46 FAUNA HAWAIIENSIS 



transverse above ; second strongly convex longitudinally, but not raised, its sides 

 strongly rounded ; beneath, widely flattened beyond the costae, hardly depressed, not 

 raised up from their apices even at its sides, the costae themselves well developed. 

 Wings subhyaline, the front pair infuscate along the anterior margin, but without any 

 blue iridescence. 



Hab. Oahu, both mountain ranges. Not common. 



(31) Odynerus rudolphi. 



Odynerus cardinalis, Blackburn, P. Manch. Soc. xxv. p. 158 (nee Morawitz). 

 Odynerus imdolphi, Dalla Torre, Wien. Ent. Zeitg. viii. (1889), p. 124. 



Niger, nitidus, alis purpureo-iridescentibus. Clypeus vix emarginatus. Meso- 

 notum sparsim subtiliter sed distincte punctatum. Propodeum laevissimum. Abdo- 

 minis segmentum secundum ventrale baud supra costarum apices ad latera elevatum, 

 costis fortibus, depressione nulla, cf ? • Long. 7 — 9 mm. (Plate I. fig. 24 and 24 a.) 



Deep black and shining, generally with a minute yellow spot behind the antennae 

 and another behind each eye near the vertex. Wings infuscate with extremely bright 

 iridescence. 



Clypeus hardly emarginate at the apex ; head above the antennae distinctly but 

 not so very closely punctured. Mesothora.x finely remotely and distinctly punctured, 

 the surface very highly polished, and the minute system of punctures extremely 

 feeble and almost obsolete. Propodeum very smooth, shining, and with at the most 

 a few very fine punctures. Abdomen with the basal segment, seen from the side, 

 evenly curved from the petiole to the hind margin ; second segment strongly convex 

 longitudinally ; beneath flat, with no distinct depression, the costae strong, and the 

 segment at the sides not rising up from their apices. 



Hab. Mountains and coast of Oahu. Not rare. 



(32) Odyneriis brevicostatus, sp. nov. 



(/ niger, mandibulis rufis, alis nitide fuscis, margine antico tantum purpureo- 

 iridescente. Clypeus vix emarginatus. Mesonotum subnitidum, inaequaliter sub- 

 tiliter punctatum. Propodeum nitidum fere impunctatum. Abdominis segmentum 

 secundum fortiter convexum (baud elevatum) ; subtus, depressione definita nulla, 

 costis brevissimis, parte sua basali permagna et tumida. c/. Long. 6| mm. 



(/ black, with the mandibles red, wings infuscate with a purple iridescence. 

 Clypeus truncate at the apex. Mesothorax shining, irregularly, sparsely, and finely 



