ON FOSSORIAL WASPS. 



591 



29. Kotes onJ the Wasps of tlie Genus Pison, and some 

 allied Genera. By Rowla^jd E. Turner, F.Z.S., 



F.E.S. 



[Received June 5, 1916 : Read October 24, 1916." 

 Index. 



Page 

 System- A TIC ^ 



Pison ashmeadi, nom. 'nov. for 

 P. punatulntvs Ashm. (nee 



punctulatum 'K6[\\) 625 



P. dives, sp. n. Australia... 608 



P. congener, sp^ "n. „ ... 607 



P. exornatum, sp. n, „ ... 614 



P. exuHans, sp. n. „ ... 615 



P. inconspiculim, %p.x\. „ ... 612 



P. f rater cuius, sp. n. „ ... 610 



P. liitescens, sp. n. „ ... 604 



P. mandihniatum, sp. ti. „ ... 605 



P. meridionale, sp. n. „ ... 611 



Fisnn pulchrinum , sp. n. Australia 



P. strennum, sp. n. „ 



P. ivoUastnni, sp. n. St. Hel-eua . 



P. inaquaJe, sp. n. E. Africa 



P. (Pisonoides) iestaceipes, sp. n. 

 Nigeria 



P. (P.) dijferens, sp. n. Assam... 



Aulacophihis jan'soni, sp. n. Ni- 

 caragua. 



Pison JcBtus Sm. to Scapheutes ... 



P . jlaoipichis Sm. to Scapheuies -. 



P. pilosus Sm. to Pisonopsis 



Page 



61.3 

 606 

 624 

 623 



618 

 617 



592 

 629 

 629 

 629 



KeT/ to the Genera most nearly allied to Pison. 



1. Mandibles excised on the outer margin Pisonopsis Fox. 



Mandibles not excised 2. 



2. Abdomen with a long petiole; mesopleurse cx)arsely longi- 



tudinally striated AuIacopJiihis Sm. 



Abdomen without a long petiole ; mesopleurse not striated... Pison Jur. 



The petiole in Aulacophihis is formed by tlie fii^t stern ite, 

 distinguishing the genus clearly from those species of Pison in 

 which the abdomen is subpetiolate through the narrowing of the 

 first tergite to the ba?;e. 



Genus AuLAcotiiiLuS Sm, 

 Key to the Species o/ Auiacophilus. 



1. First recurretit uervure received distinctlj' befoi'e the 



apex of the first cu"bital ; the slender petiole of the 

 fir.st segment, as far as the apex of the dorsal s\ilcus, 



longer than the hind trochanter and femur combined. A. eumenoides Diicke, 

 First recurrent norvure interstitial M'ith the first trans- 

 verse cubital nervnre; the slender ijetiole of the first 

 segment as far as the apex of the dorsal snk-as slrorter 

 than the hind trochanter and femur combined 2. 



2. Petiole to the end of the sulcus no longer than the Tiind 



fettiur^, posterior ocelli distinctly further from the 

 eyes tlian from each other ; three basal joints of 



antennpe ferruginous ...._ ^. vespoides Sm. 



Petiole to the end of the sulcus longer than the hind 

 femur ; posterior ocelli equidistant from the eyes and 

 from each other ; antennae wholly black _ A.jansoniT-dvTi. 



1. AULACOPHILUS EUMENOIDES Dlicke.. 



Aulacophihis eumenoides Diicke, Zeitschr. Hym. Dipt. iv. p. 97 

 (1904),$. 



This is at once distinguished ffom the two other species by 

 the longer and more slender petiole, the slender portion of which 



