6o4 FAUNA HAWAIIENSIS 



34. Wings darker and facial markings generally much smaller N. assimulans, var. oahuensis. 



Wings clearer and facial markings larger N. assimulaiis. 



35. Yellow colour of the face continued far behind the antennae as a broad vitta 



along the eye-margins 36. 



Yellow colour if continued behind the antennae forming a narrowing vitta, 



pointed at its termination N. volatilis. 



36. Scape of antenna pale above anteriorly, mandibles with a yellow line N. hostilis. 



Scape entirely pale above, mandibles without a yellow line N. hilaris. 



37. Abdomen ferruginous N. paradoxica. 



Abdomen not ferruginous 38. 



38. Scape excessively dilated, the front margin very strongly rounded (prothorax 



never with a yellow line or spots) i(). 



Scape not excessively dilated, its front margin at most only gently rounded, 

 prothorax sometimes with a pale line or spots 40. 



39. Scape of antennae strongly transverse, front margin extremely strongly rounded N. insignis. 

 Scape less wide and its front margin less strongly rounded N. saiel/es. 



40. Face dotted with rather short erect black hairs, for the most part evenly, 



between the antennae and apex of clypeus ; two large facial spots below 



the antennae and sometimes the clypeus also with pale marking N. setosifrons. 



Face not so clothed 41. 



41. Prothoracic pale band very broad, hind tibiae almost entirely creamy white, 



wings very dark with steely iridescence, face black (? always) N. perspicua. 



Without some or any of these characters 42. 



42. Wings above (when expanded) fuscous, without conspicuous blue or violet 



iridescence 43. 



Wings with conspicuous blue or violet iridescence 45. 



43. Face below the antennae with pale markings N. anomala. 



Face without pale markings 44. 



44. Pronotum with an entire or almost entire pale band N. fuscipetinis. 



Pronotum rarely with an entire band sometimes all black N. puhesceiis. 



45. Apical abdominal segments with dark hairs, second ventral segment less raised 



from the base, pronotum always with an entire or almost entire band AL caeruleipennis. 



Apical segments pale-haired, second ventral segment more raised, pronotum 



black, or with pale spots or a broken band, rarely with an entire one N. puhesceiis var. 



( I ) Nesoprosopis ombrias, sp. nov. 



Male black, the legs more pitchy, the tarsi paler, the front tibiae yellow in front 

 the flagellum of the antennae dull reddish beneath, clypeus black, a yellow spot on the 

 face on either side of it, probably sometimes absent. Cheek very short, the base of the 

 mandibles nearly touching the eye, the plate above the clypeus not very wide, its apical 

 side about as long as its lateral one to the antennal fossa, the front of the head densely 

 and shallowly punctured. Scape of antennae subdilated, its upper side strongly rounded, 

 about twice as long as its greatest width, seen from in front slightly arched beneath. 

 Mesonotum excessively dull with dense minute surface sculpture, finely and very shallowly 

 punctured, the scutellum more closely. Propodeum with its anterior area entirely 

 rugose. Wings smoky brown, with some blue iridescence. Abdomen less dull than 



