1910.] FOSSORIAL WASPS OF AUSTRALIA. 275 



and closely punctured, with sparse white pubescence ; the pro- 

 notum very broadly and shallowly emarginate on the anterior 

 margin, which is slightly raised ; mesonotum nearly twice as long 

 as the pronotum ; scutellum shining and sparsely punctured. 

 Median segment short, steeply sloped posteriorly, but not truncate, 

 very closely and finely punctured. Abdomen elongate, as long as 

 the head and thorax combined, the sides almost parallel from the 

 base ; the segments very strongly constricted at the base, shining 

 and sparsely punctured. Sixth ventral segment with a spine on 

 each side at the apical angles. Hypopygium ending in three 

 long spines, the central spine the longest. Seventh dorsal 

 segment coarsely punctured, the apical margin raised and slightly 

 produced towards the middle. Second cubital cell twice as long 

 as the third on the radial nervure ; the second recurrent nervure 

 received close to the base of the third cubital cell, almost inter- 

 stitial with the second transverse cubital nervure. 



Black ; the mandibles at the base, the apical margin of the 

 clypeus, a line on each side on the anterior margin of the pro- 

 notum, and the postscutellum pale creamy white ; the two apical 

 abdominal segments ferruginous red. Tegula? creamy white at 

 the base, testaceous at the apex. Wings hyaline, nervures black. 



Length 9 mm. 



Hab. Hermannsburg, Central Australia (H. J. Hillier). 



Very near sanguinolentus Turn, from Liverpool, N.S.W., but 

 the median segment in the present species is more rounded, not 

 truncate, and is more finely punctured. The third cubital cell 

 in sanguinolentus is fully as long as the second on the radial 

 nervure. Also near decipiens Westw., but differs in the broadly 

 emarginate pronotum, the shape of the clypeus, and the presence 

 of whitish markings. The second recurrent nervure is more 

 nearly interstitial than in either of the species mentioned. 



Tmesothynnus platycephalus, sp. n. 



d . Clypeus convex, punctured, produced and rather narrowly 

 truncate at the apex. Head rather small, closely punctured- 

 rugose ; the interantennal prominence not well developed ; a very 

 delicate longitudinal frontal carina not reaching the anterior 

 ocellus. Antennas no longer than the thorax without the median 

 segment, of nearly equal thickness throughout, the apical joints 

 very feebly arcuate beneath. Thorax finely and closely punctured ; 

 the pronotum short, narrowed anteriorly, the anterior margin 

 slightly raised ; scutellum strongly convex. Median segment 

 rounded, very finely and closely punctured, the extreme base 

 smooth and shining. Abdomen as long as the head, thorax, and ' 

 median segment combined, tapering a little at the extremities, 

 the segments strongly constricted at the base, the apical margins 

 narrowly depressed, punctured at the base, smooth and shining 

 at the apex. Hypopygium short, projecting very little beyond 

 the dorsal segment, with a long apical spine, a short spine on 

 each side often concealed beneath the dorsal segment. Second 



18* 



