TURNER— FOSSORIAL HYMENOPTERA 371 



Localities. Seychelles : Silhouette, numerous specimens settling and running on 

 paths on plateau of Mare aux Cochons, over 1000 ft., VIII. — IX. 1908 ; Mahe, from near 

 Morne Blanc, about 800 ft., XL 1908, and from Cascade Estate in March 1909 (H. Scott). 

 Astove, one specimen (R. P. Dupont). Described by Saussure from Madagascar. 



Genus Bembex Fabr. 



18. Bembex madecassa Sauss. 



Bembex madecassa Sauss., Mitth. Schweiz. entom. Ges. viii. p. 260, 1891. 



Localities. Aldabra, many specimens, found in all places where sand or guano is 

 present (1908 — 9, J. C. F. Fryer). Assumption (1909, R. P. Dupont). Cosmoledo 

 (H. P. Thomasset). Also Madagascar.. 



Genus Pison Jur. 



19. Pison specidare, sp. n. 



?. Nigra, nitida, capite opaco ; segmento mediano nitido, in medio longitudinaliter 

 sulcato ; alis hyalinis, leviter infumatis. 



Clypeus clothed with short, delicate, silver pubescence, the anterior margin slightly 

 incurved, produced in the middle into a distinct angle. Head opaque, the eyes rather 

 deeply emarginate, the distance between them at the base of the clypeus greater by one 

 half than that on the vertex ; the posterior ocelli very near to the eyes, twice as far from 

 each other. Antennae inserted as near to the eyes as to each other, the second joint of 

 the flagellum about twice as long as the first and equal in length to the third. Thorax 

 shining, microscopically punctured, the mesopleurse rather more strongly punctured ; 

 median segment shining, with a longitudinal median sulcus not quite reaching the apex, 

 the sulcus broad at the base and marked with a short longitudinal carina and a few faint 

 oblique striae, except in the sulcus the segment is smooth. Abdomen smooth and shining, 

 the three basal segments a little depressed at the apex, the first segment a little longer 

 than the breadth at the apex. Second cubital cell reaching the middle of the second 

 transverse cubital nervure, receiving the first recurrent nervure close to the base, the 

 second recurrent nervure received close to the base of the third cubital cell. 



Entirely black, the abdominal segments without bands of pubescence. Wings hyaline, 

 clouded with fuscous ; nervures black. 



Length 8 mm. 



Localities. Seychelles : Praslin (November) : Mahe, Morne Blanc, 1000 ft. (November 

 1908, H. Scott). 



The median segment resembles in the want of sculpture that of P. insulare Sm. from 

 the New Hebrides, but the shape of the clypeus is different. 



20. Pison argentatum Shuck. 



Pison argentatus Shuck., Trans. Ent. Soc. London ii. p. 79, 1837. 



Locality. Aldabra (J. C. F. Fryer). A wide-ranging species, originally described 

 from Mauritius. 



