Omorga] BRITISH ICHNEUMONS. 145 



(17). 16. Second segment a third longer than 

 apically broad ; terebra half length 

 of abdomen .8. curshans, Iln/nigK. 



(16). I". Second segment hardly longer than 

 broad, nor terebra than first seg- 

 ment .9. lA'GUHRIN'A, /fi)l»lgr. 

 (i). 18. Abdomen, at least of y , red banded 

 or marked towards anus. 



(20). 19. Genal costa sinuate; abdomen red, 



usually only basally black . 10. MELANOsnci A, (irav. 



(19). 20. Genal costa not sinuate; abdomen 

 narrowly red. 



(24). 21. Segments two to seven only laterally 

 red. 



(23). 22. Hind femora only basally and apic- 

 ally black ..II. KX.SATOR, C/'/v/.-'. 



(22). IT^. Hind femora entirely black through- 

 out .12. TUMIDULA, Grav. 



(21). 24. Segments two to seven at mosc only 

 apically narrowly red. 



(26). 25. Apices of all segments, but first, 



narrowly red I3- -MULTICINCTA, Grav. 



(25). 26. Apex of second segmeiu alone 



narrowly red .14. KA.sciATA, liridg. 



1. mutabilis, Holmgr. 



Limncria mutabilis, Holmgr. Sv. Ak. Handl. 1858, p. 55 ; Brisch. Schr. Nat. 

 Ges. Danz. 1880, p. 149 et 1890, p. 66 ; Bridg. -Fitch, Entom. 1885. p. 105, s ? . 

 Omorga mutabilis. Thorns. O.E. .xi. 1125, c? ¥ . (?) Canipoplcx lincolatiis, 

 Ratz. Ichn. d. Forst. i. 93, ii. 82, iii. 84 ; cf. Brisch. Schr. Nat. Ges. Danz. 1880, 

 p. 150, cT ? . 



A black species with abdomen immaculate and the femora and tibiae 

 red, the hind ones at apex or base sometimes black; terebra hardly half 

 as long as the strongly compressed abdomen. Head transverse and 

 constricted posteriorly, with the frons subdeplanate and densely rugose- 

 punctate, the palpi and usually centre of mandibles testaceous. Thorax 

 with apical margin of mesosternum carinate, elevated and reflexed but not 

 bilobed ; metathorax somewhat coarsely subrugose and posteriorly dis- 

 tinctly excavate, with lateral areae discreted. Abdomen with only the 

 ventral plica piceous; postpetiole strongly convex and laterally rounded; 

 second segment longer than broad and third (juadrate ; terebra about 

 half length of abdomen. Legs red, with coxae and posterior trochanters 

 black ; hind tibiae apically and also sometimes basally nigrescent, their 

 tarsi infuscate. Wings with stigma dull testaceous and tegulae whitish ; 

 areolet petiolate and nervellus slightly geniculate. Length, 5-7 mm. 



It is rendered distinct in the strong and subrugose metathoracic sculp- 

 ture, unusually strongly narrowed vertex, often black mandibles, whitish 

 tegulae, and the rellexed but simple mesosternal acetabulae. Thomson 

 thought that perhaps Ratzeburg's species was a synonym of the present; 

 but Brischke, who bred it from Lophyrus phii in addition to the original 

 species of 'lortrix and Hypotiomeula liosts, seems to have known them 

 both and preserved their distinction. 



O. mutabilis is of common occurrence in Swedish woods and gardens 

 (Holmgr.); bred in Prussia from lutpi/haia pinipine/laria pupa (Brisch.); 

 in France from Conchylis ambigmlla ((Jauile); found at the Hague in June 



