1908. J AUSTRALIAN FOSSOEIAL WASPS. 503 



raised triangular plate, pointed at the apex, the seventh with 

 a longitudinal median carina ; the eighth segment terminating 

 in a short spine. Anterior tarsi simple, the basal joint with six 

 slender spines on the outer margin ; the intermediate tibiae not 

 seirate. 



Black ; the mandibles (except at the apex), the labrum, the 

 extreme base of the scape, the flagellum beneath, a spot on each 

 side on the front below the anterior ocellus, the posterior margin 

 of the pronotum very narrowly, the tegulae, the tibife and tarsi 

 beneath, and the femora beneath at the apex, testaceous brown ; 

 a narrow transverse band, broadly interrupted in the middle, on 

 abdominal segments 2-5 pale olivaceous grey. Wings hyaline, 

 nervures black. 



Length 13 mm. 



Hah. Port Darwin [Turner-) ; December. 



Allied to B. musca Handl., and also to B. atrifrons Sm., of 

 which it may possibly prove to be the male, but the species in the 

 group are very closely allied, and atrifrons will probably prove to 

 be distinct. 



Bembex tuberculiventris, sp. n. 



S . Eyes slightly divergent towards the clypeus. The clypeus 

 ■strongly convex at the base, very prominent at about one-third 

 from the base, thence almost vertically depressed to the apex, 

 shining and very sparsely punctured. Antennae inserted as far 

 from each other as from the eyes, the front between them with a 

 low longitudinal carina ; the seventh joint of the flagellum very 



Text-fig. 109. 



Bemhex, $ : second ventral segment. 



1. B.furcata Erichs. 2. B. tuberculiventris. 3. B. littoralis. 

 4. B. pahnata ^ra. 



feebly prominent at the base beneath. Mandibles tridentate, the 

 intermediate tooth very small and short. Head finely punctured 

 and clothed with long grey pubescence. Thorax and abdomen 

 very finely and closely punctured, the punctures on the ventral 

 segments larger and shallow ; second ventral segment longi- 

 tudinally carinate, the carina produced downwards into a large, 

 compressed prominence, curved anteriorly and truncate broadly at 

 the apex; the sixth segment with a flattened triangular plate, 

 prominent and bluntly pointed at the apex ; the seventh segment 



