HYMENOPTERA OF THE HAWAIIAN ISLANDS. 213 



22. Odynerus hawaiiensis. 



O. hawaiiensis , sp. nov. Minus robustus^ subopacus^ sub- 

 tiliter pubescens, niger; mandibulis rufis; alis vio- 

 laceis ; clypeo vix emarginato ; capite abdomineque 

 obscure, thorace vix evidenter punctatis; abdominis 

 segmento primo vix transverso, antice subverticali, 

 secundo tuberculato-elevato. 



Long. S 12 millim., ? 13-13! millim. 



Rather an obscure-looking species. The head is some- 

 what closely punctured^ but the punctures are faintly 

 impressed ; the rest of the trunk appears impunctate, but 

 opaque; when examined with a lens, however, it is seen 

 to have a double system of punctuation, but it is all so 

 faintly impressed as to be hardly noticeable. The meta- 

 thorax is delicately alutaceous rather than punctured. 

 The basal segment of the hind body is about as long as its 

 greatest width, somewhat (but not abruptly) vertical in 

 front, and thickly covered with large shallow punctures; 

 the next two segments have fine punctures in front and 

 large ones behind; the remainder (except the last) are 

 coarsely but not deeply punctured. The apical joint in 

 the antennae of the male is testaceous. Allied to 0. vul- 

 canus. This species is easily distinguishable by its man- 

 dibles, more or less red, and by the shape of the first 

 segment of the hind body, which is especially noticeable if 

 looked at from the side, when it is seen to be longer (from 

 the apex of the petiole) than high, whereas the proportion 

 is reversed in O. vulcanus. 



I have taken this insect several times on the mountains 

 of Hawaii. It is somewhat variable ; I have several spe- 

 cimens that I attribute to it, in which the punctuation is 

 even more faintly impressed than in the type, and one in 

 which the metathorax is slightly rugose. I have also a 



