HYMENOPTERA 33 



punctured, scutellum impunctate or nearly so ; wings infuscate with blue iridescence. 

 Propodeum dull, impunctate, or with faint traces of almost obsolete punctures. Basal 

 segment of the abdomen dull, with shallow punctures, second raised from the base 

 but not very strongly, more so in the ^ than the ? ; beneath, with the depression 

 wide and deep ; the segment at the sides, raised up abruptly and rather strongly 

 from the apices of the costae, prominent on either side of the depression at its base. 



Hab. Kilauea, Hawaii (4000 ft.). 



(5) Odynerus melanognathus, sp. nov. 



Niger, minus robustus, alis caeruleo-iridescentibus. Clypeus cf fortiter, ? 

 evidenter dentato-emarginatus. Mesonotum opacum, sparsim subtiliter punctatum. 

 Propodeum puncturatione levissime impressa, fere obsoleta. Abdominis segmentum 

 secundum subtus depressione lata. ^%. Long. 9— 11 mm. 



In general appearance very like the preceding, but easily known by the following 

 characters. Mandibles dark, apex of clypeus of d" deeply, of ? distinctly, though 

 less strongly, dentately-emarginate. Mesothorax rather more distinctly punctured, the 

 propodeum in front with very shallow but evident punctures. Second abdominal 

 segment beneath rather less prominent on either side of the depression in front. 



Hab. Kona, Hawaii (1500 ft. and above). Rare, ic/' 2? taken. 



(6) Odynerus cyphotes, sp. nov. 



Niger, alis caeruleo-iridescentibus. Mesonotum opacum subtilissime sparsim 

 punctatum. Segmentum abdominis secundum fortiter subitoque tuberculato-elevatum, 

 subtus depressione minus lata. </?. Long. 8 — 10 mm. (Plate L fig. 16.) 



Mandibles dark, apex of clypeus hardly emarginate, head above the antennae dull, 

 evenly and very shallowly punctured. Mesothorax dull, with fine sparse punctures, 

 sometimes nearly obsolete, and an exceedingly minute and close puncturation between 

 these. Wings infuscate, with blue iridescence. Propodeum sometimes with a very 

 feeble indication of shallow punctures. Abdomen with the basal segment slightly 

 depressed along its apical margin, and shallowly punctured; second very strongly 

 and abruptly raised from the base into a tuberculate form above ; beneath, with 

 the depression rather narrow, the segment at the sides rising abruptly from the 

 costae to a height as great or rather greater than that of its basal portion. 



Hab. Kona and Kau districts of Hawaii (4000 ft.). 



p. F. H. 5 



