^908.] AUSTRALIAN FOSSORIAL WASPS. 525 



with shining white pubescence, truncate on the apical margin, 

 convex at the base, with an oblique semicircular truncation at the 

 apex, the truncation smooth and shining, without pubescence. 

 Antennae inserted close together, touching the eyes ; the second 

 joint of the ilagellum longer than the first. Eyes just above tlie 

 base of the antenna? separated by a distance about equal to the 

 length of the second joint of the flagellum ; the posterior ocelli a 

 little further from the eyes than from each other and about the 

 same distance from the posterior margin of the head as from each 

 other. Head smooth and shining, the posterior margin broadly 

 emarginate. Thorax smooth and shining, the pronotum narrowed 

 anteriorly ; the median segment I'ounded posteriorly, shining and 

 very minutely pvinctured, with a median sulcus from the base. 

 Abdomen elongate, shining and minutely punctured ; the first 

 segment very long and slender, of almost even thickness throuo-h- 

 out, the second and third gradually broadened, the fourth the 

 broadest. The recuri-ent nervure is received at the middle of the 

 cubital cell, the transverse cubital at about one-third from the 

 base of the radial cell. 



Black ; the mandibles and a mark on each side of the third 

 abdominal segment rufo-testaceous ; the .scape of the antennae, the 

 apex of the tegulas, the tubercles at the poster-ior angles of the 

 prothorax, and the anterior and intermediate tibite and tarsi pale 

 yellow; the four apical ventral segments testaceous. Wino-s. 

 hyaline, nervures black. 



Length 4 mm. 



Hah. Mackay, Queensland {Turner) ; May. 



Crabro (Rhopalum) teansiens, sp. n. 



(S . Clypeus broadly rounded at the apex, without a carina, 

 very feebly convex, and clothed with short silvery j)ubescence. 

 Eyes separated from each other at the base of the antennae by a 

 distance nearly half as great again as the length of the scape ; the 

 first joint of the flagellum longer than the second, which is equal 

 to the third. Posterior ocelli a little further from each other 

 than from the eyes and as far from the eyes as from the ]30sterior 

 margin of the head. Head and thorax subopaque, microscopically 

 punctured ; the pronotum less than half as broad as the head and 

 narrowed anteriorly, mesopleura? minutely punctured, the groove 

 rather shallow. Median segment smooth, rounded and steep 

 posteriorly, with a transverse row of coarse punctures at the base 

 and a short longitudinal sulcus at the extreme apex. Abdomen 

 shining, microscopically punctured, petiolate ; the first segment 

 very narrow, swollen at the apex, a little longer than the second 

 segment, the third and fourth segments the broadest. The re- 

 current nervui-e is received by the cubital cell at about three-fifths 

 from the base. 



Black ; the scajDe of the antennfe and the posterior anoles of the 

 pronotum yellow^ ; the first joint of the flagellum, the followino- 

 four joints beneath, the mandibles, tegulae, first joint of the 



