HYMENOPTERA 603 



21. Face extremely wide; the supra-clypeal plate extremely wide and short 22. 



Face not wide and transverse ; supra-clypeal plate with the apical margin 



about equal in length to its side as far as the antennal fossa N. kona. 



22. Clypeus for the most part or entirely yellow ; wings nearly clear ^V. kauaiensis. 



Clypeus with a yellow spot, wings dusky N. unica. 



23. Yellow markings of face continued up far behind the antennae along the eye- 



margins as a broad vitta N. inquilina. 



Yellow markings rarely continued back behind the antennae and then only for 

 a short distance or as a rapidly narrowing vitta 24. 



24. Face extremely wide and transverse across the eyes in front view ; clypeus 



black, but yellow spots on each side of the face between the clypeus and 



the eyes are sometimes present N. laticeps. 



Clypeus generally yellow-marked, if black the face is not transverse 25. 



;5. Scape of antennae very strongly dilated, subcordiform ; face below the an- 

 tennae entirely yellow or almost entirely N.flavifrons. 



Scape not so shaped, often elongate triangular, the anterior margin not 



strongly rounded 26. 



6. Clypeus with a large yellow spot or all yellow, sometimes there is a small spot 



outside the clypeus near to or touching its side margin on each side 27. 



Clypeus either with a small yellow spot or entirely black, or if with a large 

 yellow spot or nearly all yellow then there is a large yellow generally more 

 or less triangular-shaped spot between the clypeus and the eye-margin on 



each side, these spots always distinct from the yellow clypeal spot 28. 



Wings dusky, hind tibiae not yellow at the base, plate above the clypeus 



black N. koae. 



Wings clearer, hind tibiae yellow at the base, supra-clypeal plate more or less 



yellow N. vicina. 



\ Very small narrow species, with excessively short wrinkles at the anterior 



' margin of the propodeum, the rest of the dorsal surface of which is 



smooth, except for microscopic surface sculpture ; clypeus black, meso- 



thorax not clothed with dark hairs N. mauiensis. 



Species not very small and narrow ; propodeum generally rugose or rugulose 

 to the brow or nearly ; clypeus generally yellow-marked, if black, the 



mesonotum is clothed with long black hairs 29. 



Clypeus and sides of face either black or yellow-marked, variable, antennal 

 scape very deeply arched beneath ; mesonotum with long erect black 



hairs N. inelanothrix. 



\ntennal scape gently or moderately arched, mesonotum not clothed with long 



black hairs 30. 



ate above the clypeus always short and wide, wider than long to the point 



where its sides meet the antennal fossae 31. 



ite above the clypeus as long or longer than wide to the point where its 



sides meet the antennal fossae 3r. 



■peus only bearing a yellow spot N. comes. 



:e below the antennae with three yellow spots N. coniceps. 



peus black N. ombrias. 



peus yellow or marked with yellow 33. 



ad posteriorly strongly emarginate, so that the vertex is much shorter 



medially than at the sides N. sphecodoides. 



:ad lightly emarginate, the length of vertex in the middle and at the sides 

 not greatly different 34. 



I. 78 





