sciisque
variis flavis ornata.

_Female._ Length 6-1/2 lines. Black; the abdomen with tints of blue
violet; the thorax slightly prismatic; the labrum, clypeus, an angular
scape above, an abbreviated line on the inner orbits of the eyes, the
scape in front, and the antennae beneath, yellow; the cheeks with a
silvery reflexion. The thorax beneath, and the metathorax, with a
shining white silvery pile; the anterior and intermediate femora and
tibiae beneath yellow; the tarsi pale ferruginous, and more or less
fuscous above; wings subhyaline, the nervures fuscous; a spot on the
lateral posterior angles of the metathorax, two ovate spots on the
scutellum, and a line on the postscutellum yellow. Abdomen: the basal
segment with a broadly interrupted fascia a little before its 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, _Fabr._

1. Bembex melancholieca, _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 frequently
much obliterated in the females; others are as highly coloured as any
examples I have seen.

Gen. PISON, _Spin._

1. PISON NITIDUS. _P._ nitidus, niger, distincte punctatus; alis
subhyalinis, 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 behind, 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