304 Mr. R. E. Turner on Fossorial Ilymenoptera. 



is also more distinctly rounded at tlie apex than in 

 dispersus ; also by the shorter median segment and the form 

 of the clypeus. From cestuans it is easily distinguished by 

 the much narrower pygidial area and the number of spines 

 on the basal joint of the fore tarsus. 



9. Tachytes dispersus, sp. n. 



5 . Nigra ; unguiculis tarsalibus tegulisque brunueis ; segmentis 

 dorsalibus 1-4 fascia lata apicali argenteo-pilosa ; area pygidiali 

 argenteo-pilosa ; alis hyaliuis, venis nigris. 



c? . Feminae similis. 



Long., $ 13 mm., J H mm. 



$ . Clypeus clothed with silver pubescence at the base, a 

 bare, somewhat deflexed triangular area at the apex, the 

 apical margin truncate. Second joint of the tlagellum 

 slightly longer than the third, more than twice as long as the 

 first ; eyes separated on the vertex by a distance equal to the 

 length of the third joint of the tlagellum. Front, pronotum, 

 mesopleurse, and the sides of the mesonotum and of the 

 median segment clotiied with silver pubescence ; mesonotum 

 distinctly depressed in the middle of tlie anterior margin, 

 minutely and closely punctured ; median segment more 

 opaque than the mesonotum, more than half as lung again as 

 the scutellum, with an obscure median sulcus from base to 

 apex, the sulcus becoming broad and deep on the posterior 

 slope. Abdomen subopaque ; the apical fasciae of pubes- 

 cence broad, especially on the sides; pygidial area elongate- 

 triangular, almost pointed at the apex. Basal joint of the 

 fore tarsus with five spines on the outer margin. Second 

 abscissa of the radius a little longer than the third ; first 

 recurrent nervure a little nearer to the second recurrent than 

 to the first transverse cubital nervure. 



Hab. Baudin Island, N.W. Australia (/. J. Walker) ; 

 Townsville, Q. {Dodd) ; Mackay, Q. {Turner) ; Perth, W.A. 

 {Turner) ; Port Fssington, N.T. {Gould). 



This seems to be the commonest Australian species of the 

 genus, and ranges over almost the whole continent. ' Tlie 

 silver pubescence of the pygidial area and the narrower and 

 more pointed shape of the same area distinguish it from 

 other Australian species, 



10. Tachytes sulcatus, sp. n. 



2 . Nigra ; tarsorum articulis duobus apicalibus fusco-ferrugineis ; 



