FOSSORIAL, WASPS. 599 



49. Posterior ocelli separated from the eyes by a distance 



fully equal to their own diameter; second ventral 



segment black, broadly ferruginous at the apex ... P. aureosericeum Rohw. 

 Posterior ocelli separated from the eyes by a distance 

 distinctly less than their own diameter ; second 

 ventral segment wholly ferruginous P. auratus Shuck. 



50. First dorsal segment with a black spot on each side 



near the middle ; transverse median nervure 



received before the basal nervure P. exornatum Turn. 



First dorsal segment not spotted with black ; trans- 

 verse median nervure received beyond the basal 

 nervure P- exultans Turn. 



1. PiSON (PiSONOIDES) ICARIOIDES Turn. 



Pison {Aulacophilus) icarioides Turn. Proc. Zool. Soc. London, 

 p. 521 (1908), $, 



The species is better placed in Pisonoides than in Aulacophilus, 

 being without the long petiole and striated mesopleurfe charac- 

 teristic of the latter. The first abdominal segment is, however, 

 n\uch more elongate than in other species of Pisonoides, except 

 difficile, from which it is easily distinguished by the short and 

 stout antennfe, and the different shape of the second cubital cell. 



Hah. Cairns, Q. {Dodd) ; Mackay, Q. (Turner), January ; 

 Brisbane, Q. [Hacker), January. 



2. PisoN (Pisonoides) BiFFiciLE Turn. 



Pison (Aidacophilus) diddle Turn. Proc. Zool. Soc. London, 

 p. 520(1908), $. 



Hab. Caii-ns, Q. {Tardier), January ; Mackay,. Q. {Turner). 



This species and the last superficially resemble Icaria socia- 

 listica Sauss. and other closely related species of Icaria, which 

 occur in the same district.. 



3. Pison (Pisonoides) pertinax Turn. 



Pison (Parapison) pet'tinax Turn. Proc. Zool. Soc. London, 

 p. 517 (1908), $ . 



The abdomen is usually wholly ferruginaus, but the third and 

 fourth dorsal segments are sometimes more or less infuscated. 



Hab. Cairns, Q. (Tm-ner), July ; M^ickn.y^ Q..{Tarner), November 

 to May ; Brisbane, Q, (Hacker), May. 



4. Pison (Parapison) erythrogastrum Rohw. 



Pison (Parapison) ei-ythrogasty-iun Rohw. Proc, U.S. Nat- Mus. 

 xlix. p. 247 (1915), §. 



This is very wq^ly pertinax, h\xt may be distinguished by the 

 greater distance between the eyes on the clypeus, by the longer 

 pronotuin, and by the shorter and broader median segment. 

 The sculpture of the median segment is also more distinct. 



Hab. Duaringa, Q. Pi'obably- from the Barnard collection. 

 Kalamunda, W.A. (Turner), February and March.. 



