1908.] AUSTRALIAN FOSSORIAL WASPS. 511 



on the front. Eyes deeply emarginate, separated on the vertex 

 by a distance equal to the length of the two basal joints of the 

 flagellum, moi'-e than half as far again from each other at the base 

 of the mandibles ; the posterior ocelli very near the eyes, nearly 

 twice as far fi'om each other, but much nearer to each other than 

 to the anterior ocellus. Antennse inserted a little nearer to each 

 other than to the eyes ; the second joint of the flagellum more 

 than twice as long as the first and about one-third longer than 

 the third. Pronotum not much more than half as bi-oad as the 

 head, steeply depressed anteriorly, the posterior margin straight. 

 Thorax subopaque. Median segment almost smooth, very minutely 

 punctured, with very short striae at the base, and a very obscui-e 

 median carina from the base to the apex. Abdomen very minutely 

 punctured, the apical margin of the segments broadly depressed, 

 the second segment not depressed at the base. 



Entirely black ; the tegulae testaceous brown ; the pubescence 

 white on the iinier margin of the eyes below the emargination, 

 on the sides of the postscutellum, on the sides of the median 

 segment near the apex, and very sparsely on the sides of the 

 abdominal segments. Wings hyaline at the base, the apical two- 

 thirds fusco-hyaline ; nervures black. 



The recurrent nervures are almost interstitial with the first 

 and second transverse cubital nervures. The second cubital cell 

 extends more than halfway from the cubital to the radial 

 nervure ; the third is about three times as long on the cubital as 

 on the radial nervure. 



Length 7 mm., exp. 10 mm. 



Hob. Port Darwin {Turner) ; December. 



PiSON IGNAVUM, Sp. n. 



5 . Clypeus broadly rounded anteriorly, about twice as broad 

 at the apex as long, clothed with shining white pubescence. 

 Antennae inserted about the same distance from each other as 

 from the eyes, about twice as long as the mesonotum, thickened 

 to the eighth joint of the flagellum ; the second joint of the 

 flagellum a little shorter than the scape, fully twice as long as 

 the first joint of the flagellum and very slightly longer than the 

 third. Eyes deeply emai-ginate, about one-thii'd further from 

 each other at the base of the mandibles than on the vertex, the 

 distance between them on the vertex equal to about twice the 

 length of the second joint of the flagellum ; the posterior ocelli 

 nearer to each other than to the anterior ocellus, a little further 

 from each other than fi'om the eyes, with a depressed transverse 

 line on the vertex behind them. Head opaque, a very faint 

 longitudinal sulcus below the anterior ocellus, the front round the 

 base of the antennae and the inner orbits of the eyes as high as 

 the emargination clothed with shining white pubescence. Thoi-ax 

 minutely punctured ; the pronotum transverse, with white pubes- 

 cence ; the mesonotum more than half as broad again as long. 

 Median segment a little shorter than the mesonotum, broader at 

 Proc. Zool. Soc— 1908, No. XXXIII. 33 



