HYMENOPTERA FROM JAPAN AND THE PACIFIC. 263 



^ XXVI. 



ON SOME HYMENOPTERA (CHIEFLY UNDESCRIBED} 

 FROM JAPAN AND THE PACIFIC. 



BY P. CAMERON. 



[Read 29th December, 1SS5.] 



The five following species were collected by Mr. 

 J. J. Walker, R.N., during his last voyage in the 

 Pacific : 



POLISTES 3IACAENSIS. 



A specimen taken by Mr. Walker at Tahiti, Society 

 Islands, is probably a form of the variable and widely- 

 distributed P. tnacaensis. The specimen is yellqw, 

 variegated with red; and with the vertex in the 

 centre, the occiput, three broad lines on the 

 mesonotum, a broad line (interrupted in the middle) 

 on the pronotum, the pleural sutures broadly, the 

 apex of the scutellum in the middle and a narrow 

 line down the centre, the base and apex of the 

 metanotum, a broad line down its middle and 

 another on each side, an oblique line on the 

 metapleura, the base of the petiole broadly, a trans- 

 verse line near the middle, the basal three-fourths- 

 of the second segment and the other segments with a 

 narrow curved line near the base, black. The legs 

 are yellow, variegated with red; the coxae are 

 broadly marked with black behind and laterally; 

 the trochanters and femora and the hind tibiae are 

 lined with black above. The antennae are yellow, 

 except the upper side of the scape, which is black. 



I am inclined to refer this example to P. tnacaensis^ 

 on account of the characteristic waved black lines- 

 on the abdomen. Another form, which I identify 

 as P. tnacaensis, I have from the Sandwich Islands^ 



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