Fossorial IJymenoptera from tlie Khasia Hills. 59 



Crabro assamensis, sp. n. 



Niger, nitidus, linea pronoti, scutello, i)ostscutello basi apioeque 

 abdomiuis flavis ; coxis posticis subtus dentatis ; alls hya- 

 linis. S • 



Long. 8 mm. 



Aiitennie black, the scape lemon-yellow beneath ; the base 

 o£ the flagellum (the basal four joints) covered on the under- 

 side with long soft white hair. Front and vertex shining, 

 smooth^ plumbeous black ; the frontal furrow indistinct; 

 ocelli * . • ; tlie face and clypeus thickly covered with silvery 

 pubescence ; the apex of the clypeus projecting in the middle 

 and transverse. Mandibles yellow^ black at the base and 

 apex. Thorax smooth and shining, above with a plumbeous 

 line; a broad line on the edge of the pronotum, slightly and 

 roundly narrowed in the middle behind; the scutellum and 

 postscutellum and the tubercles yellow. The " enclosed 

 space" on the median segment is smooth and shining, and 

 has a shallow furrow down the middle ; the apical slope is 

 aciculated irregularly on the upper edges ; the middle furrow 

 is deep ; the middle and the sides on the apical part (almost 

 the half) are distinctly keeled ; pleurie smooth and shining ; 

 the mesopleural furrow almost entirely and the lower half 

 of the metapleural are crcnulated. Sternum thickly covered 

 with white hair. Legs black ; the apex of the trochanters, 

 the lower part of the four anterior femora, the outer side of 

 the four anteinor tibise, and a line on the outer side of the 

 posterior, yellow ; the middle tarsal joints are more or less 

 rufous, as are also the calcaria ; on the inner side of the 

 hinder coxse at the base is a broad tooth, narrowed and 

 rounded at the apex j the intermediate tarsi have the middle 

 joints spined. The petiole above has the sides and apex 

 lemon-yellow ; the black at the apex is dilated in the middle ; 

 below the apex is broadly yellow ; the apex of the penulti- 

 mate and the whole of the last segments are yellow ; on the 

 apex of the penultimate ventral segment are, in the middle, 

 two broad projecting spines, which are narrowed towards the 

 top ; the base of the hy[jopygium is broadly raised at the 

 base. 



The female may have an irregular mark on the sides of 

 the second and third abdominal segments^ that on the third 

 being the larger and more irregular; there may be a minute 

 mark on the sides of the fourth ; the large mark on the 

 scutellum may be more or less incised at the apex; the 

 pygidium is for the greater part yellow, and there may be 



