414 Mr. F. Smith on new Species 



yellow ; tips of the mandibles black ; the flagellum of the an- 

 tennas fulvous beneath. Thorax : a narrow line on each side 

 of the posterior margin of the prothorax, and another on each 

 side of the postscutellum, yellow ; wings subhyaline, with a 

 faint cloud beyond the stigma ; nervures fuscous ; tegulas 

 yellow ; the tips of the femora, the tibiae, and tarsi ferruginous, 

 the anterior and intermediate tarsi have the first joint white, 

 the posterior pair are slightly fuscous above. 

 Hah. Australia (Lower Plenty, Victoria) . 



Cerceris sceva. 



Female. Length 3^-4^ lines. Black, very closely and 

 strongly punctured ; variegated with yellow and ferruginous 

 spots and fascias. Head : clypeus elevated and truncate ; the 

 mandibles, clypeus, sides of the face as high as the insertion of 

 the antennas, a narrow carina between them, and sometimes a 

 minute dot behind the eyes, yellow. Thorax : two spots on 

 the collar, two on the postscutellum (these are frequently 

 obsolete), and the tegulas yellow ; wings subhyaline ; a fuscous 

 stain in the marginal cell, which extends to the apex of the 

 wing ; tips of the femora, the tibiae, and tarsi ferruginous ; the 

 basal joint of the anterior and intermediate tarsi whitish. 

 Abdomen : the second segment black at the base and more or 

 less so down the centre, at the sides ferruginous, and with 

 a yellow spot ; the fourth and fifth segments with a narrow 

 yellow fascia on the apical margin. 



Hah. Victoria (Lower Plenty, &c). 



This is a variable species : sometimes the apex of the first 

 segment of the abdomen is ferruginous ; occasionally the apical 

 segment is entirely so ; the third segment rarely more or less 

 ferruginous ; the scape of the antennas usually yellow in front, 

 and the flagellum fulvous beneath. The male varies princi- 

 pally in the colouring of the abdomen ; it is sometimes yellow 

 at the base and ferruginous beyond, with a black spot in the 

 middle, or it is half yellow and half black ; the thorax black, 

 with two minute yellow spots on the collar. 



Cerceris aurantiaca. 



Female. Length 5 lines. Pale orange-coloured ; the fourth 

 segment of the abdomen, the mesothorax, and a macula on 

 the vertex black ; closely punctured. Head : a short carina 

 between the antennas; the clypeus oblong, curved, and elevated; 

 a black macula on the vertex encloses the ocelli, and extends 

 to the insertion of the antennas, it is somewhat heart-shaped, 

 and unites with a black broad line at the summit of the eyes, 



