18 Mr. F. Walker on some British Chalcidites. 



VI. — Descriptions of some British Chalcidites. By Francis 

 Walker, Esq., F.L.S. 



Eurytoma tumida, mas et fern. Atra, brevis, gibbosa, alta, anten- 

 nis pedibusque nigris, genubus tarsisque rufis, alis limpidis, nervis 

 piceis. (Corp. long. lin. 1 ; alar. lin. If.) 

 Male. — Body convex : head and thorax roughly punctured : head 

 a little broader than the thorax : antennae setaceous, nodose, verti- 

 cillate- pilose, as long as the thorax ; first joint long, slender ; second 

 cyathiform ; third and fourth very minute ; fifth and following joints 

 hardly dilated, appearing more approximate than in the following 

 species, verticillata, Serratula, curta, Abrotani, apicalis, collaris, annu- 

 lipes, atra and Argele : thorax somewhat obconic : prothorax a little 

 narrower than the head, quadrate ; its breadth rather more than 

 twice its length : mesothorax more convex than that of the follow- 

 ing species, verticillata, Serratula, curta, annulipes, rufipes, Scultenna 

 and Sittace ; scutum large, broader than long ; sutures of the par- 

 apsides very distinct, approaching each other ; axillae or paraptera 

 large, triangular, separated above by a space nearly equal to the 

 scutum between the base of the parapsides; scutellum somewhat 

 conical, truncate in front, abruptly decumbent behind, and thus form- 

 ing nearly a right angle : metathorax very short, appearing trans- 

 versely after the hind border of the scutum : propodeon (usually 

 termed metathorax) large, obconic, furrowed distinctly along the 

 middle, but less clearly on each side, more abruptly decumbent than 

 in the following species, verticillata, Serratula, curta, Abrotani, an- 

 nulipes, rufipes, Scultenna and Sittace ; podeon slender, cylindrical, 

 punctured, as long as the propodeon : abdomen short-oval, smooth, 

 shining, much compressed, hardly longer than high, subtriangular 

 when viewed sideways (being flat beneath and forming above an 

 angle whose sides are convex), shorter than that of verticillata, Ser- 

 ratula and curta ; metapodeon large, having no channel ; octoon, 

 ennaton and decaton of moderate size; protelum, paratelum and telum 

 very short : wings broad ; humerus slender, much less than half the 

 length of the wing ; ulna thick, much less than half the length of 

 the humerus ; radius much shorter than the ulna ; cubitus as long 

 as the radius ; stigma small, emitting a short branch. 



Female. — Head as broad as the thorax : antennae shorter than the 

 thorax, thicker, shorter and more clavate than in the following species, 

 verticillata, Serratula, curta, annulipes, rufipes, Sittace and Argele ; 

 fifth and following joints to the ninth long, successively decreasing 

 in length ; club fusiform, twice the length of the ninth joint : podeon 

 much shorter than the propodeon : abdomen much longer than that 

 of the male, shorter than that of verticillata, Serratula and collaris, 

 fusiform, convex and keeled beneath, slightly compressed, its length 

 considerably exceeding its height ; segments from the metapodeon to 

 the decaton large above, much contracted on each side, approximate 

 and conniving together beneath ; metapodeon of moderate size ; oc- 

 toon, ennaton and decaton large ; protelum very short above, much 

 dilated on each side and concealing the ventral segments ; paratelum 

 and telum very short above but broader on each side. 



