FOSSORIAL WASPS. 605 



24. PiSON MANDIBULATUM, Sp. n. 



2 . Nigra ; albo-pubesceiis ; clypeo a pice mandibiilisqiie ferru- 

 gineis ; alis hyalinis, apice l-eviter infuscatis, venis nigris; seg- 

 mento mediano oblique striate. 



c? . Feminse similis ; clypeo omiiino iiigro. 



Long., 2 9 mm., J 8 ram. 



5 . Mandibles very broad and short, not narrowed at the 

 apex ; clypeus in both sexes produced in the middle, but much 

 more distinctly so in the female than in the male. Eyes sepa- 

 rated on the vertex by a distance about three times as great as 

 the length of the second joint of the flagellum, on the clypeus by 

 about four times the length of the same joint; posterior ocelli 

 separated from the eyes by a distance fully equal to their own 

 diameter, a little further from the posterior margin of the head 

 than from each other. Antennae not very stout, the second 

 joint of the flagellum equal to the third, neai-ly twice as long as 

 the first. Head and thorax very closely punctiu-ed ; the frontal 

 sulcus very indistinct, the clypeus and front as high as the emar- 

 gination of the eyes clothed with silver pubescence. Median 

 segment obliquely striated on the whole dorsal surface ; the 

 median sulcus almost obsolete ; the median carina distinct, but 

 not reaching the apex ; the posterior slope transversely striated. 

 Abdomen finely and closely punctured ; the first segment mode- 

 rately constricted at the apex, second ventral segment evenly and 

 very distinctly punctured. The white pubescence on the abdo- 

 men is confined to the sides of the segments, and does not form 

 apical bands. Calcaria black. Second abscissa of the radius 

 shorter than the petiole of the second cubital cell ; recurrent 

 nervures interetitial with the transverse cubital nervures ; trans- 

 verse median nervure a little nearer to the base of the wing than 

 the basal nervure. 



Hah. Yallingup, S.W. Australia (Timmer), November and 

 December. 1 5 and 4 d" (5' . 



Easily distinguished from other black species by the colour and 

 breadth of the mandibles. It is remarka"ble that the clypeus is 

 much more distinctly pointed in the female than in the male. 



25. PisoN INFUMATUM Turn, 



Pison infumaticm Turn, ProG, Zool. See, London, p, 510 

 (1908),?. 



This little species may be recognised by the shining median 

 segment, on which the punctures are microscopic. 



Sab, Port Darwin {Turner\ December", 



26. PiSON PERPLEXUS Sm, 



Pison perplexiLS Sm, Cat. Hym, B, M, iv, p. 314 (1856), <? . 

 This differs from fuscij)ennis as indicated on the key by the 

 proportionate distance between the posterior ocelli and the eyes. 



