HYMENOPTERA 39 



with a coarse rugose puncturation. Basal segment of the abdomen very coarsely 

 punctured towards the brow, less so near the apical margin ; second segment simple 

 above, not raised from the base, but with only the ordinary longitudinal convexity ; 

 beneath with the costae long, followed by no distinct depression, but usually somewhat 

 flattened triangularly in its place. 



Hab. Mountains of Kauai. Not common. 



(19) Ody Iter Its peles, sp. nov. 



Niger, peropacus. Rlandibulae fere totae nigrae. Clypeus levissime emarginatus 

 vel truncatus. Capitis et mesonoti puncturatio fere obsoleta. Propodeum rugosum 

 vel rugoso-punctatum. Abdominis segmentum secundum baud elevatum, tantum longi- 

 tudinaliter convexum ; subtus, depressione distincta, minus alta. d"?. Long. 6 — 9 mm. 



Male black, the abdomen never with yellow bands. Mandibles dark, the extreme 

 apex sometimes reddish or piceous. Apex of clypeus slightly emarginate or truncate. 



Head and thorax very dull, with shallow subobsolete puncturation, sometimes almost 

 invisible. Mesothorax not clothed with a silky pile, but with a very short erect 

 pubescence, easily seen in lateral view. Propodeum rugose, generally more or less 

 reticulately so, the rugosities being apparently the interstices between large shallow 

 punctures, hardly now to be recognized as such. Abdomen dull, the basal segment 

 with very shallow punctures ; the second simply convex above, not raised from the base, 

 beneath with the depression somewhat wide at its base but not deep. 



Female very like the d", with obscure puncturation, the interstices between the 

 punctures of the mesothorax very dull, and the minute punctures thereon not very 

 distinct and somewhat scattered and remote from each other. 



Hab. Kona and Kau districts (2000 — 4000 ft.) of Hawaii. Not a rare species. 



Obs. This species greatly resembles the following, but the d" is abundantly 

 distinct by the form of the clypeus and the different form of the mesothoracic 

 pubescence. The ? may be known by the very slightly emarginate or truncate apex 

 of the clypeus and the different sculpture of the surface of the mesothorax, which in the 

 following has the minute system of punctures very dense and distinct. 



(20) Odynems sociabilis, sp. nov. 



Niger, d" sericeo-pubescens. Margo segmenti primi et secundi (vel unius ex his) 

 apicalis saepe anguste flavus. Mandibulae ex majore parte rufae. Clypeus fortiter 

 dentato-emarginatus. Mesonotum puncturatione obsoleta vel fere obsoleta. Propodeum 

 puncturatione subobsoleta rugosum. Abdominis segmentum secundum subtus depres- 



