144 



BRITISH ICHNEUMONS. 



[Omorga 



OMORGA, TJioiiisoit. 



Thorns. O.K. xi. IS87, 1125, 



Head posteriorly constricted and not triangular with genal costa little 

 inHexed, sometimes sinuately continuous apically; lateral clypeal foveae 

 small; mandibles not stout. Antennae with flagellum slender and scape 

 infrequently pale beneath. Thorax subcylindrical and pronotum striate 

 below; metathorax nearly always with costulae distinct and areola not 

 transverse. Abdomen rarely broadly pale-marked; basal segment with 

 no lateral sulci ; postpetiole always broader and obviously shorter than 

 petiole, usually ovate or laterally rounded, with no scrobes; second seg- 

 ment not shorter than broad, with no or obsolete thyridii; seventh of 9 

 almost invariably not excised; terebra strongly exserted, usually about 

 half-length of abdomen. Legs not stout with the hind femora not infre- 

 quently, and especially in the male, black or partly nigrescent; calcaria 

 very often inequal and not elongate ; unguiculi small. Wings with areolet 

 small and distinct, usually irregular and petiolate ; apical radial abscissa 

 obviously longer than the basal ; cubital nervure divergent ; nervellus 

 more or less distinctly oblique and usually geniculate below its centre. 



The outline and elongate terebra of this genus resemble Angilia ; it 

 may be known therefrom by the oblique position of the usually geniculate 

 nervellus, the lacking petiolar lateral sulci, discally convex and laterally 

 rounded postpetiole ; in the ?nu/abt7/'s-group of species, the metathorax is 

 centrally excavate, as in IJinnerium which does not possess the oblique 

 nervellus, the posteriorly constricted head, nor ovate postpetiole of the 

 present genus. 



Table of Species. 



I. Abdomen, at least of 9' dorsally 

 black throughout. 



Ventral plica infuscate ; metathorax 

 subexcavate. 



Metathorax subrugose and distinctly 

 excavate centrally 



Metathorax smoother and not deeply 

 excavate. 



Scape always pale-marked beneath in 

 both sexes. 



Anterior trochanters pale ; hind 

 femora red . . 



Anterior trochanters black ; hind 

 femora basally black 

 8. Scape not at all pale-marked beneath. 



Hind femora and tibiae pale ; 9 ''^g'" 

 ments 6 and 7 excised 



Hind femora basally and tibiae apic- 

 ally dark ; nervelet distinct 



Ventral plica stramineous ; meta- 

 thorax not excavate. 



Hind femora red ; stigma very pale 



Hind femora black ; stigma darker. 



Trochanterellus and centre of hind 

 tibiae white 



Trochanten'llus and tenlrc ut tibiae 

 not white. 



(9)- 



(2). 



(13)- 



(12). 



(15)- 

 (14)- 



I. MUTAHILIS. Him Sir 



2. Faunus, Hohngr. 



3. MOLESTA, Grav. 



4. DIFFORMIS, GdicI. 



5. RAM 1 1) U LA, Brisch. 



6. OVATA, Brisch. 



7. F.OREALIS, Zett. 



