Heterofiyna and Fossorial Tlymcnoptera. 285 



anterior and intermediate tibiae and tarsi in both sexes 

 yellow, except a black spot on the nnder side of the 

 tibiae ; posterior tibiae black ; narrowly pale at the base. 

 Head and thorax somewhat dull, very finely punctured, 

 the puncturation only visible under a strong lens ; meso- 

 thorax with a short, double, impressed line from the 

 middle of the anterior margin ; wings hyaline, with a 

 very faint cloud along the radial cell ; metathorax with a 

 somewhat heart-shaped basal area, enclosed by a wide, 

 well-defined consute line, the enclosure punctured and 

 finely sulcate down the middle ; from the apex of the 

 enclosure runs a deeply-impressed channel ; abdomen 

 shining ; apical segment above m the 3' smooth, scarcely 

 punctured, in the ? acuminate, and carinated at the 

 sides with a trilobate fovea at the apex ; anterior femora 

 in the J fringed with long hairs beneath ; posterior tibias 

 in both sexes very clavate ; the outer margins irregularly 

 dentate. 



Length 6 mill. 



Hah. — Generally distributed. 



The exceedingly fine puncturation of the thorax will 

 distinguish this from any other of its group. 



8. aphidum, St. Farg. Ann. Soc. Ent. Fr. iii. p. 789 

 — Walkeri, Shuck., Smith, &c. 



Black ; clypeus, mandibles, and the scape of the 

 antennae, yellow ; thorax with a spot on each side of the 

 collar, the tubercles and tegulae yellow; scutellum and 

 post-scutellum in the ? generally with a yellow spot, 

 often wanting in the S ; S- with the anterior and inter- 

 mediate legs, except the base of the femora above, yellow; 

 posterior legs, with the base of the tibiae widely, and 1st 

 joint of the tarsi, yellow. The ? has the anterior knees 

 only yellow, and a black spot on the tibiae of the anterior 

 and intermediate legs. Head and thorax punctured; 

 clypeus covered with shining, silvery hairs ; metathorax 

 with a shining basal area, crenate at the extreme base, 

 bounded by a consute line, and divided down the middle 

 by a consute impression ; abdomen regularly ovate, finely 

 punctured, and clothed with a somewhat sparse grey 

 pubescence ; tibiae in the 3 without spines or teeth on 

 their outer margin. 



Length 7 mill. 



Hah. — Very rare. I have Shuckard's type of the S , 



