1910.] FOSSORIAL WASPS OF AUSTRALIA. 327 



a distance about equal to the length of the first joint of the 

 fiagellum, their inner margins converging towards the vertex, 

 where they are separated by a distance about equal to the length 

 of the second joint of the fiagellum ; posterior ocelli a little 

 further from the eyes than from each other. Front not raised at 

 the base of the antenna?, which are not very stout, a little longer 

 than the thorax and median segment combined ; second joint of 

 the fiagellum long, nearly as long as the third and fourth 

 combined. Pronotum broadly arched posteriorly, the apex of the 

 arch forming a slight angle, the sides almost parallel, the anterior 

 angles scarcely rounded. Median segment shorter than the 

 scutellum, about twice as broad as long, with a deep median sulcus, 

 steeply and obliquely sloped posteriorly. Abdomen almost smooth, 

 the three basal segments slightly shining ; second ventral segment 

 without a transverse furrow. Second abscissa of the radius half 

 as long again as the third ; second cubital cell receiving the first 

 recurrent nervure near the apex, third receiving the second 

 recurrent nervure near the middle ; transverse median nervure 

 interstitial with the basal ; cubitus of hind wing interstitial with 

 the transverse median nervure. Tarsal ungues with one tooth ; 

 anterior tarsi with a comb. 



Black ; head, prothorax, and mesonotum closely covered with 

 white pile, a narrow line across the vertex behind the ocelli with- 

 out pile. Wings dark fuscous. 



Length 22 mm. 



Hob. Strelley River, N.W. Australia (H. M. Giles). 



The white pile renders this species very conspicuous. 



: Axoplius senex, sp. n. (Plate XXXII. fig. 8, $ .) 



$ . Clypeus slightly porrect, transverse at the apex, more than 

 twice as broad as long. Eyes separated from the base of the 

 mandibles by a distance not quite equal to the length of the first 

 joint of the fiagellum, their inner margins converging towards 

 the vertex, where they are separated by a distance not quite equal 

 to the length of the second joint of the fiagellum. Antennae a 

 little longer than the thorax and median segment combined ; the 

 second joint of the fiagellum more than half as long again as the 

 third. Head moderately thick ; a very faint frontal sulcus reach- 

 ing the anterior ocellus. Pronotum scarcely more than half as 

 long as the mesonotum, the anterior angles slightly rounded ; the 

 posterior margin arched, without an angle. Median segment 

 more than half as broad again as long, with a deep median sulcus, 

 almost vertically truncate posteriorly, sloped gradually to the base 

 of the truncation. Abdomen subsessile, the second ventral seg- 

 ment without a transverse sulcus. Fore tarsi with a long comb ; 

 tarsal ungues with one tooth, not bifid. Second abscissa of the 

 radius very little longer than the third ; first recurrent nervure 

 received close to the apex of the second cubital cell, second 

 received at the middle of the third cubital cell ; transverse 

 median nervure almost interstitial with the basal nervure : 



