1908.] AUSTRALIAN FOSSORIAL WASPS. 515 



rather coarsely obliquely striated, with a rather ill-defined median 

 carina from the base to the apex ; the svirface of the posterior 

 truncation transversely striated, with a deep median sulcus. 

 Abdomen not quite as long- as the thorax and median segment 

 combined, almost smooth, the apical margin of the segments de- 

 pressed, with a little fine pubescence on the sides ; the first 

 segment subtruncate at the base, the second a little longer than 

 the first or third, transversely depressed at the base. 



Black ; the mandibles, palpi, antennfe (except at the extreme 

 apex), tegulse, tibiae, tarsi, the apex of the femora, and the abdo- 

 men (except the basal half of the first segment and the extreme 

 base of the second) ferruginous. Wings hyaline, nervures black. 



The first recurrent nervure is received by the first cubital cell 

 about one-fifth before the apex, the second at the middle of the 

 second cubital cell. The second cxibital cell does not reach quite 

 halfway to the radial nervure from the cubital nervure ; the thii-d 

 cubital cell is a little less than twice as long on the cubital as 

 on the radial nervure. 



Length 8 mm. 



Hah. Victoria (^French). 



In another specimen the second, third, and fourth abdominal 

 segments are strongly stained with black. The type was from 

 the Macintyre River, Queensland, and has much more black on the 

 abdomen. The specimen in the British Museum collection is from 

 that locality and is probably the type, though not marked. I have 

 taken the description from a Victorian specimen. In Queensland 

 specimens the eyes are nearly, if not quite, as far apart on the 

 clypeus as on the vertex. In specimens from Mackay the median 

 segment is much more finely striated and the abdomen is brighter 

 in colour a,nd entirely ferruginous. These differences, although 

 apparently constant, do not seem to me suflicient to deserve even 

 subspecific rank ; it is probable that connecting forms will be 

 found to occur in intermediate localities. 



PlSON MELANOCEPHALUM, sp. n. (Plate XXVI. fig. 12.) 



5 . Clypeus subtriangular, truncate at the base, convex, 

 obliquely triangularly depi-essed from the centre to the apex. 

 Head opaque, almost smooth, with a shallow longitudinal sulcus 

 reaching from the anterior ocelkis to near the base of the clypeus. 

 Eyes deeply and narrowly emarginate, convergent towards the 

 base of the antennae, where they are separated by a distance about 

 equal to the length of the scape of the antennae, separated on the 

 vertex by a distance neai-ly twice as great ; the posterior ocelli 

 nearly twice as far fi-om each other as from the eyes. Antenna? 

 inserted at the base of the clypeus, very close to the eyes ; the 

 scape short, about equal in length to the two basal joints of the 

 flagellum ; the second and third joints of the flagellum about equal 

 to each other in length, each more than half as long again as the 

 first joint, the apical joints slightly thickened. The eyes reach to 

 the posterior margin of the head. Pronotum about two-thirds of 



