CAMERON—HYMENOPTERA. 73 
Localities. Chagos, Salomon Islands (I. Boddam and Sel), Egmont Islands, Peros 
Banhos. Common. 
Head and thorax strongly, closely punctured, the mesopleurs more or less reticulated, 
the propleurze with stout strie below the middle; the lower two-thirds of the 
metanotum closely striated, the strize roundly curved, the upper part sparsely punctured. 
Clypeus pyriform, broadly rounded above, the apex projecting, with a shallow incision, 
the sides slightly projecting. Inside the outer ocelli is a large, rounded, curved keel or 
projection, completely covering them on the inner and, to a less extent, on the 
outer side; in front, immediately behind the anterior ocellus, are two stout teeth, the 
part between is smooth and depressed. On the hinder part of the vertex in the middle 
is a depression, bordered behind by an irregular keel. Sides of metanotum rounded, 
without teeth or angles. Hirst abdominal segment cup-shaped ; the second slightly longer 
than wide and with the apical margin reflexed. 
The male has the clypeus, labrum, and mandibles yellow; there is an irregular mark 
or marks on the sides of the metanotum; the lines on the apices of the abdominal 
_ Segments are wider, there is a broad one on the fifth and two large roundish spots on the 
second ventral; the legs are for the greater part yellow. Underside of antennal scape 
yellow ; the apical joints are brownish: the hook testaccous, paler towards the apex; it 
is stout and does not quite reach to the base of the penultimate joint. 
The size and shape of the frontal keels and teeth appear to vary, There may bea 
small spot behind the eyes. 
11. Odynerus chagosensis, sp. nov. 
Black, the clypeus, except at the apex, a small triangular spot at base of mandibles, 
a spot, as wide as long, rounded below and slightly incised in the middle above, over the 
antenne, a small spot near the eyes behind, a line on the apex of the pronotum, a small 
irregular spot on the sides of scutellum, postscutellum, two oblique lines on the base of 
mesonotum in the centre, an irregular, slightly oblique mark, straight, oblique above, 
rounded below, on the pleurze under the tegulee, a broad line on the sides ef the meta- 
notum on the upper two-thirds, a broad band on the apex of the 1st abdominal segment, 
laterally broadly dilated backwards aud more narrowly and obliquely towards the centre 
of the segment, broad bands on the 2nd, 3rd, and 4th segments and a narrow one in the 
middle of the 5th, yellow. Legs black, a broad yellow line on the apices of the four anterior 
femora below. Wings fuscous violaceous, paler at the base, ?. 
Length 13 mm. 
Localities. Chagos, Salomon Islands, 2; Peros Banhos, ¢. 
Clypeus breadly pyriform, not much longer than wide, broadly rounded above, the 
apex only very slightly incised, depressed. Head, pro- and mesothorax closely, strongly 
punctured. On the inner side of the hinder ocelli is a longish rounded keel; the space 
between smooth ; behind the anterior are two stout, blunt teeth ; the parts at the sides and 
in front of the ocelli smooth and shining; the centre of the vertex at the end has a 
small depression in which are two stout keels united behind and curved. Base of thorax 
SECOND SERIES.—ZOOLOGY, VOL. XII. al 
