62 HYMENOPTERA FROM SARAWAK. 



Long- : 13-14 ; terebra 4 ram. 



Hab. Sarawak, Borneo ( Shelf ord). 



The sixth to seventeenth joints of the antennae are white. 

 Head black ; the face, clypeus, labrum, inner orbits to the end of 

 the eyes, the outer from shortly above their middle, almost the 

 basal two-thirds of the mandibles and the palpi, yellow ; the 

 front in the centre is strongly obliquely striolated ; the face is 

 rugosely punctured. Thorax black ; the projecting middle of the 

 pronotum, the tubercles, tegulae, the scutellums, a large raised 

 mark, narrowed on the inner side behind the hind wings, and a 

 small curved mark behind the mesopleural suture, pale yellow. 

 Pro- and mesonotum smooth and shining ; the pro- and mesopleura? 

 closely longitudinally striated, the stria? becoming weaker 

 somewhat towards the apex. The part of the median segment 

 immediately behind the transverse keel is coarsely aciculated ; 

 the rest is closely and distinctly transversely striated ; shortly 

 behind the transverse keel a broad yellow band originates, 

 which becomes broadly dilated on the apical slope, where it 

 extends to the middle, its sides being dilated, and the centre 

 rounded. Legs fulvous ; the four front coxa? and trochanters 

 are pale yellow ; the fore femora are lined with black above ; 

 the hinder coxae are black, yellow above and at the apex below ; 

 the trochanters, apex of femora and of tibia? black: the tarsi 

 white. Abdomen black above ; all the segments with their 

 apices yellow, the apical one very narrowly. 



Lactolus, gen. nov. 



Median segment elongate, w T ith one transverse keel ; its 

 base smooth, the rest closely transversely striated ; its apex has 

 a gradually rounded slope ; the keel on the lower part of the 

 metapleuree is complete and is roundly and broadly dilated at 

 the base. Front and vertex depressed, stoutly striated. Areo- 

 let of moderate size, longer than broad ; the transverse cubital 

 nervures have an oblique slope from the top to the bottom ; the 

 apical one is faint : the transverse basal nervure is almost 

 interstitial. 



There is only one transverse keel on the median segment ; 

 its spiracles are of an elongate oval slope ; the clypeus is not separ- 

 ated from the face ; the thorax is more than three times longer than 



