1908.] AUSTRALIAN FOSSORIAL WASPS. 523 



tudinal sulcus. Abdomen shining, very minutely punctured and 

 feebly pubescent ; the first segment very slender, slightly 

 thickened at the apex, longer than the second and third segments 

 combined. 



Black ; the posterior margin of the pronotum pale testaceous ; 

 tegulge and the spines of the tibia3 testaceous. Wings hyaline, 

 nervures fusco-ferruginous. 



S . As in the female, but the apical joint of the antennae is 

 longer and slightly curved near the apex, fully twice as long as 

 the second joint of the flagellum. 



Length, § 10-12 mm., c? 9 mm. 



Hab. Mackay, Queensland (Titi^ner); February and March. 



Yery near T. pileatiom Sm. from India,, but tlae frontal carinte 

 are much more strongly developed and the first abdominal segment 

 longer ; the sculpture of the median segment is also coarser, 



Trypoxylon placidum Sm. 



Trypoxylon placidimi Sm. Proc. Linn. Soc, Zool. vii. p. 35. n 1 

 1863! 



Hah. Mysole {Smith) ; Cairns, Queensland [Turner), April. 



Crabro (Rhopalum) militaris, sp. n. 



(S . Olypeus small, svibtriangular, Avithout a carina, without 

 spines on the anterior margin. Mandibles bidentate at the apex, 

 the inner tooth the longest. Head and thorax shining, minutely 

 punctured, the front smooth, the groove for the scape deep and 

 very narrowly separated from the eyes. Eyes almost touching 

 the base of the antennas, where they are separated from each other 

 by a distance equal to half the length of the scape. The second 

 joint of the flagellum half as long again as the first, Pronotum 

 not more than half as wide as the head, narrowed anteriorly, the 

 angles obtuse. Mesonotum broadly and very shallowly depressed 

 on the middle of the antei-ior half, with a very obscui-e longi- 

 tudinal carina in the depression ; the scutellum divided by an 

 obscure longitudinal carina. Mesopleurfe shining, a little more 

 strongly punctured than the mesonotum. Median segment steeply 

 sloped posteriorly, smooth and shining ; the longitudinal sulcus 

 dividing the triangular space at the base very shallow and obscure, 

 well-defined and deep on the posterior slojDe, Abdomen petiolate, 

 longer than the head and thorax combined, and slender ; the first 

 segment very nai-row and flat, swollen at the apex, longer than the 

 second segment, which is long and gradually broadened to the 

 apex, the fourth segment the broadest, Epipygium shining, very 

 narrowly truncate at the apex. 



Black ; the scape of the antennae, the anterior and intermediate 

 tibi?e and tarsi, and the apex of the femora yellow ; the apex of 

 the first abdominal segment, the second and third (except on the 

 apical margin), the posterior tibife and tarsi, and the apex of the 

 femora ferruginous. Wings liyaline iridescent, nervures black. 



