mixed. Front densely punctured. Mesonotum with sparse irregular 

 larger (but not coarse) punctures and distinct, very minute, but not dense, 

 interstitial ones; propodeum with more or less evident puncturation, the 

 punctures being coarse, feebly impressed and mostly obsolete. Basal 

 abdominal segment with shallow and not close puncturation, second 

 strongly convexly raised from the base in the male, less so in the female, 

 but still strongly convex in profile; beneath, with the costae well devel- 

 oped, the depression wide, quite deep and distinct. Length, 9-11 mm. 

 Hab. Waianae, Oahu; near the coast. 



Odynerus lithophilus. 



Black, the two basal abdominal segments with a pale yellow apical 

 band ; the female usually in addition has yellow markings on the tegulae 

 and post-scutellum, a small medio-f rental and post-ocular spot; the male 

 may have all or some of the following yellow marks ; the clypeus, a spot 

 on the mandibles, a line on the antennae, a median frontal spot and one 

 behind each eye, all the tibiae to a large extent, coxal and femoral spots, 

 the base of some of the tarsi, spots on the pronotum, tegulae, scutellum 

 and post-scutellum. 



Front of head closely punctured ; mesonotum with moderately strong 

 and close puncttiration, but variable in this respect, the surface dull or 

 subopaque. Basal abdominal segment with coarse shallow punctures, 

 second beneath with distinct and well-developed costae, and without a 

 definite depression behind these. Length 7-11 mm. 



Hab. Coasts and lowlands of Oahu, widely distributed and 

 locally common. 



Odynerus epipseustes. 



Very like the common O. nigripcnnis Holmgr. but of larger average 

 size, with the iridescence of the wings brighter, and the general colour of 

 a deeper, more shining black. It is readily distinguished by the perfectly 

 developed costae of the second abdominal segment beneath, which in 

 nigripennis are obsolete or obsolescent and the impression behind the 

 costae is very feebly indicated, the surface being polished. Length 

 12.5-16 mm. 



Hab. Mountains of Oahu; much rarer — one in tens of 

 thousands — than the ubiquitous 0. nigripennis. 



Odynerus tempe sp. nov. 



Black, somewhat shining, the clypeus, front, pronotum, mesopleura, 

 apical margin of the first abdominal segment, and sometimes the scutellum 

 and propodeum marked with red. 



Head in front closely punctured ; the mesonotum with distinct punctures , 

 more irregular posteriorly, the interstices shining and with the minute 

 puncturation distinct; scutellum finely but distinctly punctured; propo- 

 deum somewhat smooth and with conspicuous punctures. Basal segment 



