HYMENOPTERA. 313 



Dinetus pictus, Steph. Illustr. vii. Supp. 12. t. 42. f. 3. 



Wesm. Hym. Foss. Belg. 73. 1. 

 Hob. Britain; France; Italy; Germany; Belgium; Austria. 



Genus 10. PISON. 



Alyson, pt., Spin. Ins. Lig. ii. 253 (1806-8). 

 Pison, pt., Spin. Ins. Lig. ii. 256. 

 Tachybulus, Latr. Gen. Crust, et Ins. iv. 75 (1809). 

 Neptiridia, Brulle, Trans. Ent. Soc. Fr. ii. 75 (1833). 



1. PlSOX ATER. 



Alyson ater, Spin. Ins. Lig. ii. fasc. 4. 253. t. 3. f. 12 <J . 

 Pison Jurinii, Spin. Ins. Lig. ii. 256. 



St. Farg. et Serv. Ency. MeU. x. 143. 1. 



Van d. Lind, Obs. ii. 39. 1. 



St. Farg. Hym. iii. 230. 1. 



Tachybulus niger, Latr. Gen. Crust, et Ins. iv. 75. 

 Pison ater, Shuck. Trans. Ent. Soc. ii. 75. 1. 



Hab. Italy; France. 



2. PISON PUNCTIFROXS. B.M. 

 Pison punctifrons, Shuck. Trans. Ent. Soc. ii. 77- 5 ? . 



Hab. India or St. Helena. 



3. PISON RUGOSUS. 



Female. Length 4 lines. Black : clothed with silvery pubes- 

 cence, especially the face, cheeks, legs, and apical margins of the 

 segments of the abdomen ; the sides of the thorax and meta- 

 thorax, and also the base of the abdomen, with long glittering 

 silvery-white pubescence ; the head, mesothorax and scutellum 

 coarsely punctured ; the base of the metathorax coarsely obliquely 

 striated, with a central deep longitudinal channel which is trans- 

 versely striated as well as the truncated portion; the sides of 

 the thorax and the pectus strongly punctured ; the wings hyaline, 

 the nervures testaceous; the first recurrent nervure received 

 towards the apex of the first submarginal cell, and the second 

 recurrent nervure received about the middle of the second sub- 

 marginal cell. Abdomen shining, the basal segment with strong 

 scattered punctures, the following segments much more finely 

 punctured, and most densely so towards the apex. 



Hab. India. (Coll. W. W. Saunders, Esq.) 



This species belongs to Shuckard's subgenus (Pisonitus}. 



