620 MR. R. E. TURNER ON 



Tachyhalas nic/e?' Latr. Gen. Crust, et Ins. iv. p. 75 (1809), 5 . 



I'ison atrum Kohl, Verh. zool.-bot. Ges. Wien, xxxiv. p. 184, J • 



This is the best-known European species, though far from 

 common. It may be distinguished from the other South Euro- 

 pean species P. sericeum by the sculpture of the median segment, 

 which is punctured in ater, finely olDliqnely striated in sericeum, 

 and by the much greater distance between the posterior ocelli 

 and eyes of sei'iceum, equal in the male of that species to 

 twice the diameter of an ocellus, in the male of aier only equal 

 to the diameter of an ocellus. In se^nceum also the margins 

 of the abdominal segments are dark brown, in ater black. The 

 size of ater is also considerably less than that of sericeum. 



Hah. Genoa (Spinola) ; S. France (Latreille) ; Albania (Saun- 

 ders) ; Switzerland (Kohl) ; Gibraltar ( Walker). 



I- 63. PlSON SERICEUM Kohl. 



Fison sericeum Kohl, Yerh. zool.-bot. Ges. Wien, xxxviii. 

 p. 140 (1888), d . 



Hah. Attica {Kohl) ; Italy {ex coll. F. Smith). 



\/ *64. PisoN ASSXMiLE Sickm. 



Pison assimile Sickm. ZooL. Jahrb.. viii, p. 212 (1895), $ . 

 Very similar to P. ater, but more finely punctured. 

 Hah. Tientsin. 



65. Pison fasciatus Had. 



Pseudonysson fasciatiis Had. Horee Soc. Ent. Ross. xii. p. 105 

 (1876), cJ; Rad. Bull. Soc. Nat. Moscou, p. 592 (1891), 



The description is poor, but apparently the species is allied to 

 algiricum, but with normal antennae. To this species I assign 

 an Indian specimen with soine doubt. 



Hah. S.E. Caucasus ; Chapra, Bengal {Mackenzie). 



1/ *66. Pison suspicax Kokuj. 



Pison suspicax Kokuj, Mitt.. Kaukas^ Mus. vii. p. 6 (1912), S . 

 This may be distinguished from all other Paltearctic species by 

 the golden pubescence of the head and abdomiual fasciae. 

 Hah. Caucasus. 



67. Pison algiricum Kohl. 



Pison algiricum Kohl, Terraes Fuz, xxi. p.. 353 (1898), $ S • 



In the male sex this is distinguished by the thickening of the 

 third to sixth joints of the fiagellum beneath, near the apex. A 

 somewhat similar structure, much more strongly developed, but 

 confined to the third and fovirth joints, is seen in the Australian 

 P. fenestrat'us Sm. Kohl compares tbe present species with 

 fasciatus Rad., in which the antenrue are normal. 



Hah. Oran {Schmiedeknecht) ; Marakesh {Escalera), April. 



