1908.] AUSTRALIAN FOSSORIAL WASPS. 527 



opaque, almost smooth, the groove narrow and punctured. The 

 enclosed space at the base of the median segment coarsely longi- 

 tudinally rugose, the sides and apex of the segment obliquely 

 striate-rugose. Abdomen opaque, petiolate ; the first segment 

 very slender, twice as long as the second, a little swollen at the 

 apex, the second segment nearly as broad as the third. 



Black ; the scape of the antennae, a spot on each side of the 

 apex of the first abdominal segment, a broad band across each of 

 the remaining segments and the wdiole of bhe seventh, the tibiae, 

 tarsi, and the apex of the femora ochraceous yellow. Wings 

 hyaline, iridescent ; nervures f usco-ferruginous. 



The I'ecurrent nervure is received by the cubital cell beyond 

 two-thirds from the base. 



Length 7 mm. 



Hah. Cooktown, Queensland {Turner) ; November. 



CeABKO (RHOPALUHr) IDONEUS, sp. n. 



5 . Head and thorax opaque, very delicately punctured-rugu- 

 lose ; mandibles bidentate at the apex, the teeth short, the inner 

 tooth the longest ; maxillary palpi five-jointed, labial palpi three- 

 jointed. Clypeus transverse, slightly produced in the middle of 

 the anterior margin. Front concave, the antennae inserted nearer 

 to the eyes than to each other. Pronotum transverse, rounded 

 at the angles ; mesonotum with a depression from the middle of 

 the anterior margin to the centre ; the scutellum half as long as 

 broad. Median segment very short, rounded, and truncate 

 posteriorly ; the space at the base longitudinally striated at the 

 base, almost smooth and opaque at the apex, with a median carina 

 extending on to the surface of the truncation to the apex. Abdo- 

 men petiolate, very minutely punctured ; the petiole about half 

 as broad as long, of even length throughout, n.early as long as 

 the second segment, which is slightly narrower than the third. 

 Epipygium deeply punctured, lanceolate. 



Black ; the clypeus, cheeks, the truncation of the median seg- 

 ment, and the fourth and fifth abdominal segments clothed with 

 pale golden pubescence ; the mandibles fusco-ferruginous : the 

 flagellum (except the basal joint), the tegulfe, the first abdominal 

 segment, the pygidium, the apical margins of the other abdominal 

 segments, the posterior tibiae and tarsi, and the posterior femora 

 above ferruginous ; the scape of the antennae, the basal joint of 

 the flagellum, the pronotum very nari-owly interi'upted in the 

 middle and on the sides, the scutellum (except the apical margin), 

 a transverse line on the postscutellum, the anterior and inter- 

 mediate legs, and the posterior tibiae beneath yellow. "Wings 

 hyaline, iridescent, clouded in the radial cell ; nervures ferruginous. 



The recurrent nervure is received by the cubital cell at three- 

 fifths from the base. The radial cell is very broadly truncate at 

 the apex, the radial nervure indistinctly produced beyond the cell. 

 The eyes are separated at the Uase of the antennae by a distance 

 equal to about three-quarters of the length of the scape ; the 



Proc. Zool. Soc— 1908, No. XXXIY. 34 



