FOSSORIAL WASPS. 5'95 



11. Apical dorsal seomeiits smooth P. monfawis C»m. 



Apical dorsal segments closely and distinctly punc- 

 tured 12. 



12. Posterior ocelli as far, or further, from the eyes as 



from each other P- (lUonywum Schulz. 



Posterior ocelli nearer to tlie eyes than to each other. P. rhodesiamtm Bisch. 



Key to the Species of Pison inhahitmg British India. 



1. Two cubital cells (Pv.sojjoirfes) 2. 



Three cubital cells (Pmow) ^• 



2. First abdominal seo:nient petiolate, longand naiTow, 



the apical breadth not more than one-third of that 



of the second segment ;■ ■■■ P. ohliferafvf! Sm, 



First segment not petiolate or elongate, the apical 

 breadth more than half of that of the second 

 segment •^- -rr \,^ 



3. Legs, except the coxa?, entirely light ferruginous ... P. eri/iJiropvs Kohl. 

 Legs either wholly piceons or with the tibi* only 



ferruginous *• 



4. Legs wholly piceous P.acfilishm. 



TibiiE almost entirely dull ferruginous 5. 



5. Posterior slope of median segment finely striated on 



the apical half P. rothneyiQam. 



Posterior slope of median segment finely punctured . P. differens Turn, 

 fi. Second recurrent nervure received before two-thirds 



from the base of the second cubital cell 7- 



Second recurrent nervnre received .I'ust before the 

 apex of the second cubital cell, or interstitial with 

 the second transverse cubital nervnre 8. 



7. Front minutely punctured ; a well-defined transverse 



impressed line behind the posterior ocelli P- argentatvs Shuck. 



Front coarsely punctured ; no distinct impressed line 



behind the posterior ocelli P. r«,gos«s 8m. * 



8. Pubescence of abdominal fascia^ golden ; median seg- 



ment coarsely longitudinally striated, the strise 



not curved P- TcoMHBmgV.. 



Pubescence of abdominal segments whitish, if pre- 

 sent; strife of median segment curved or absent ... 9. 



9. Median segment strongly obliquely striated, without 



punctiu-es '. P. prmcfjfrow.s Shuck. 



Median segment punctured, with or without a few 



curved strife ■ l^* , 



10. Median segment with a few curved strise ; wings 



hyaline P- orientate Cam. 



Median segment without strife; wings infusrate, 



the apical margin broadly darker P.fasciatus Kad. 



Key to the Australian Species o/Pison. 



1. Two cubital cells (Fisoivoides) 2, 



Three cubital cells (Pison) 12. 



2. First abdominal segment elongate, strongly narrowed 



to the base '";• 



First abdominal segment not elongate . ., rr 



3. Second cubital cell pointed on the radius P- ^cartoides iurn. 



Second abscissa of the radius at least half as long as „ , rr 



the first transverse cubital nervnre P. difficile iurn. 



4. Abdomen almost entirely ferruginous 5. 



Abdomen hlaclr, the apical margins of the segments 



sometimes dull brown with golden pubescence ... 6. 



5. Median segment slender, longer than the breadth in 



the middle ; eyes as far apart on the vertex as on 



thedypeus yv ^- i'"'*'"^''^' ^""^• 



Median segment not slender, shorter than the breadth 



in the middle : eyes further apart on the clypeus , -r, , 



than on the vertex P. er,/t7irnffastn.mTio\nY, 



