160 SMITH ON HYMENOPTEBA OF ABU ISLANDS. 



apical margin ; the second and fourth segments with a narrow yellow 

 fascia at their apical margins, which is widened laterally; beneath, 

 the second and third segments with a yellow spot on each side. 



The Male differs from the female in having a large quadrate black spot 

 on the clypeus, and a spot at the base of the labrum ; there is also a 

 narrow yellow line on the posterior margin of the prothorax ; and the 

 third segment of the abdomen has a yellow fascia : it is also rather 

 smaller. 



Hab. Aru. 

 This insect very closely resembles Larra prismatica, from Borneo, 



Malacca, and Celebes, of which it may be a variety. 



Gen. Bembex, Fahr. 



1. Bembex melanehoHea, Smith, Cat. Hym. pt. iv. p. 328 ; Proc. Linn. 



Soc, ii. p. 105. 

 Hab. Aru ; Sumatra ; Borneo. 



Many of the specimens from Aru are less highly coloured than those 

 of Sumatra or Borneo : the yellow markings on the abdomen are fre- 

 quently much obliterated in the females ; others are as highly coloured 

 as any examples I have seen. ♦ 



G-en. PisoN, Spin. 



1. PisoN NiTiDus. p. nitidus, niger, distincte pmictatus; alis sub- 

 hyalinis, venis fuscis ; segmentis abdominalibus apice depressis. 



Female. Length 5 lines. Black and shining ; the head and thorax 

 strongly punctured ; the face beneath the antennae, the clypeus, 

 cheeks, and the sides of the segments of the abdomen covered with a 

 silvery down; the palpi pale testaceous; the mandibles obscurely 

 ferruginous at their apex. The metathorax transversely striated be- 

 hind, with a central longitudinal impressed line above, which is 

 transversely striated, and terminates in a deep fovea just beyond the 

 verge of the posterior inclined truncation ; the wings subhyaline ; the 

 nervures dark fuscous; the first recurrent nervure received at the 

 apex of the first submarginal cell, and the second at the base of the 

 third submarginal. Abdomen shining, and more delicately punc- 

 tured than the thorax ; the margins of the segments deeply depressed. 



Hab. Aru, Key Island. 



Gen. GoETTES, Latr. 



I. GoRYTES CONSTRICTUS. G. niger ; clypei lateribus flavis ; coUari, 

 tuberculis postscutelloque flavis ; segmentorum abdominis marginibus 

 apicalibus flavis constrictis, pedibusque flavo variegatis. 



Female. Length 6 lines. Black ; the head and thorax very closely punc- 

 tured and opake, the head slightly shining on the vertex ; the antennae 

 beneath and the apical half of the mandibles ferruginous, the latter 

 black at their tips ; the clypeus yellow at the sides, and coarsely 

 rugose in front. Thorax : the metathorax coarsely longitudinally 



