FOSSORIAL WASPS. 603 



18. PiSON FESTIVUS Sm. 



Pisonfestivus Sm. Trans. Ent. Soc. London, p. 296 (1869), 5 . 



The head is broad, the posterior oceUi are a little further from 

 the eyes than from each other, the clypeus very broadly rounded 

 at the apex. The median segment is obliquely striated, with 

 punctures intermixed, the median carina is distinct, but not 

 placed in a sulcus ; the first dorsal segment is strongly depressed 

 at the apex. Male unknown. 



JIab. Swan River, W.A. (Du jBoulai/). 



19. PiSON FENESTRATUS Sm. 



Piso7i nitidus Sm. Trans. Ent. Soc. London, p. 248 (1868), $ 

 (nee Smith, 1858), 



Fison fenestratus Sm. Trails. Ent. Soc. London, p. 291 (1869). 



This species is allied to festivus, but is rather less robust, the 

 colour of the abdominal fasciae is difierent, and the median seg- 

 ment is closely and strongly punctured, not striate. The male 

 has the third and fourth joints of the flagellum strongly dilated 

 beneath. 



Hab. Champion Bay, W.A. (Du Boulay) ; 'Yallingup, W.A. 

 {Turner), January ; Hermannsburg, Central Australia {Hillier). 



20. PiSON DIMIDIATUS Sm. 



Pison dimidiatus Sm. Trans. Ent. Soc. London, p. 295 

 (1869), S. 



The head is massive, the posterior ocelli being nearly as far 

 from the eyes as from each other ; the clypeus is produced into 

 an acute point ; the second abscissa of the radius is a little longer 

 than the petiole of the second cubital cell ; the transverse median 

 nervure is interstitial with the basal, and the sulcus of the median 

 segment is quite distinct, with the usual carina. Female un- 

 known. 



Hah. Champion Bay, W.A. {Du Boulay). 



21. * Pison PELLETiERi Le Guillou. 



Pison pelletieri Le Guillou, Ann. Soc. Entom. France, p. 320 

 (1841), $ . 



" Capite nigro, facie aureo-pubescente ; antennis et mandibulis 

 f ulvis ; mesothorace nigro ; metathorace punctato-scabro, albo 

 pubescente ; abdomine et pedibus f ulvis ; alls translucidis. 

 $ . Long. 11 mm. Hab. Australie septentrionale. 



Tete noire ; yeux echancres en dedans, toute la face est couverte 

 d'un duvet dore. Antennesa mandibules fauves. Corselet noir. 

 Metathorax pointille en maniere de chagrin, convert d'un leger 

 duvet blanchatre; abdomen et pattes entierement fauves. Ailes 

 claires." 



42* 



