32 FAUNA HAWAIIENSIS 



less than usual ; wings with violet iridescence. Propodeum with feeble subobsolete 

 punctures, sometimes hardly visible. Second segment of the abdomen strongly raised 

 from the base, the depression beneath not so deep as in the preceding species. ?. 



Hab. Oahu, Waianae Mts. and coast. Haleakala, Maui (5000 ft.) } A single ? 

 only taken in each case. I think it probable that the latter locality is erroneous. 



(3) Odynerus naiadum, sp. nov. 



Niger, alis infuscatis, caeruleo-iridescentibus, fronte, mesopleuris, postscutello 

 (maris etiam pronoto) rubro-notatis ; segmento primo abdominis postice rubro- 

 marginato. (/ clypeus fortiter, ? minus fortiter sed distincte dentato-emarginatus. 

 Mesonotum haud nitidum, subtilius subrugoso-punctatum. Abdominis segmentum 

 secundum elevatum ; subtus, depressione sat lata et alta. </ ?. Long, g — 10 mm. 



Black, the wings infuscate and with blue iridescence. The front of the head 

 behind the antennae, the mesopleurae, the postscutellum, and in the cf the prothorax 

 also, have red markings. The apical margin of the basal segment of the abdomen 

 has a red band, dilated at the sides. Clypeus deeply dentately-emarginate in the 

 t/, less deeply, but distinctly so in the ?. Head closely and rugosely punctured. 

 Mesothorax dull, with two systems of puncturation. The larger punctures are not 

 coarse and on the posterior half of the thorax somewhat irregular, the minute 

 interstitial punctures are unusually strong, especially in the ?, and both kinds have 

 a tendency to run into each other, giving the thorax a subrugose appearance. 

 Propodeum with subobsolete shallow puncturation, the posterior concavity subrugose. 

 Basal segment of the abdomen shallowly punctured ; second strongly raised from the 

 base in the </, somewhat less so in the ? ; beneath, with the depression distinct 

 and deep. 



Hab. Molokai mountains {3000ft.); local and scarce. lao Valley, Maui, i?. 



(4) Odynerus erythrognatlms, sp. nov. 



Niger, minus robustus, mandibulis rufis, alis caeruleo-iridescentibus. Clypeus 

 ad apicem depressus, vix emarginatus. Mesonotum opacum sparsim subtilissime 

 punctatum, puncturatione fere obsoleta. Abdominis segmentum secundum elevatum, 

 subtus depressione lata. </?. Long. 8 — 10 mm. 



Black, the mandibles red, the wings with blue iridescence. Apex of clypeus 

 (as in nearly all the Hawaiian species) depressed from the sides, giving it a dentate 

 appearance, very slightly emarginate, or truncate ; head above the antennae very dull, 

 with fine feebly impressed punctures. Mesothorax dull, very finely and obscurely 



