272 HYMENOPTERA. 



This species is most nearly allied to A. tkoracica, but differs 

 in wanting the prominent angles at the anterior margin of the 

 face; the prothorax is of a different form and is differently 

 sculptured, and the abdomen is coarsely punctured ; inA. tkora- 

 cica it is smooth and shining. 



12. Ampulex hospes. B.M. 



Female. Length 12 lines. — Brilliant purple, with shades of 

 green in certain lights ; the head with scattered punctures, which 

 are closest and strongest towards the insertion of the antennae ; 

 the clypeus with a highly elevated carina down the centre ; an 

 abbreviated impressed line above the stemmata. Thorax : the 

 prothorax smooth and convex above, with a few delicate scat- 

 tered punctures ; the mesothorax, scutellum and post-scutellum 

 smooth and shining, with a few widely dispersed punctures ; the 

 disk of the mesothorax with two deeply impressed longitudinal 

 lines, extending from the anterior margin to the base of the scu- 

 tellum ; outside of each, close to the tegulse, is a deeply impressed 

 fovea; the wings fuscous; the femora red; the metathorax 

 rounded at the posterior angles, not spined, the upper surface 

 with two oblique broad longitudinal grooves, which are trans- 

 versely striated; the sides and posterior margin of the upper 

 surface smooth and shining ; the truncation smooth and shining ; 

 the sides have a transversely striated groove at their upper mar- 

 gin, below which they are punctured. Abdomen very smooth 

 and shining, much compressed at the sides; beneath suddenly 

 produced at the base of the second segment. 



Hab. Borneo (Sarawak). (Coll. A. R. Wallace, Esq.) 



This species in some particulars differs from those of the rest 

 of the genus : the antennae are stouter and shorter, as are also 

 the mandibles ; the wings, in the three females received, have only 

 two submarginal cells, but the obliteration of the first transverse 

 cubital nervure is of frequent occurrence in the genus ; the meta- 

 thorax is without spines at the posterior lateral angles, and the 

 abdomen is abruptly produced at the base of the second seg- 

 ment beneath : — these differences constitute a remarkable and 

 very distinct species; they cannot be regarded as of higher 

 value, as a good series of the different species of the genus 

 exhibit many approaches to the remarkable peculiarities of the 

 present species. 



