Mr. R. E. Turner on Fossorial Hymenoptera. 555 



Genus Tachysphex. 



Key to the Tasmanian Species. 



22- 



1 . Median se<jment smooth 2. 



Median segment rugose-reticulate T. rugidorsatus, Turn. 



2. Second joint of the flagellum longer than the 



third T. pacificus, Turn. 



Second joint of the flagellum equal to or 

 shorter than the third 3. 



3. Second joint of the flagellum equal to the 



tiiird ; pygidium sti'ongly compressed 



laterally .' T. pugnator, Turn. 



Second joint of the flagellum shorter than the 



third ; pygidium not compressed laterally. T. disa-epans, Turn. 



Tachysphex pacificus, Turn. 

 Tachysphex pacificus, Turn. Proc. Zool. Soc. London, p. 491 (1908). $ . 



Hah. Mt. Wellington, 2200 ft.; January. Eaglehawk 

 Neck ; February. 



Originally described from Victoria. 



The antennse are rather slender, the second joint of the 

 flagellum considerably longer than the third. 



Tachysphea; discrepans, sp. n. 



? . Black ; the mandibles at the apex fusco-ferruginous ; 

 tegulai testaceous brown ; spines of the anterior tarsi 

 testaceous. 



Clypeus obliquely depressed from below the middle to the 

 apex, shining and spaisely punctured. Head opaque, the 

 antennas rather stout, third joint of the flagellum longer than 

 the second by about one-quarter ; eyes separated on the 

 vertex by a distance equal to about twice the length of the 

 second joint of the flagellum; a distinct longitudinal frontal 

 sulcus reaching the anterior ocellus, a strong depression on 

 the vertex behind the posterior ocelli. Pronotum very much 

 depressed below the mesonotum, almost vertical ; thorax 

 shining and only microscopically punctured. Median seg- 

 ment opaque, smooth, very broadly rounded at the apex, with 

 a deep groove on the middle of the posteiior slope. Abdomen 

 shhiing, microscopically punctured, a band of white pubes- 

 cence on each side of the apical margin of segments 1-3 ; 

 apical segment not compressed laterally, elongate-triangular. 

 First and third abscissse of the radius about equal in length, 

 the second distinctly longer, recurrent nervures separated by 



