T/ursi/flchus'] BRITISH ICHNEUMONS. 49 



more nitidulous pleurae and the length of the radial branch ; in conform- 

 ation it is similar to Diaparsiis thouj>h the abdomen is more coarctate 

 and the thvridii are distinctly small. 



Helijium in July and August, 1*' ranee, Prussia and on tree-trunks in 

 central and southern Sweden. Kigncll tells us (Ichn. of S. Devon, 38) 

 that he captured this species on 2nd September at Exeter. On 24th 

 August, if)o8, 1 took on the flowers of A/ii^^t/ica svhus/ns growing in the 

 open marshes of Barnby Broad in north Suffolk five females which 1 can 

 ascribe to nothing but the present species, though they differ somewhat 

 materially in having the scape and the i8-jointed llagelhun— no author 

 states the number of joints — entirely testaceous and very distinctly stout, 

 though agreeing with Thomson's account in being all well discreted; 

 the terebra, too, if not unnaturally protruded, is shorter than the basal 

 segment. 



10. marginatus, Bridg. 



Thcrsilochiis marginatus, Bridg. Trans. Ent. Soc. 1SS6, p. 354 ; Thorns. O.E. 

 xiii. 1391, ? . 



Head almost broader than iihora.x, dull, finely punctate and posteriorly 

 constricted; clypeus distinctly discreted, apically broadly rounded and 

 mouth rufescent. Antennae filiform and somewhat elongate, with scape 

 rufescent; flagellum with twenty-six distinctly discreted joints, of which 

 the first is at least twice longer than broad. I'horax dull and little longer 

 than high ; lower half of mesopleurae finely rugose and the upper smooth 

 with fine and sparse puncturation; metathorax more coarsely sculptured 

 than mesonotum, with basal area about twice longer than broad and petio- 

 lar area discreted. Abdomen only slightly compressed, with the second 

 segment apically and the following laterally below rufescent; basal seg- 

 ment slightly curved with postpetiole about twice longer than broad ; 

 second segment discally subquadrate and terebra two-thirds length of 

 first segment. Legs testaceous with only the hind coxae nigrescent. 

 Wings h3aline, with stigma and nervures nigrescent; radial branch ex- 

 tending almost to apex of wings ; recurrent emitted beyond areolar 

 nervure. Length, 4-4.5 mm. Male unknown. 



Similar and allied to T.jocator, but with the antennae basally flavous 

 beneath, the flagellum filiform and longer with the joints well discreted 

 and the second oblong, the basal metanotal area oblong-quadrate, 

 wings with the radial appendage longer and extending nearly to their 

 apices, the stigma entirely black, areolar nervure shorter, basal segment 

 nearly double length of terebra, the second apically margined with and 

 remaining S(,'gments laterally red; it seems to difier from T. Iripaili/us, 

 Brisch., in little but the terebral length, which I consider a very pertinent 

 feature. 



Schm. has recently often taken tliis species in Thunngia, but Thom.son 

 did not find it in Sweden and we have only the record of the three 

 females, originally described by liridgman, which were captured by 

 Bignell at Bickleigh Woods in Di^vc.n on idth September, 1884. 



