54 P. CAMERON. 



being almost in a line with the lower, and of almost equal length to it : in idrieus the 

 lower is longer than the upper, which is on a different angle with it, it being only slightly 

 oblique. 



The lower part of the head, inside and out, is thickly covered with silvery pubescence ; 

 the clypeus is stoutly keeled. The scape of the antennae, the mandibles, except at the 

 apex, an interrupted line on the pronotum, the sides of the scutellum, the scutellar keels, 

 the tubercles, a mark on the upper side of the mesopleurae, between the two furrows, a 

 longish line on the sides of the third segment at the base, an oval mark on its sides at 

 the apex, and a shorter line on the sides of the fourth segment at the base, yellow. The 

 furrow bordering the scutellum is crenulated ; the post-scutellum is closely, longitudinally 

 striated. The area on the metanotum is furrowed down the middle and is finely and 

 closely, obliquely striated. The propleurae bear curved, not very stout striae. The narrowed 

 basal part of the petiole is shining and obscurely striated ; the nodose (and larger) apical 

 part is opaque. The stigma and alar nervures are fuscous ; the apical abscissa of the radius 

 has a sharp, straight, oblique slope. The four anterior femora are for the greater part, 

 the hinder are entirely, black ; the four front tibiae are yellow, lined with black behind ; 

 the posterior yellow, black at the base behind, the tarsi are yellow. 



5. Trypoxylon erythrozonatum, sp. nov. 



Nigrum, abdominis medio rufo ; tarsis anterioribus albis ; alis hyalinis ; nervis stigmateque 

 nigris. % . 



Long: 1-5 — 16 mm. 



Hab. Hulule, Male Atoll, Maldives. 



Scape of antennae bi'ownish beneath. Face, clypeus, and the lower part of the eye 

 incision densely covered with silvery pubescence. Mandibles for the greater part ferruginous. 

 The upper part of the front bears a narrow longitudinal keel ; the lower is raised, the 

 raised part becoming gradually wider towards the apex. Thorax thickly covered with rather 

 longish white hair ; the furrow below the tubercles is smooth ; there is a shallow central 

 furrow on the basal region of the median segment, which becomes gradually wider and deeper 

 towards the apex ; the apical furrow is wide : the sides have an oblique slope. Legs black ; 

 the basal two joints of the four anterior tarsi and the calcaria are white ; there is a 

 narrow pale band near the base of the hinder tibiae. The wings are slightly infuscated 

 at the apex. The apex of the petiole and the second and third segments are rufous. 



6. Trypoxylon melanurum, sp. nov. 



Nigrum, tarsis, tegulisque fuscis, alis hyalinis, stigmate fusco. (/. 



Long: 10 mm. 



Hab. Mamaduwari, Mahlos Atoll, Maldives; Minikoi, Laccadives. 



Antennae black, fuscous towards the apex ; the last joint is as long as the preceding 

 three united ; on the underside it is dilated at the base, narrowed towards the apex ; the 

 middle joints are slightly dilated beneath. Front and vertex closely punctured; on them 

 is a large area ; its upper part is rounded and encloses the lower ocellus ; its lower is 



