482 MR. R. E. TURNER ON [May 12, 



bands of silvery pubescence on the apical margins of the three basal 

 segments ; the pygidial area rather broadly rounded at the apex, 

 more than twice as broad at the base as at the apex, clothed with 

 sparse, stiff, black pubescence. The second ventral segment has a 

 a longitudinal carina from the base to the middle. The two 

 recurrent nervures are received very near together, just beyond 

 one-third from the base of the second cubital cell; the third 

 cubital cell is longer by one-third than the second on the radial 

 nervure. 



Black. Wings light fusco-hyaline, nervures black. 



Length 16 mm. 



Hah. Cairns, Queensland {Turner) ; February. 



The median segment is shorter and broader than in most 

 species of Notogonia, but otherwise it shows all the characteristic 

 points of the genus. 



Tachytes rubellus, sp. n. 



S . Clypeus closely punctured, depressed and shining at the 

 apex, the margin slightly recurved. Head closely and very 

 minutely punctured ; the front covered with shining white 

 pubescence, a deep longitudinal svilcus on the vertex broadened 

 just behind the posterior ocelli into a small triangular depression. 

 Eyes convergent above, separated on the vertex by a distance about 

 equal to the length of the first and second joints of the flagellum 

 combined ; the third joint of the flagellum of almost the same 

 length as the second. Thorax very miniitely and closely punc- 

 tured, the sides thinly clothed with Avhite pubescence ; the meso- 

 notum depressed in the middle anteriorly ; the median segment 

 about one-fourth shorter than the mesonotum, narrowed and 

 truncate posteriorly, a deep longitudinal sulcus on the surface of 

 the truncation. Abdomen shining, minutely punctured ; the apical 

 margin of the segments with interrupted bands of white 

 pubescence. The mesopleur?e, the sides of the median segment, 

 and the femora beneath with silvery pubescence. 



Black ; the mandibles, the anterior tibise beneath, the anterior 

 tarsi, the three orfour apical joints of the intermediate and posterior 

 tarsi, the spines of the tibite, and a spot at the apex of the inter- 

 mediate and posterior tibiae ferruginous ; the tegulae testaceous ; 

 the abdomen entirely ferruginous red, palei- on the aj)ical margin 

 of the segments. 



Length 7 mm. 



Hah, Port Darwin {Turner) ; December. 



Tachytes formosissimus, sp. n. (Plate XXVI. fig. 6.) 

 $ . Head, thorax, and median segment densely covered with 

 shining golden pubescence ; the clypeus transverse and finely 

 punctured, the anterior margin shining and without pubescence. 

 A longitudinal sulcus on the vertex behind the ocelli ; the eyes 

 convergent above, separated on the vertex by a distance slightly 



