348 MR. R. F. TURN T ER ON THE [Feb. 15, 



(excluding the yellow parts), and the tarsi ferruginous. Wings 

 hyaline with a faint fuscous cloud at the apex, nervures black. 



Length 7-8 mm. 



J . Similar to the female, but the clypeus is toothed at the 

 apex and not emarginate, the third joint of the flagellum is 

 distinctly longer than the second, the striee on the triangular 

 space at the base of the median segment are less distinct, the 

 sides of the pygiclial area are almost parallel and it is narrowly 

 truncate at the apex ; the sixth dorsal segment and a, transverse 

 band at the base of the second are yellow, the petiole black, the 

 tegulse yellow, and yellow replaces the ferruginous colour on the 

 anterior and intermediate legs. 



Length 6-7 mm. 



Hab. Mackay, Q. [Turner) ; Townsville, Q. (Dodd) ; Her- 

 mannsburg, Central Australia (Hillier). February to April. 



Tachysphex subopacus, nom. n. 



Tachysphex debilis Turn. Proc. Zool. Soc. 1908, p. 490 {nee 

 Perez, 1907). 



Key to the Australian Species o/" Tachytes. 



$ ?• 



A. Abdomen red or testaceous red. 



a. Abdomen red. Head and thorax black, without 



pile T. rubellus Turn. 



b. Abdomen testaceous red. Thorax covered with 



■ golden pile T. formosissimus Turn. 



B. Abdomen black. 



a. Pile of abdomen golden. 



a 2 . Tibise and tarsi black. Length 20 mm T. plutocratims. 



b 2 . Tibiae and tarsi ferruginous. Length 14 mm. . T. approximatus Turn. 



b. Pile of abdomen silver. 



a 2 . Stiff pubescence on p}'gidial area golden T. tarsatus Sid. 



b 2 . Pubescence on pygidial area silver T. austrcdis Sauss. 



I am not sure that my identification of australis is correct, 

 the description being poor and of the male only. I have not been 

 able to recognise T. tachyrrhosttis Sauss., of which the male only 

 has been described. T. australis Sauss. 1854 seems to be a Larra 

 and certainly does not belong to Tachytes. 



Tachytes tarsatus Sm. 



Tachytes tarsatus Sm. Oat. Hym. B. M. iv. p. 297 (1856), $ . 

 Hab. Mackay and Cairns, Q. Also from India. 

 I think I am correct in my identification of this species, but I 

 have not seen the type, and the species run very close in this genus. 



Tachytes plutocraticus, sp. n. 



$ . Clypeus very broadly rounded at the apex, finely and 

 closely punctured, the apical margin strongly raised, with a 

 narrow transverse depression before it. Head and clypeus 

 clothed with rather long, close, cinereous pubescence, which 

 changes to silver-white in some lights ; the head finely and 



