Diaparsus~\ 



BRITISH ICHNEUMONS. 



35 



DIAPARSUS. Thomson. 

 1369; (?) Diaparsis, Forst. Verb. pr. 



Rheinl. 1868, p. 149. 



I. (lEMlxus, Holmgr 



Thorns. O.E. 



Size not small. Head a little constricted behind the eyes with vertex 

 not smooth ; frons usually transversely elevated, face often strongly trans- 

 verse and cheeks not very short. Antennal flagellum of 9 with at least 

 twenty joints, the first generally longer than the not or hardly transverse 

 second. Thoracic notauli short but always distinct; basal metathoracic 

 area not short, very rarely with a central carina; sternauli always distinct, 

 more rarely abbreviated. Abdomen nearly always at least centrally red ; 

 basal .segment infrequently elevated, the second longer than broad with 

 the thvridii in both sexes elongate-triangular; terebra distinctly exserted 

 and usually elongate. Calcaria not very short. Wings with lower angle 

 of brachial cell closed and entire; apical abscissa of radial nervure not 

 deflexed and at least double length of the basal. 



This genus was split off by Thompson from the remaining species of 

 Thersilochus of Holmgren on account of its many-jointed flagellum, small 

 but distinct notauli, and the large elongate-triangular thyridii at base of 

 second segment. 



Table of Species. 



(2). I. Basal third of metathorax centrally 

 carinate, basal area wanting; ab- 

 domen black-marked red ; hind 

 femora dark ; terebra as long as 

 abdomen ; t^agellum of 9 21- 

 jointed 



(i). 2. Metathorax with no central longi- 

 tudinal carina, basal area usually 

 entire. 



(8). 3. Hind femora mainly or entirely 

 nigrescent. 



(5). 4. Head no broader than thorax, vertex 

 broad; ffagellum of 9 '^'^- 'ind in 

 (J 27-jointed ; terebra straight 

 and almost longer than abdomen ; 

 antennae basally and legs testa- 

 ceous, coxae mainl)' dark ; abdo- 

 men testaceous, basally and later- 

 ally nigrescent 



(4). 5. Head broad; antennae at least 25- 

 jointed; terebra not shorter than 

 abdomen. 



(7). 6. Abdomen black, with central seg- 

 ments only laterally red; legs red, 

 basally black ; terebra slightly 

 longer than abdomen 



(6). 7. Abdomen mainly red; terebra not 

 longer than abdomen 



(3). 8. Legs red or Havidous, usually with 

 only hind coxae partly black. 

 (10). 9. Eyes apically divergent, i.e. face 

 apically explanate ; eyes and 

 ocelli very large ; head not nar- 

 rowed behind, with vertex broad; 

 antennae basally pale and apic- 

 ally attenuate • • 5- (ilLVlFES, Grav. 



2. VEK.siTu.s, Holmgr. 



3. ERVrilROSTOMlTS, Gr. 



q. Ni iKnoR, Fill). 



