Hymenoptera. 85 



small yellow dot in the middle, a triangular yellow spot above, and 

 another, sub -rotund, on the mesopleura. Scutellum with a broad 

 longitudinal yellow strijDe on each side ; post-scutellum yellow, 

 metathorax with a broad curved yellow stripe on each side. 

 Abdomen with the first segment yellow above, except in front, 

 a black line, interrupted behind, on the median line above ; second 

 segment yellow above, except at the base, and on a wide conical 

 space which extends to three-quarters of its length ; on the hinder 

 edge of the segment the yellow colour is continued on the lower 

 surface, but does not form a complete ring, being widely inter- 

 rupted in the middle ; the third segment bordered behind on the 

 upper surface. Wings dirty hyaline, smoky along the costa, and 

 in the radial cell. 



"Allied to 0. confluentus, Smith, from Sumatra, but differing 

 much in colour from any described species." 



Thirteen specimens, from Flying Fish Cove, August, 1897; west 

 coast, October, 1897; north part of island, December, 1897, and 

 January, 1898; central part of island, February, 1898. 



7. Polistes balder. 



Folittes balder, Kirb. : P.Z.S., 1888, p. 552. 



"Exp. al. 28mm.; long. corp. 13mm. 



" Ochreous - yellow, with linear black markings. Head with 

 a black line just above the antennge, the ends of which run 

 upwards on each side, and slightly diverge ; below the antennte 

 the clypeal suture is black, and this curve is sometimes connected 

 with the upper one by a black line on each side within the 

 antennae; a black line crosses the head just behind the ocelli, over 

 which extends a continuous black spot; the tips of the mandibles 

 are also black, as well as the basal parts of the head and prothorax. 

 Thorax with all the sutures more or less black, sometimes not 

 continuously ; the central black line is frequently incomplete 

 behind. Pectus and pleura black, the latter marked with four 

 or five large and small yellow spots. Scutellum, post-scutellum, 

 and metathorax yellow ; the sutures rather broadly black ; groove 

 of the metathorax black. Legs almost entu-ely yellow, or reddish 

 yellow ; the trochanters and the extreme tips of the coxoe and 

 base of the femora black. Abdomen inclining to reddish yellow, 

 but with no distinct markings, except a black spot above at the 

 base of the first segment, and the suture between the first and 

 second segment, which is generally black. Wings smoky hyaline, 

 with brown nervures ; costal nervure and costal region yellowish. 



" Allied to P. heir (BUS, Fabr., but smaller and differently 

 coloured. The first segment of the abdomen, too, appears to be 

 a little longer and more gradually widened. 



