FOSSORIAL WASPS. 597 



21. Abdomen wholly ferruginous 22. 



Abdomen wholly or partially black 24. 



22. Of small size, less thau 7 mm. in length 23. 



Of larger size, 11 mm. in length F. pelletieri Le Guillou. 



23. Posterior ocelli neaily twice as far from each other 



as from the eyes ; head not very large, pubesceuce 



of front white and sparse P. liitescens Turn. 



Posterior ocelli nearly as far from the eyes as from 

 each other; head massive, pubescence of front pale 

 golden and close P. dimidiatus Sm. 



24. Median segment very distinctly obliquely striated ... 25. 

 Median segment punctured, sometimes striolate- 



punctured at the base 28. 



25. Abdomen black, with more or less distinct bands of 



silver pubescence 26. 



Abdomen black, with bands of golden or fulvous 



pubescence 27. 



26. Mandibles and apex of clypeus black ; mandibles not 



unusually broad; posterior ocelli separated from 

 the eyes by a distance less than half as great as 



their own diameter P. westwoodi ^hwck. 



Mandibles and apex of clypeus ferruginous ; man- 

 dibles short and very broad ; posterior ocelli sepa- 

 rated from the eyes by a distance equal to their 

 own diameter P. mandihnlatum Turn. 



27. Tibiae and tarsi ferruginous, tegulaj testaceous ; 



transverse median nervure received beyond the 



basal nei'vure P. simillinms Sm. 



Tibias, tarsi, and tegulag black; transverse median 



nervure interstitial with the basal nervure P. dives Turn. 



28. Black, with white pubescence ; the tegulse sometimes 



brown, also sometimes the apex of the ventral 



segments 29. 



Partly ferruginous or brown ; or if black then with 



golden pubescence on the abdominal fasciae 36. 



29. Second ventral segment evenly, closely, and finely 



punctured 30. 



Second ventral segment much more sparsely and 



coarsely punctured in the middle than at the sides. 33. 



30. Median segment shining, the punctures microsc6pic ; 



length 6 to 7 mm P. inftimatum Turn. 



Median segment opaque or subopaque, very dis- 

 tinctly punctured or punctured-rugulose ; length 

 from 9 to 15 mm 31. 



31. Second joint of the flagellum a little less than half 



as long again as the third ; length from 12 to 



15 mm 32. 



Second joint of the flagellum scarcely exceeding the 



length of the third; length from 9 to 12 mm P. strennum Turn. 



32. Posterior ocelli as far from the eyes as from each 



other, separated from the eyes by a distance ex- 

 ceeding their own diameter F. perplexiis ^vi\., ^. 



Posterior ocelli nearer to the eyes than to each other, 

 separated from the eyes by a distance less than 

 their own diameter F.fuscipetinis Sm., ^. 



33. Second joint of the flagellum distinctly longer than 



the third ; abdominal segments not constricted ; 

 puncturation of the dorsal segments very minute 



or almost obsolete 34. 



Second and third joints of the flagellum subequal ; 

 abdominal segments rather strongly constricted ; 

 puncturation of the dorsal segments not very 

 minute F. ptmctidattmi Kohl. 



34. Puncturation of the mesonotum obsolete; posterior 



ocelli as near to the eyes as to each other, sepa- 

 rated from the eyes by a distance not exceeding 

 their own diameter P. spinolce Shuck. 



