in 

 Gravenhorst's 'IchneumonologiaEuropsea.' Even the distinctive 

 mark of the subfamily itself — the circular metathoracic spiracles 

 — is shared by a few species which have already been noticed in 

 the last subfamily in the genera Platylahus and Apceleticus. 



Herpestomus, Wesm. 



A. Post-petiole closely punctured. 

 Gasti'ocasli very distinct. 



Black or brownish black, margins of segments piceous, antennse 



dark; greater part of legs red. - 1. hrunnicornis, 2^ — 3 lines. 



B. Post-petiole smooth and shining. 

 Gastrocteli hardly visible. 



Thorax witli pale line before the wings, apex of scutellum white ; 

 abdomen more or less red, femora and tibiae red ; female, antennae 

 with a pale ring (sometimes obsolete); male, front coxae pale, 

 hind black. u. facialis, 2 — 2^ lines. 



C. Post-petiole distinctly striated. 



Thorax black ; 2nd to 4th abdominal segments and legs red ; apex of 

 hind femora and tibiae black. - - - striatus, 2f lines. 



Four Gravenhorstian species are partly referable to H. 

 facialis. H. striatus, Bridgm., is a species new to science, both 

 sexes of which have been taken at Norwich (Trans. Ent. Soc. 



