1908.] AUSTRALIAN FOSSORIAL WASPS. 505 



very broad, with eighteen long spines on the outer margins, the 

 second joints produced into a broad lobe on the outer margins, 

 but the third and fourth not so. The sixth joint of the 

 flagellum is produced iDeneath at the apex and the seventh at 

 the base, the latter very gradually narrowed towards the apex 

 with an emargination in the middle. The second ventral segment 

 is longitudinally carinate with a tubercle at the apex, less strongly 

 produced than in flavifrons tSm. The intermediate femora are 

 not toothed, and the epipygium is truncate at the apex. 

 Hah. Port Darwin {Walker). 



Bembex flavifrons Sm. 



Bembex flavifrons Sm. Cat. Hvm. B. M. iv. p. 324. n. 36, 

 1856, 2. 



Bembex saussicrei Handl. tSitz. Akad. ^Yiss. Wien, cii. p. 873. 

 n. 107, 1893, 2 . 



This may be distinguished from ^^eciiwipes Handl. by the 

 longitudinal grooves on the sides of the clypeus, feebly continued 

 on the labrum, and by a short median longitudinal sulcus at the 

 base of the labrum. 



c? . The clypeus is very deeply longitudinally grooved on the 

 sides, the grooves strongly continued on the labrum, which also 

 has a deep, median, longitudinal sulcus near the base. The 

 antennae have the sixth joint of the fla,gellum strongly produced 

 beneath at the apex and the seventh at the base. The anterior 

 tarsi have the first joints stronglf broadened and flattened, Avith 

 sixteen long spines on the outer margin, the following joints are 

 not strongly lobed. The intermediate femora are distinctly 

 serrated. The second ventral segment is very strongly longi- 

 tudinally carinated beneath, the carina produced at the apex into 

 a very prominent tubercle, more strongly developed than in 

 jiectinipes. The markings on the disc of the thorax are almost 

 obsolete, the band on the first abdominal segment very broadly, 

 on the other segments very narrowly interrupted. Epipygium 

 narrowly truncate at the apex. 



Hah. Mackay, Queensland {Tiirner). 



Nysson (Acanthostethus) punctatissimus, sp. n, (Plate XXYI. 

 fig. 9.) 



$ . Clypeus broadly truncate at the apex, the apical margin 

 narrowly transversely depressed, the angles very feebly produced ; 

 sparsely and rather deeply punctured, without carin;e, short and 

 broad. Antennte inserted nearly half as far again from the eyes 

 as from each other ; the scape as long as the first two joints of 

 the flagellum combined, the second joint half as long again as the 

 first and about the same length as the third, the fourth joint longer 

 and thicker, the apical joint nearly twice as long as the second. 

 Eyes separated at the base of the clypeus by a distance equal 

 to about one-third of the length of the antenna?, strongly diver- 

 gent towards the vertex and broadly and shallowly emai'ginate on 



