HYMENOPTERA 83 



(8) A^esoprosopis volcanica, sp. nov. 



N. difficili simillima, d" antennarum articulo primo subtus levius arcuato, 

 lamina supraclypeari angustiore, genis longioribus, segment! 8' apice longe bifurcato ; 

 ? genis longioribus, scutello magis opaco distinguenda. ^ % . Long. 6 — 8 mm. 

 (Plate II. figs. 12 — 12(5.) 



This species has the form and general appearance of A^. difficilis, and the facial 

 markings of the </ are similar to those of that species, and similarly variable. The 

 legs are nearly always entirely dark, without yellow markings. 



Male, with the scape of the antennae rounded on its posterior margin, about twice 

 as long as wide, as in most of the foregoing species, but very distinctly less strongly 

 arched beneath ; cheeks between the mandible and eye longer, and the plate above the 

 clypeus narrower in proportion to its height, than in A^. difficilis. Mesothorax and 

 scutellum dull from the surface rugulosity, clothed with long grey hairs, as also is the 

 front of the head behind the antennae ; wings clear in fresh examples. Process of 

 the 8th ventral segment with long delicate bifurcations at its apex. 



Female, very like the </" apart from sexual differences, the head and thorax being 

 similarly clothed, the cheeks unusually long, the scutellum quite dull, the wings hyaline 

 or subhyaline. 



Hab. Hawaii, near the active crater Kilauea, where it is abundant. I have 

 also taken it in the Kona district at a similar elevation {4000 ft.), and at the bottom 

 of the crater of Haleakala, Maui (7000 ft.). 



(9) Nesoprosopis nivalis, sp. no\'. 



Nigra, opaca, genis longissimis, capite et mesonoto pubescentia longa vestitis ; 

 c/ capite, ut praecedentis, flavo-decorato, utrinque juxta oculos fortiter depresso ; 

 antennarum articulo primo fortiter dilatato, lateribus rotundatis, longiore quam latiore; 

 ? scutello opaco, aequaliter distincteque punctato. c/?. Long. 6 — 8 mm. (Plate II. 

 figs. 13 and 13a.) 



Male, with the face very long and narrow between the eyes, the cheeks between 

 the mandibles and eyes extremely long ; the clypeus, the plate above it and a spot 

 on each side of it, yellow ; these markings are variable, the spots varying in size, 

 and those outside the clypeus may be entirely wanting ; antennae with the scape 

 much more strongly dilated than in the preceding species, having both its anterior 

 and posterior margins rounded, but its length is evidently greater than its width. 

 The face is very deeply depressed at the sides, then strongly raised round the 



II — 2 



