84 



BRITISH ICHNEUMONS. 



sometimes transverse, not oblique, and the gastrocaeli small but deeply 

 impressed ; third segment with a distinct basal impression. Legs often 

 with the femora stout and the calcaria long. The external nervure of the 

 areolet is often pellucid and rudimentary, but always traceable. 



The insects are small and often have a whitish dot or lunula at the 

 vertical orbits ; segments two to four or five very often red, and the anus 

 of the female is nearly always white, that of the male sometimes with two 

 or three white marks. 



Some species are closely allied to Stenidmeumon, but the head is much 

 less narrowed behind the eyes and towards the mouth ; the female 

 antennae are distinctly stouter and less attenuate ; the mesonotum is 

 shining and its notauli usually distinct ; the areola is usually broader 

 and less rectangular ; post-petiole never striolate and the gastrocaeli 

 generally deeper, never oblique \ the legs are stouter and the anus more 

 often and fully maculate. 



Care must be taken to see that the metathoracic spiracles are not circular 

 since the superficial resemblance with many species of the Phaeogenides is 

 very strong ; and in one or two instances these small ichneumons appear 

 at first sight to be related to Phygadeuonids. 



Table of Species. 



(2). I. Antennae not reaching second segment ; 



abdomen black i. ANATOR, /^:J(5. 



(i). 2. Antennae reaching second segment. 

 (4). 3. Scutellum with raised margin ; abdo- 

 men mainly black 2. GEMELLUS, 6';7?7/. 



(3). 4. Scutellum not margined ; abdomen cen- 

 trally red. 

 (6). 5. Pronotum with central tubercle ; anus 



white 3. RIDIBUNDUS, Grav. 



(5). 6. Pronotum without tubercle. 

 (16). 7. Thyridii large and obvious. 

 (9). 8. Coxae of $ white-marked, of $ scopu- 



liferous 4. SEXALBATUS, Wesin. 



(8). 9. Coxae of $, not white-marked, of 5 not 

 scopuliferous. 

 (11). 10. Carinae of post-petiole strong; areola 



transverse 5. TERGENUS, Grav. 



(10). II. Carinaeof post-petiole indistinct ; areola 



elongate. 

 (15). 12. Mesonotum black. 

 (14). 13. Extcrnalorbitsof(? not white ; 9 mouth 



red 6. INCUBITOR, Linn. 



(13), 14. External orbits of c? white; ? mouth 



white 7. BASIGLYPTUS, KriecJi. 



(12). 15. Mesonotum red 8. RUFIDORSATUS, Z.V/V(^. 



(7). 16. Thyridii small and transversely linear. 

 (26), 17. Sternauli half length of mesosternum ; 



anus not or hardly white. 

 (21). 18. Areola not rectangular. 



(20). 19. Areola cordiform 9. vacillatorius, 6^r«z/. 



(19). 20. Areola sub-triangular 10. HERACLEANAE, ^r/</^. 



(18). 21. Areola rectangular. 



(23). 22. Areola sub-quadrate 1 1. SEMIRUFUS, G"rrtz/. 



(22). 23. Areola transverse and narrow. 



(25). 24. Metathoracic spiracles oval 12. pulchellatus,^^/^^. 



