( 131 ) 



VII. Notes on Hawaiian Wasps, with Dcscri2'>tions of New 

 Species. By Egbert Cyril Layton Perkins, 

 B.A. Communicated by Dr. David Sharp, M.A., 

 F.R.S. 



[Read March 5th, 1902.] 



The present paper deals only with the wasps which are 

 found on the island of Hawaii, and the distinguishing 

 characters of the many species are given in the table, 

 which will enable the hymenopterist to readily separate 

 the various forms. Only four or five of these species are 

 found on any other island of the group, all the rest being 

 peculiar to Hawaii. These species are more numerous and 

 difficult than the Oahuan species, which I have previously 

 tabulated (E. M. M., Vol. XII., 2nd Ser., p. 264), and 

 consequently I have added sufficiently full descriptions of 

 the new ones. Owing to the one sex (whether $ or $) 

 frequently presenting striking characters not exhibited by 

 the other, the table from 27 becomes double, the males 

 being treated of from 27 to 59, the females from 60 to 92. 

 Before 27 males and females are included under each 

 head. In one or two cases I have included a species both 

 under the ^ and $, although the latter sex is not known 

 to me, but in these cases the characters given are such as 

 present no differences according to the sex. A little care is 

 necessary in examining the emargination of the apex of the 

 clypeus, as the depression behind it often makes it appear 

 stronger than is really the case, and it should be noticed 

 that strong cyanide is liable to turn the yellow markings 

 red, especially the small frontal spot, the colour of which 

 I have found it convenieiit to use in one case. I tliink it 

 probable that the table includes nearly all the species that 

 exist on Hawaii, and that very few more remain to be 

 discovered. 



TABLE OF SPECIES. 



1. (2) Postscutellum with an elevated ridge ; second discoidal cell 

 at the apex about twice as liigh as the third discoidal at 



its base O. mgnpemiis, Holingr. 



TRANS. ENT. SOC. LOND. 1902. — PART li. (.JUNE) 10 



