HYMENOPTERA 27 



(2) Nesocrabro bidecoratiis, sp. no v. 



Niger, mandibulis, antennarum articulo basali, thorace, et tibiis flavo-notatis^ 

 abdomine fasciis flavis ornato ; segmento quinto cupreo, dense punctate, pubescentia 

 aureo-rufa vestito, sexto pilis ejusdem colons fimbriate. ?. Long. 10 mm. 



Female black, with the basal half of the mandibles, a line on the scape of the 

 antennae, an interrupted band on the prothorax, a transverse spot on the scutellum 

 and postscutellum, a spot at the base of all the tibiae beneath, and a band on each 

 of the first four segments of the abdomen, yellow. Fifth segment of a somewhat 

 metallic copper colour, densely punctured, and clothed with dark golden-red pubescence, 

 the elongate sixth segment fringed with similar hairs, its surface somewhat smooth, 

 and strongly, but not densely, punctured. Head in front with shallow dense punctures, 

 the vertex with dark pubescence. Mesothorax clothed with black pubescence, the 

 surface dull, the puncturation shallow, and by no means coarse. Propodeum with 

 grey pubescence, and with short longitudinal rugosity at the extreme front ; behind 

 this dull, the surface roughened. Abdomen with the second segment densely and 

 finely punctured ; beneath, about the middle, it is impunctate ; towards the sides 

 distinctly punctured, very densely and minutely on the lateral pubescent spots. This 

 segment and the basal have a pale yellow spot on their ventral surface. Posterior 

 tibiae with pale reddish spines, the calcaria bright fulvo-testaceous. Wings sub- 

 hyaline, somewhat clouded towards the base. 



Hab. a single ? taken at Kilauea, Hawaii, in September 1895. I'"" spite of 

 its extremely distinct appearance I suspect it may prove to be a variety of the following- 

 species. 



(3) Nesocrabro rubrocaudatiis. 



Crabro rubrocaudatus, Blackburn and Cameron, P. Manch. Soc. Vol. xxv. 

 p. 172 (1885-86). 



Niger, abdomine nigro, segmentis apicalibus rufo-pubescentibus ; c/ thorace opaco, 

 haud flavo-notato, alis infuscatis, caeruleo-iridescentibus, % thorace (antice saltern) 

 opaco, alis subhyalinis minus fortiter infuscatis. 1% . Long. 7-5 — 10 mm. (Plate L 

 fig. 1 1 and I i«.) 



Male black, the wings deeply infuscate and with bright blue iridescence ; the 

 5th, 6th, and 7th abdominal segments densely clothed with red pubescence. Female 

 with the 5th segment so clothed and the sixth with a fringe of the same colour, 

 the prothorax and postscutellum sometimes spotted with yellow, wings much less dark 

 than those of the (/, subhyaline or lightly in.fuscate, sometimes with more or less 

 blue iridescence. 



Antennae of the ^ with the 6th joint but little produced at the apex ; front 

 of the head dull and subobsoletely punctured, clothed with dark hairs and in some 



4—2 



