84 ]Mr. R. E. Turner on Fossorial IJymenoptera. 



tridentate at the apex^ the middle tooth very blunt, and 

 almost more of an angular apex to the segment than a tooth. 

 Hind tibise feebly serrate. Second recurrent nervure inter- 

 stitial with the first transverse cubital nervure, second 

 cubital cell petiolate, the petiole extremely short. 



Hab. Yallingup, 8.W. Australia ; January. 



In colour this resembles tasmanicus, but is distinguished 

 by the spines on segments 3-5 and the shape of the seventh 

 dorsal segment. There is also a fringe of long hairs on the 

 apex of ventral segments 2-5 in the present species^ but not 

 in tasmanicus, 



Nysson {Acanthosteihus) gilberti, sp. n. 



5 . Nigra ; mandibulis basi, scapo subtus, flagello articulis duobus 

 basalibus, tegulis, segmento dorsali prirao dimidio basali, segmento 

 sexto, pedibusque ferrugineis ; segmento mediano angulis apicali- 

 bus segmentisque dorsalibus linea angusta apicah aureo-pilosis ; 

 alis hyalinis, venis nigria. 



J . Feminse similis, segmentis dorsalibus primo secundoque linea 

 apicali angusta flava. 



Long., $ 8 mm., S 7 mm. 



? . Clypeus almost truncate at the apex, with an acute 

 spine on each side. Head and thorax coarsely punctured ; 

 basal segment of the abdomen strongly, the other segments 

 rather finely punctured ; pygidial area rugulose. INIedian 

 segment as long in the middle as the scutellum, the basal 

 area coarsely but irregularly longitudinally striated. Second 

 ventral segment not angular at the base. Second recurrent 

 nervure received close to the apex of the first cubital cell, 

 not quite interstitial with the first transverse cubital 

 nervure ; second cubital cell with a sliort petiole. Hind 

 tibiae feebly serrate. 



(J . Seventh dorsal segment with an apical spine on each 

 side, the space between the spines very feebly rounded ; 

 third to fifth segments without spines at the apical angles; 

 segments 2—5 with an apical fringe of long hairs ; second 

 recurrent nervure interstitial with the first transverse cubital 

 nervure ; second cubital cell pointed, not petiolate. 



Hub. Cairns, N. Queensland (Tamer) ; December to 

 February. 



I think I have associated the sexes righth^, the slight 

 ditit'erences in the neuration do not appear to be of specific 

 importance. 



The female is the type. 



