262 Miss G. Ricardo on the 



Silvius frontalis, ? , sp. n. 



Type ( $ ) and another from Palmerston, N. Australia. 

 In German Ent. Museum Collection. 



A species rather similar in general appearance to Silvius 

 australis, sp. n., but easily distinguished by the different 

 shape of forehead and by the yellowish palpi and legs. 



Length 9-9i mm. 



Face covered with greyish tomentum, a few dark hairs in 

 centre and white hairs on cheeks. Beard white. Palpi 

 yellowish, with black pubescence, long, cylindrical, curved. 

 Antenna reddish, the first two joints paler, with black hairs, 

 the third dark at apex, with an obtuse angle at base of first 

 division, which is large. Forehead same colour as face, 

 parallel, about four times as long as it is broad ; the frontal 

 callus dark brown, shining, almost square, filling up the 

 entire width of forehead, produced posteriorly or with an 

 irregular border, from which proceeds a narrow spindle- 

 shaped prolongation not quite reaching the ocelli. Eyes 

 bare, with two distinct stripes. Thorax reddish brown, with 

 four grey tomentose stripes ; pubescence on these stripes 

 whitish, elsewhere brown. Breast reddish, with grey 

 tomentum and white and black hairs intermixed. Scutellum 

 reddish, with traces of grey tomentum ; a few long brown 

 hairs are visible and some short white hairs. Abdomen 

 reddish brown, the posterior borders of segments grey, 

 tomentose ; pubescence black and rather abundant, at sides 

 on the grey bands silvery white ; underside the same, the 

 grey bands narrower. Legs yellowish, the femora darker, 

 reddish brown, with white pubescence, which is also largely 

 present on the tibiae ; elsewhere it is black. Hings clear, 

 stigma yellow, veins darker yellow. 



Silvius indistinctus, ? , sp. n. 



Type (female) and another in Brit. Mus. Coll. from Ade- 

 laide River, N. Australia. 



Three females in Berlin Museum Collection from Palmer- 

 ston, N. Australia. 



A dull reddish-brown species ; legs and antennae the same 

 colour. Abdomen with traces of lighter-coloured segmenta- 

 tions. 



Length of type 12 mm., others 9-13 mm. 



Face reddish yellow, covered with grey tomentum ; some 

 brownish hairs on cheeks. Beard dirty white in colour. 

 Palpi long and slender, only slightly stouter at base, ending 

 in a rounded point, two-thirds the length of the proboscis, 



