1908.] AUSTRALIAN FOSSORIAL WASPS. 485 



Eyes separated on the vertex by a distance equal to the length of 

 the first two joints of the flagellum ; the jjosteidor ocelli situated 

 on a convexity, divided by a fine longitudinal sulcus, with a rather 

 large, shallow, subtriangular depression on the vertex behind 

 them. Head opaque, the vertex very finely and closely punctui^ed, 

 the depression behind the ocelli smooth and shining, the front 

 very delicately rugulose, slightly raised in the middle above the 

 base of the antenna?, where it is divided by a longitudinal sulcus ; 

 the front almost flat. Thorax subopaque, very closely and deli- 

 cately punctured ; the pronotum not very much below the level 

 of the mesonotum, and very gradually sloped anteriorly. Median 

 segment opaque, a little shorter than the mesonotum, very finely 

 rugulose, truncate posteriorly, with a deep median sulcus on the 

 face of the truncation. Abdomen shining and ahnost smooth, the 

 three basal segments depressed on the apical mai'gin, narrowly at 

 the sides, broadly in the middle ; the pygidial ai-ea elongate and 

 pointed, shining, with scattered punctures. The tibiae are very 

 feebly spined ; the comb of the anterior tarsi is long, but thin. 

 The third transverse cubital nervure is rather feebly curved. 



Black ; the apical joint of the tarsi fusco-ferruginous ; the two 

 basal abdominal segments above and beneath bright ferruginous 

 red. Wings hyaline stained with fuscous, nervures fuscous. 



Length 9 mm. 



Hah. Queensland. 



Type in Oxford University Museum ex coll. Saunders. 



Allied to T. riifo-niger Bingh. from India. 



Tachysphex imbellis, sp. n. 



$ . Mandibles incised on the outer margin ; clypeus shining, 

 very sparsely punctured, the punctures large, feebly convex, the 

 apical margin subtruncate. Head, thorax, and abdomen shining 

 and almost smooth ; a very delicate longitudinal sulcus reaching 

 from the anterior ocellus nearly to the base of the clypeus ; the 

 posterior ocelli subovate, situated on a very slight elevation, with 

 a small and fairly deejD depression on the vertex behind them ; 

 the eyes separated on the vertex by a distance about equal to the 

 length of the first two joints of the flagellum. Antennee inserted 

 nearer to each other than to the eyes ; the second, third, and fifth 

 Joints of the flagellum nearly equal in length, each less than twice 

 as long as the first, the fourth joint very slightly longer than the 

 others. Pronotum depressed below the mesonotum, a little more 

 than half as wide as the head. Median segment at the base a little 

 more than half as broad again as long, at the apex only as broad 

 as long, opaque and finely shagreened, almost vertically truncate 

 posteriorly, the face of the truncation finely and obscurely trans- 

 versely striated Avith a deep rounded depression at the base. The 

 apical segment of the abdomen shining, finely and very sparsely 

 punctured, pointed at the apex. The comb of the anterior tarsi 

 is veiy poorly developed, the setae being very few and far apart. 

 The third cubital cell is not much extended on the cubital nervure, 



