Heterogyna and Fossorial Ilymennptera. 257 



labriim produced into a simple point, and the posterior 

 tibire simple. 



(4) 1. MesopleurfB with two horizontal crenate Hues at 



right angles to the perpendicular one. 



(3) 2. Face with a spine between the anteuute . . . . cornigera. 



(2) 3. Face without a spine . . . . . . . . . . insignis. 



(1) 4. MesopleuriB with only one horizontal crenate line 



at right angles to the perpendicular one. 



(6) 5. Labrura black . . . . . . , . . . . . gracilis. 



(5) C. Labrum white . . .. .. .. .. .. moniUcornis. 



1. cornigera, Shuck. ? nee c? . Foss. Hym. p. 191 =Mi- 

 signis, Shuck. <? nee ? . 



Black ; <? with the tubercles and tegulae pale ; the 

 mandibles, palpi, and basal joint of the antennae in front 

 flavous ; the tibiae, tarsi, and extreme apex of the femora 

 testaceous, the posterior tibiae with a dark cloud across 

 the middle. ? resembling the <? , but having the 

 mandibles, &c., pitchy brown instead of flavous. Head 

 and thorax finely punctured, more or less shining, the 

 former nearly square on the vertex, face below the 

 antennae silvery, between the antennte armed with a 

 sharp spine in both sexes, first joint of antennae large and 

 conical ; thorax very closely punctured, in front with two 

 impressed longitudinal lines, extending not quite to the 

 centre of the mesothorax, and with two smooth, slightly 

 raised lines between them ; the sides of the mesothorax 

 are margined by a consute impression, and they have a 

 longitudinal impressed straight line on their disk ; there 

 is also a consute impression between the mesothorax and 

 scutellum ; sides of the mesothorax below the wings with 

 two longitudinal consute impressions, united in front by 

 a transverse one ; metathorax elongate and clathrately 

 rugose ; abdomen finely and rather closely punctured, 

 the posterior margins of the segments narrowl}' red ; 

 apical segment in the c? with an upturned curved pro- 

 cess. 



Length 6 — 7 mill. 



Hah. — London district, &c. ; not rare. 



I have followed Thomson and other continental authors 

 in considering the <? and ? with frontal spines as sexes of 

 the same species. On what grounds our English hyme- 

 nopterists, Shuckard and Smith, separated them, I 



