1901.] HYMENOPTEBA OP THE " SKEAT EXPEDITION." 41 



the front legs, the middle femora at the base, and the greater part 

 of the middle tibiae are testaceous ; the basal joint of the middle 

 tarsi and the basal third of the posterior and the hinder tro- 

 chanters, the femora, tibiae, and calcaria are black. Abdomen 

 black, except the apical segment, which is white. 



Skeatia nigeispina, sp. n. 



Nigra, coxis, trochanteribus et feonofibus anterioribus, basi 

 femormn posticorum late tarsisque posticis flavis ; alis hyalinis, 

 nervis stigmateqwe nigris. $ . 



Long. 13, terebra 3 mm. 



Hab. Bukit Besar, Malay Peninsula. 



Antennae as long as the body, thickened towards the apex ; 

 the 6th to 13th joints white, except above. Front and vertex 

 shining; the front below the ocelli stoutly, irreg'ularly longitudinally 

 striated; the lower part excavated, smooth except for a stout 

 keel down the middle. Face coarsely aciculated, slightly and 

 broadly projecting in the centre, where it is yellow ; clypeus 

 broadly, roundly convex ; its lower part projecting and slightly 

 oblique. Mandibles dark testaceous ; their lower border keeled. 

 Mesonotum aciculated ; the scutellum is more shining, the post- 

 scutellum still more so. The basal region of the median segment 

 has two keels in the centre, which converge towards the apex ; 

 the parts nearest to them are smooth and shining ; the rest 

 opaque, with some thin oblique striae on the inner portion. The 

 middle part of the propleurae is stoutly striated. Mesopleurae 

 closely striated, except above. Except at the base above, the 

 metapleurse are closely, stoutly, obliquely striated. The meso- 

 pleural keel is curved, deep, not very wide, and striated. Meso- 

 sternum smooth and shining. The median segment behind the 

 transverse keel is closely reticulated ; the apical slope is irregu- 

 larly transversely striated ; the teeth are stout, cuiwed, black, dull 

 testaceous towards the apex. Legs black ; the four anterior coxae, 

 trochanters, and femora, the hinder coxae, basal two-thirds of the 

 femora, and the hinder tarsi except the extreme base, yellow. 

 Abdomen black : the apical two segments lemon-yellow above ; 

 the 2nd and 3rd segments are shagreened, the others smooth and 

 shining. 



Vagenatha, gen. nov. 



Edges of pronotum and median segment stoutly spined. Para- 

 psidal furrows distinct ; the first joint of the flagellum distinctly 

 longer than the second. Median segment with one incomplete 

 transverse keel. Middle segments of the abdomen distinctly 

 separated and narrowed at the base ; the edges of the second, 

 third, and fourth on the lower edges at the apex projecting into 

 spines. Petiole broadly dilated at the apex, the postpetiole 

 clearly defined ; the spiracles are nearer to each other than to the 

 apex ; on the loAver side at the base are two sharp, oblique teeth. 



