1908.] AUSTRALIAN FOSSORIAL WASPS. 487 



Tachysphex mackayensis, sp. n. 



5 . Clypeus finely punctured at the base, very coarsely and 

 closely punctured, the apical margin very nai-rowly depressed and 

 shining, very narrowly emarginate in the middle. Antennte 

 inserted a little further from the eyes than fi-om each other ; the 

 second joint of the flagellum twice as long as the first, but a little 

 shorter than the third or fourth. Eyes sepai'ated on the vertex 

 by a distance slig'htly greater than the length of the third joint 

 of the flagellum ; the posterior ocelli situated on a convexity with 

 a small depression behind them. Head opaque, very finely and 

 shallowly punctured ; the clypeus at the base and the front below 

 the base of the antennae closely, the front above the base of 

 the antennfe very sparsely, clothed with moderately long white 

 pubescence. Thorax very closely punctured ; the pronotum. 

 strongly depressed below the level of the meson otum, almost 

 vertical, a little higher in the middle than at the sides. 

 Median segment almost as long as the mesonotum, narrowed 

 towards the apex and vertically truncate posteriorly, opaque and 

 finely punctured-i"ugose, with a little scattered pubescence ; the 

 face of the truncation finely transversely striated, with a deep 

 median sulcus not reaching the apex. Abdomen opaque, covered 

 with extremely short grey pubescence, which is rather longer and 

 whiter on the depressed apical margin of the segments ; the 

 pygidial area shining, with large and scattered punctures, almost 

 pointed and rather narrow ; the ventral segments smooth and 

 shining. The posterior tibife are rather strongly spined, the comb 

 of the anterior tarsi is long but rather thin. The third cubital 

 cell is very long on the cubital nervure, reaching neai-ly two-thirds 

 of the way from the apex of the second cubital cell to the margin 

 of the wing ; the third transverse cubital nervure is much curved ; 

 the second cubital cell is longer than the third on the radial 

 nervure, but scarcely as long on the cubital. 



Black ; the tegula? and the comb of the anterior tarsi testaceous. 



Length 12 mm., exp. 19 mm. 



Hah. Mackay, Queensland [Tiirnei^). 



Allied to T. fortior described above, but the eyes are further 

 apart on the vertex, and the sulcus on the vertex is absent, the 

 mesonotum is punctured, the median segment longer and more 

 strongly narrowed posteriorly, the pygidium narrower, and the 

 posterior tibiee more strongly armed. 



Tachysphex walkeri, sp. n. 



5 . Clypeus shining, sparsely punctured, very finely at the base, 

 more coarsely at the apex, obliquely depressed from the middle to 

 the apex, where it is broadly truncate. Antennae long and slender, 

 nearly as long as the head, thorax, and median segment combined, 

 inserted further from the eyes than from each other ; the second 

 joint of the flagellum more than twice as long as the first and 

 about one-quarter shoi^ter than the third. Eyes separated on the 

 vertex by a distance not quite equal to the length of the second 



