HYMENOPTERA OF THE HAWAIIAN ISLANDS. 197 



Xylocopa have been introduced in timber from America. 

 Metdcoelus and Spalangia are parasites on the house-fly. 

 Neither of them is^ I believe, common in Europe; nor am 

 I aware if they inhabit America. A species of Spalangia 

 has been found in the Galapagos Archipelago. 



The genera Prosopis, Megachile, Odynerus, Leptogenys, 

 Pimpla^ Ophion, Limneria, Chelonus, Epitranus, Chalets, 

 Eu'pelmus, and Evania have a wide range over the earth. 

 The genus Echthromorpha is, so far as we know, confined 

 to oceanic islands, the five known species being from 

 the Hawaiian Islands, St. Helena, Ascension, and Tahiti, 

 Society Isles, in which latter island a new species has 

 recently been discovered by Mr. J, J. Walker, R.N. The 

 genera Sierola, Moranila, and Solindenia are only known 

 from the Archipelago, but our knowledge of the Chalci- 

 didse is not sufficient to enable me to say anything very 

 definite about the affinities of the island species. Sierola 

 and Scleroderma belong to a group of much interest, 

 being one which is intermediate between the Terebrant 

 and Aculeate sections of Hymenoptera. A species of 

 Scleroderma, it may be noted, is found in St. Helena. 



Smith offers the opinion that the Hymenoptera are most 

 nearly related to the American fauna. On this point I 

 am not prepared to offer an opinion at present; and I 

 rather think that Smith formed his conclusion on the 

 occurrence of Xylocopa ceneipennis, Polistes aurifer, &c., 

 which have been introduced, as I believe, by man^s 

 agency, and consequently must not be taken into account 

 in judging of the affinities of the endemic species. 



The following is the literature relating to the Hyme- 

 noptera of the Archipelago : — 



Fabricius, Ent. Syst. ii. p. 269 {Odynerus radula). 



F. Smith, Cat. of Hymen. Idb. i. p. 23 {Proso2ns flavipes and P. anthra- 

 cinu). . • 



