211 



Miss G. RIcardo on TabaiiiJge from 



broader anteriorly, about four times as long as it is broad, 

 covered, with grey tomeutum ; frontal callus brown, pear- 

 shaped, M'ith short lineal extension ; pubescence scanty, 

 white ; ocelli distinct. Tliorax blackish, covered with grey 

 tomeutum ; pubescence black, with some oppressed white 

 liairs. Scutellam same colour. Abdomen black with black 

 pubescence; bands of white hairs on posterior borders of the 

 first four segments, not reaching the middle of segment ; 

 underside black with three complete white bands. Leys 

 black with black pubescence. Wings dark brown, pale at 

 the extreme apex, with a clear streak below the stigma, 

 and the extreme edge of the posterior border of wing 

 aLo pale. 



Silvins ferguso7ii, $ , sp. n. 



Type (female) from Nelson Island, Hawkesbury River, 

 New Soutli Wales, 26. 2. 16. 



This handsome species, named after the donor, is nearly 

 allied to Sllvius nifjripennis, sp. n., from the northern part of 

 Australia ; but is distinguished by the pale base of wing. 

 These two species, together with Sllvius grandis, sp. u.,forra 

 a group unlike the typical forms by their larger size and 

 dark abdomens marked with paler segmentations, and by 

 their coloured wings. 



Tliis species measures 17 mm. 



Face covered with light ashy-grey tomentum and with 

 some silvery-white hairs in centre of face, and longer, more 

 numerous ones in the furrows between the face and the 

 cheeks, joining the beard of same colour. Pu/jji blackish, 

 with some ashy-grey tomentum, and short dark hairs; they 

 arc large and stout with an obtuse point. Antenme black, 

 the first two joints with black hairs, the third large and 

 wide at the base with a distinct angle. Subcallus same 

 colour as face. Forehead, same colour, narrow, parallel, 

 about six times as long as it is broad anteriorly ; the frontal 

 callus black, shining, not reaching the eyes, pear-sha{,ed, 

 witii a long stout lineal extension reaching the ocelli. 

 Thorax blackish brown, somewhat shining, with two grey 

 tomentose stripes and grey at sides ; pubescence chietiy 

 black; some white hairs on the stripes; pubescence on 

 shoulders long, black, with tufts of white hairs at base of 

 wings. Scutellum the same colour. Abdomen blackish 

 brown, the first two segments with broad grey tomentose 

 bands, which are represented on the lemaining segments 

 (july at the sides; these bands have white hairs, thickest at 



