61 



Papers. 



The following paper was read by the Chairman: 



Notes on Hawaiian Wasps, With Descriptions of New Species. 

 By R. C. L. Perkins, 

 (abstract) 

 This paper dealt with the habits, economic importance, 

 parasites and especially with the colouration of the Hawaiian 

 Odynerus. It was shown that the many species formed a num- 

 ber of very distinct and definite colour groups and that all the 

 phenomena of the so-called "inedible associations" were pre- 

 sented by them. The causes supposed to give rise to these 

 "inedible associations" were, however, absent in the Hawaiian 

 Islands. Three synoptic tables were furnished, one dealing 

 with the species frequenting Oahu, being a revision of the table 

 published in the Entomologist's Monthly Magazine ("Notes on 

 Hawaiian Aculeate Hymenoptera," (2) XII, pp. 264-8, Nov., 

 1901); a second deals with the species of Maui, Molokai and 

 Lanai; and a third with those of Kauai. The species of Hawaii 

 were published in the "Transactions of the Entomological 

 Society of London" (1902, pp. 131-40; "Notes on Hawaiian 

 Wasps, with Descriptions of New Species"). Several new 

 species were described and some previously named in the dichoto- 

 mous table of Oahuan species, above mentioned, were now more 

 fully described. 



(i) SYNOPSIS OF OAHUAN ODYNERUS. 



1 (4) Dorsal and posterior faces of the post-scutellum sharply defined 



by a serrulate or spinulose ridge (easily seen from in front) ; 



2 (3) Costae of second ventral segment more or less obsolete. 



Odynerus nigripennis. 



3 (2) Costae of second ventral segment well developed. 



O. epipseustes. 



4 (1) Dorsal and posterior faces of the post-scutellum not divided by 



a serrulate or spinulose ridge. 



5 (10) Intermediate tibiae without a true calcar, at most with some 



very short spines at the apex. Nesodynerus. 



6 (7) Second ventral segment with a shallow but evident triangular 



impression behind the costae. N. optabilis. 



7 (6) Second ventral segment without such an impression. 



8 (9) Wings with brilliant purple or blue iridescence. A^". rudolphi. 



9 (8) Wings fuscous without such iridescence. N. oblitus. 



