HYMENOPTERA 55 



from the base ; on its ventral surface it rises strongly and abruptly from the apices 

 of the costae, its depression short and narrow and rather deep in front. 



Hab. Molokai mountains (3000 — 4000 ft.). \ ^ \ %. lao Valley, Maui, i %. 



(48) Odyneriis microdetnas, sp. nov. 



Niger, alis infuscatis, caeruleo-iridescentibus, fronte, pronoto, mesopleuris, post- 

 scutello, lateribusque propodei rubro-notatis. Abdominis segmentum primum ex majore 

 parte rubrum ; secundum ad latera nonnunquam rubro-maculatum. 



Caput supra antennas nitidum, dense punctatum. Mesonotum laeve, grosse 

 fortiterque punctatum. Abdominis segmentum secundum minus elevatum, subtus 

 depressione angustula. </$. Long. 5 — 7 mm. 



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

 prothorax, the mesopleurae, postscutellum and sides of the propodeum have red 

 markings. The basal segment of the abdomen is red over the greater part of its 

 surface, and the second is sometimes spotted at the sides. 



Head above the antennae closely coarsely and shallowly punctured, the apex of 

 the clypeus hardly emarginate. Mesothorax coarsely punctured, the surface smooth 

 between these punctures and almost (or quite) without the minute interstitial punctu- 

 ration. Abdomen with the second segment not much raised from the base, shining 

 and shallowly punctured ; seen from beneath, its ventral surface is somewhat strongly 

 raised from the costae at the sides, and even in the middle the depressed portion, 

 where it meets these, rises up convexly from their apices ; the depression itself not 

 very wide. 



Hab. Molokai mountains (3000 ft.). 



(49) Odyneriis monobius, sp. nov. 



Niger, alis infuscatis, caeruleo-iridescentibus, fronte, pronoto, mesopleurisque 

 rubro-maculatis ; abdominis segmento primo postice interrupte rubro-marginato. Clypeus 

 levissime dentato-emarginatus. Caput supra antennas laeve, distincte punctatum. 

 Mesonotum subfortiter et irregulariter, propodeum in concavitate sua dense punctatum. 

 Abdominis segmentum primum dense et grosse punctatum ; secundum evidenter 

 elevatum ; subtus, ad latera minus fortiter sed abrupte supra costarum apices eleva- 

 tum, depressione costis oblique occurrente. </. Long. 6 mm. 



Male black, wings infuscate, with blue iridescence. A median spot behind the 

 antennae, the prothorax in front, a spot on the mesopleurae, and the apical margin 

 of the basal abdominal segment narrowly, red. Head above the antennae smooth, 



