of Fossorial Hymenoptera. 299 



femora ; the thorax at the sides, and also beneath, yellow, with 

 a large quadrate black spot on the clypeus ; the legs yellow ; 

 the wings hyaline. Abdomen : a triangular spot on each side 

 of the first segment ; the three following segments have each 

 a transverse undulating fascia in the middle, the fasciae are 

 suddenly enlarged laterally into subquadrate macular ; the fifth 

 segment has an ovate spot on each side ; the first four ventral 

 segments have on each side an ovate macula, each in succession 

 smaller, the fourth minute. 



Ha b. Queensland (Moreton Bay). 



Bembex faviventris. 



Female. Length 6-7 lines. Black above and variegated 

 with yellow markings ; beneath entirely yellow. Head yellow, 

 with the vertex and upper portion behind black ; antenna? 

 yellow, with a black spot at the apex of the scape above ; the 

 iiagellum above, except the apical joint, black. Thorax : the 

 margin of the prothorax, two abbreviated lines on the nieso- 

 thorax in front, and two minute spots posteriorly close to the 

 scutelium, which has a line at its lateral margins, a transverse 

 line on the postscutellum, and an oblique one on each side of 

 the metathorax inclining inwardly, yellow ; the legs bright 

 yellow, with a narrow black line on the femora and tibise ; 

 wings hyaline. Abdomen : each segment with a transverse 

 undulating line, which is suddenly widened laterally, and 

 the apical segment yellow. 



Male very like the other sex ; but with a large, compressed, 

 obtuse tubercle on the second ventral segment. 



Hob. Australia (Swan River). 



Bembex jla v ilabris. 



Female. Length 6 lines. Black, with the labrum, tibise, 

 and tarsi yellow j abdomen with white fascia}. Head : the 

 clypeus and face with silvery pubescence, the vertex with 

 white pubescence ; a line behind the eyes and the scape of 

 the antennae yellow in front. Thorax : the margin of the 

 prothorax, the tubercles and the tegulse behind, a spot on 

 the mesothorax close to the tegular, a spot on each side of 

 the scutelium, and the postscutellum yellow; the anterior 

 femora in front, and the apex of the intermediate and posterior 

 pairs, yellow ; a black line on the anterior and intermediate 

 tibiae outside. Abdomen : an elongate white spot, pointed in- 

 wardly, on the first segment ; the three following segments have 

 each an undulating white fascia, the first very slightly interrupted, 

 all widening at the lateral margins ; beneath shining black. 



Hab. W. Australia. 



