HVMENOPTERA FHOM SARAWAK. 99 



Long : 18-19 mm. 



Hab. Pankalan Ampat, Sarawak. 



Antennae stout, black, the apex rufous. Head black; the 

 outer part of the antennal keel pale yellow ; it is longish, stout 

 and has a narrower keel on its apex ; the face, cheeks and 

 clypeus are thickly covered with silvery pubescence; except 

 behind the ocelli it is closely and somewhat strongly punctured. 

 Mandibles black ; the basal half broadly yellow ; behind the 

 middle above they project upwards into a large, smooth shining, 

 bluntly pointed tooth. Thorax densely covered with silvery 

 pubescence ; above closely and distinctly punctured, the punc- 

 tures in the middle of the mesonotum running into longitudinal 

 striations. The scutellum is slightly depressed in the middle ; 

 the area on the median segment is longitudinally striated. Legs 

 black, covered with a silvery pile ; the four hinder tibiae are 

 broadly lined with pale yellow behind. The wings are dark 

 smoky, the base and the discoidal cellule paler; the hinder 

 wings are almost hyaline except at the apex. Abdomen red, 

 the apical two segments for the greater part black above ; it is 

 smooth, with the petiole and the penultimate segment sparsely 

 punctured. The pygidium is closely punctured, reticulated ; the 

 sides of it are fringed with stout stiff hairs ; the oblique sides of the 

 segment are sparsely punctured ; the apical half of the epipygium 

 is incised in the middle ; the incision is distinctly bordered, is 

 rounded and obliquely narrowed behind ; the segment at the 

 base is depressed on either side. 



In colouration this species is not unlike C. viligans Sm. and 

 C. sepulcralis Sm., but may be easily separated from them by 

 the stout projecting tooth on the mesopleuree. The head is 

 large and is well developed behind the eyes ; the apex of the 

 clypeus is depressed and is bluntly and shortly tuberculated in 

 the middle and at the sides, the basal half of the petiole is keeled 

 in the middle ; the second cubital cellule on the lower side is 

 distinctly shorter than the third. 



Cerceris latidens, sp. nov. 



Black ; the inner lower orbits, the base of the mandibles, the 

 sides of the scutellum, the post-scutellum, the apex of the 

 petiole and an interrupted line on the apex of the thiid segment, 



