BY ARTHUR WHITE. 101 



Thorax yellow-brown, with two' well-separated black me- 

 dian stripes, and two doubly-interrupted black side- 

 strii>cs; thoracic bristles entirely black, very short on 

 anterior half, very long on posterior half ; scutellum 

 grey, with two' black marginal bristles. Abdomen dark 

 red-brown or blackish, but always with a red-brown tinge 

 in places, with very short black lateral bristles ; genitalia 

 dark red-brown, with veiy short stiflF black pubescence. 

 Legs with the femora black above, orange-brown below, 

 the line of demarcation between the black and orange- 

 brown not very distinct ; tibise and tarsi orange-brown, 

 with apices of joints black ; the posterior femora have 

 white hair-like bristles below, and all femora stiff black 

 apical and pre-apical bristles above; tibiae and tarsi with 

 black bristles. Wings hyaline or tinged faintly with brown ; 

 the cubital fork hardly contracted, the second posterior 

 cell broad, not waved, and of equal breadth throughout. 

 Halteres brown. 



Female resembles the male very closely, but more 

 blac-k hairs are present in the moustache, and the abdo- 

 men is produced into a long slender ovipositor. 



This species may be distinguished from R. J ant us, 

 which it most closely resembles, by the much darker legs, 

 which are orange-brown instead of pale yellow, by the 

 less contrasted femora, by the red-brown colouration of 

 the abdomen, and by the whitish segmentations being 

 altogether confined to the hindmargins of the abdominal 

 segments. From 1{. mixtipex it is distinguished by the 

 black scutcllar bristles, and black bristles of the legs, 

 and from R. brunneiisi bv the distinctlv banded abdomen, 

 and by the first antennal joint being black instead of 

 red. 



This species I found occurring commonly settled on 

 the ground on the top of the hills at Fern Tmo Gully, 

 Victoria, on December 12, 1914, and I took another speci- 

 men settled on a log on the 16th of the same month. 

 It is not known to occur outside Victoria. 



Rh.\bdotoitamus lautus, Sjj. nnv. 



Face pale yellow ; moustache black above, yellovr 

 below; thorax pale yellow-brown, with two closely-adja- 

 cent dark brown median stripes, and two doubly inter- 

 rupted brown side stripes; bristles of thorax black, but 

 few short white posterior ones may be present; scutellum 

 with two black marginal bristles ; abdomen deep black, 

 with the hindmargins of segments pale yellow-brown, 

 the yellow-brown colour being carried forward on each 

 H 



