1910.] FOSSORIAL WASPS OF AUSTRALIA. 343 



tarsus. Tarsal ungues bidentate at the base, the pulvillus large, 

 Second cubital cell very short on the radial nervure, not more 

 than one-third of the length of the third, which is longer on the 

 radial than on the cubital nervure ; the second cubital cell is 

 nearly twice as long as the third on the cubital nervure and 

 receives the first recurrent nervure just before the middle, the 

 second just before the apex. 



Entirely black ; wings pale flavo-hyaline, clearer towards the 

 apex, nervures testaceous. 



Length 24-25 mm., expanse of wings 32 mm. 



5 unknown. 



Hab. Hermannsburg, Central Australia (H. J. Hillier). 



Described from two specimens in the British Museum. 



SCELIPHRON L^TUM Sm. St. CYGNORUM St. n. 



9 . Very near typical Icetum, but differs in the following 

 details : the depression in the middle of the pronotum is much 

 deeper, the second cubital cell is longer on the radial nervure, 

 and the yellow markings are absent from the scutellum, post- 

 scutellum, apex of the median segment, and fourth abdominal 

 segment ; the base of the intermediate femora is marked with 

 black and the yellow on the pronotum and fifth abdominal 

 segment is more or less reduced. 



Hab. South- Western Australia. 



An intermediate form occurs in the north-west, in which the 

 second cubital cell is of the same shape as in the typical form and 

 the intermediate femora and postscutellum are coloured as in the 

 type, the scutellum is also marked with yellow. The typical 

 form occurs at Hermannsburg, Central Australia, and on the 

 north and east coasts. 



Key to the Australian Species q/*Sphex. 



9 ?• 



A. Second cubital cell higher than broad Subgenus Harpactopus. 



a. Wings flavo-hyaline, the apical third pale 



fusco-hyaline S. seevus Sm. 



b. Wings hyaline, clouded at the apex 8. globosus Sm. 



B. Second cubital cell as broad as high or broader. 



a. Third abscissa of the radius half as long as 

 the second transverse cubital nervure or 

 nearly ; the median segment without a 



stigmal sulcus Subgenus Isodontia. 



a 2 . Legs ferruginous S. abditus Kohl, st. nugenti. 



b 2 . Legs black. 

 a 3 . Petiole much shorter than the basal 

 joint of the hind tarsi ; wings pale 



ftavo-tvyaline S. claviger Sm. 



6 3 . Petiole nearly as long as the basal joint 

 of the hind tarsi or longer ; wings 

 hyaline or fuscous. 

 a 4 . Wings fuscous or fusco-hyaline, 



glossed with purple S. albohirtus Turn. 



b 4 . Wings hyaline, clouded at the apex. 

 a b . Petiole longer than the basal joint 



of the hind tarsi S. nigellus Sm . 



ft 5 . Petiole scarcely as long as the basal 



joint of the hind tarsi S. obscurellus Sm. 



