HYMENOPTERA. 327 



of its anterior margin; the four following have their anterior 

 margins notched in the middle and sinuated on each side, their 

 posterior margins straight, with a notch in the middle ; the sixth 

 and seventh segments yellow, the latter with a black line in the 

 middle ; beneath, the posterior margins of the segments have a 

 yellow fascia which is attenuated in the middle. 



Hab. Adelaide. 



41. Bembex vespiformis. B.M. 



Female. Length 8 lines. — Black : the face covered with silvery- 

 white pubescence, that on the vertex griseous ; the scape more 

 or less yellow in front ; the flagellum rufo-testaceous beneath ; 

 the anterior margin of the clypeus, the labrum, and mandibles at 

 their base, yellow. Thorax : the scutellum and post-scutellum 

 have a pale yellow dot on each side ; the metathorax denselj' 

 clothed with cinereous pubescence ; wings subhyaline, the ner- 

 vures black ; the coxae and femora black, the anterior femora 

 in front and the intermediate and posterior pairs at their apex 

 above, black ; the tibiae and tarsi yellow ; the anterior and inter- 

 mediate tibiae have a black stripe outside, the posterior pair 

 being black beneath ; the basal joints of the anterior tarsi are 

 black outside and furnished with long cilia. Abdomen : a large 

 macula on each side of the basal segment, pointed M'ithin, and a 

 small angular macula at the extreme lateral margins of the 

 second segment, both of a pale yellowish-white ; the apical seg- 

 ment and apical margin of the fifth segment in the middle, 

 orange-yellow ; beneath, entirely yellow. 



Male. — Closely resembles the female, but with the scape en- 

 tirely yellow ; the second segment with an elevated carina which 

 has its superior margin black ; the apical segment black. 



Hab. Adelaide. 



42. Bembex atrifrons. B.M. 



Female. Length 7 lines. — Black : the labrum yellow, with 

 the base, sides and apex more or less black ; the outer orbit of 

 the eyes, and a minute spot on the scape in front, yellow. Tho- 

 rax : a narrow line on the posterior margins of the prothorax 

 and scutellum yellow; a spot on the tegulse, a line over 

 them and the tubercles, yellow ; the legs yellow, the coxae, tro- 

 chanters, and base of the femora black ; a fusco-ferruginous 

 stripe on the anterior and intermediate tibiic above, and the 

 anterior tarsi furnished with long ferruginous cilia ; the wings 

 hyaline, their nervures ferruginous. Abdomen : the basal seg- 

 ment has on each side a short narrow glaucous stripe, and the 



a 



