1910.] FOSSORIAL WASPS OF AUSTRALIA. 261 



median segment combined, rather stout, the apical joints slightly 

 arcuate, the prominence between the antenna? not developed. 

 Head rather coarsely punctured, more finely and closely on the 

 front than on the vertex ; no transverse carina,, but the front is 

 sharply depressed a little in front of the anterior ocellus. Pos- 

 terior ocelli about two and a half times as far from the eyes as 

 from each other. Thorax closely punctured ; the scutellum rather 

 narrowly truncate at the apex, convex. Median segment rather 

 short, more finely punctured. Abdomen fusiform, shallowly and 

 not very closely punctured, the punctures rather larger than on 

 the thorax ; the segments slightly constricted at the base, with a 

 sparse fringe of short white hairs on the apical margin. Seventh 

 dorsal segment more deeply and coarsely punctured, rounded at 

 the apex. Hypopygium ending in a recurved spine which does 

 not reach far beyond the dorsal segment, without lateral spines. 

 Second recurrent nei vure received at the base of the third cubital 

 cell, not quite interstitial with the second transverse cubital 

 nervure ; second abscissa of the radius a little shorter than the 

 third. 



Black ; the legs fuscous. Wings pale fusco-hyaline, nervures 

 fuscous. 



Length 13 mm. 



Bab. Cape York, Q. (Baemel). 



Type in Berlin Museum. 



Daemel's localities are not always accurate, and may have to be 

 corrected in the future. 



The present species is very distinct, the very broad short clypeus 

 and strongly bidentate mandibles distinguishing it from other 

 species of the genus. The fusiform abdomen and the short 

 hypopygium point to a connection with the next-described species, 

 inter stitialis. 



Rhagigaster interstitialis, sp. n. 



S . Clypeus short and broad, opaque and punctured, clothed 

 with long grey hairs, with a low carina from the base, branching 

 in the middle and forming a A-shaped carina which reaches the 

 anterior margin. Antennas as long as the thorax, stout and of 

 almost even thickness throughout. Head rugose, broader than 

 the pronotum, with an oblique carina above the base of each 

 antenna ; without a transverse frontal carina. Thorax and median 

 segment finely and closely punctured, most closely on the median 

 segment ; mesopleurae rugose. Pronotum a little narrowed ante- 

 riorly, the angles not prominent. Scutellum almost triangular, 

 very narrowly rounded at the apex, the sides strongly depressed. 

 Median segment shorter than the pronotum, subtruncate or 

 very steeply sloped posteriorly, the posterior surface striolated. 

 Abdomen as broad as the thorax, stout, about one-third longer 

 than the head and thorax combined, very finely and closely punc- 

 tured ; segments 2-5 with a depressed transverse line near the base 

 and a low transverse carina emarginate posteriorly in the middle 



