1910.] FOSSORIAL WASPS OF AUSTRALIA. 335 



segments, the first broadly, the second narrowly ; apical segment 

 fuscous. Wings hyaline, broadly margined with pale fuscous at 

 the apex. 



Length 11 mm. 



3 . Very similar, but the emargination of the eyes which is 

 very feeble in the female is rather more distinct in the male. 

 The first dorsal segment of the abdomen is entirely covered with 

 cinereous pubescence. 



Length 6 mm. 



Hah. Mackay, Q. {Turner). 



Aporus immitis, sp. n. 



5 . Clypeus transverse at the apex, about three times as broad 

 as long. Eyes very widely and shallowly emarginate, a little 

 nearer together on the vertex than on the clypeus ; posterior 

 ocelli as far from each other as from the eyes. Antennae a little 

 longer than the thorax and median segment combined ; the third 

 joint of the flagellum long, nearly as long as the second. 

 Pronotum depressed anteriorly, about twice as broad as long, the 

 posterior margin very feebly arched. Median segment with the 

 sides parallel, rather broader than long, sloped posteriorly, but 

 not truncate. Abdomen subsessile, rather slender, the apical 

 segment pointed. Posterior tibiae spinose, anterior tarsi with a 

 rather feeble comb. Radial cell short and rather narrow, about 

 three times as long as the greatest breadth ; the second cubital 

 cell arched towards the radial nervure, the second abscissa of the 

 radius not more than half as long as the first ; both recurrent 

 nervures received by the second cubital cell, the first very near 

 the base, the second close to the apex ; cubitus of the hind wing 

 originating just beyond the transverse median nervure, almost 

 interstitial with it. 



Black, with cinereous grey pubescence as follows : on the 

 clypeus, front, margins of the pronotum, angles of the scutellum 

 and median segment, mesopleuras, and a broad transverse band on 

 the apical margin of the four basal segments of the abdomen ; 

 mandibles fusco ferruginous at the apex. Wings hyaline at the 

 base, fusco-hyaline towards the apex and along the nervures. 



Length 8 mm. 



Hah. Mackay, Q. {Turner). 



Differs from dngulatus Fabr. in the slenderer antennae, the 

 different proportion of the joints of the flagellum, the shorter 

 pronotum, the more gradual slope of the median segment, the 

 shorter second abscissa of the radius, the narrower radial cell, and 

 the much greater distance between the recurrent nervures. 



Aporus acer, sp. n. 



5 . Clypeus about three times as broad as long, slightly convex ; 

 the anterior margin very feebly and widely emarginate, almost 

 transverse. Eyes nearly parallel on the inner margin ; the 

 posterior ocelli almost as far from each other as from the eyes. 



