488 MR. R. E. TURNER oj^ [May 12, 



joint of the flagellum ; the posterior ocelli subovate, situated on a 

 convexity, with a small triangular depression on the vertex 

 behind them. Head opaque, the vertex smooth, the front slightly 

 convex, finely shagreened, with a delicate, longittidinal, median 

 sulcus ; the space round the base of the antennas clothed with short 

 silver pubescence. Thorax suboiDaque, the scutellum shining; the 

 pronotum much depressed below the mesonotum, gradually sloped 

 anteriorly. Median segment as long as the mesonotum, narrowed 

 posteriorly, opaque and rather irregularly longitudinally striated, 

 the sides finely obliquely striated, vertically truncate posteriorly, 

 the face of the ti'uncation transversely striated, with a median 

 sulcus. Abdomen microscopically jounctured, the apical margin of 

 the thi'ee basal segments slightly depressed, with a band of short, 

 rather thin, silver pubescence ; the pygidial area polished, with a 

 few fine and scattered punctures, elongate triangular. The 

 posterior tibife very feebly spined, the coml) of the anterior tarsi 

 only feebly developed. Third cubital cell nari-ow, the third trans- 

 verse cubital nervui'e rather strongly curved inward ; the second 

 cubital cell much shorter than tlie third on the radial nervure, 

 the radial nervure strongly continued, the appendiculate cell being 

 clearly defined and reaching nearer to the outer margin than the 

 cubital nervure. 



Black ; the scape beneath f usco-fei'ruginous ; the apex of the 

 tegulas and the comb of the anterior tarsi testaceous. 



Length 7 nivn. 



Hah. Sand Islet, Long Eeef, N.W. Australia [Walker); June. 



Type in British Museum. 



Tachysphex pilosulus, sp. n. 



$ . Clypeus very broadly rounded anterioi'ly, clothed w-itli dark 

 grey pubescence, changing to silver in some lights, the apical 

 margin bare and recurved, with a shining transverse depression 

 before it. Antennae inserted about half as far again from the 

 eyes as from each other ; the second joint of the flagellum twice as 

 long as the first and about equal in length to the third and the 

 fourth singly. Eyes separated on the vertex by a distance 

 scarcely exceeding the length of the second joint of the flagellum ; 

 the posterior ocelli oblong and oblique, situated on a convexity, 

 with no depression or sulcus on the vertex behind them. Fi-ont 

 rather strongly convex, clothed with long and rather close silver- 

 grey pubescence, a very fine longitudinal sulcus below the anterior 

 ocellus. The whole head opaque, very minutely punctured. Pro- 

 notum very much depressed below the level of the mesonotum, 

 very steeply sloped anteriorly. Thorax and median segment 

 finely shagreened, opaque, with sparse and rather long cinereous 

 pubescence ; the mesonotum large, about half as long again as the 

 median segment, which is scarcely narrowed posteriorly, and ver- 

 tically truncate, the surface of the truncation indistinctly trans- 

 versely striate-rugulose, with an almost obsolete median sulcus. 

 Abdomen subopaque, the two apical segments and the whole 



