78 NKW AUSTRALIAN ASILID^, 



tose spots, in addition to two short white lines on the 

 anterior margin, and a fine white dorsal line, which ex- 

 tends from the anterior margin to a little beyond the 

 middle of the dorsum ; the wnole dorsum bears very s;hort 

 stiff black pubescence, and there are also a few long black 

 lateral a^nd posterior bristles; scutellum small, black, with- 

 out bristles. Abdomen black, with foremargins of seg- 

 mentsi silvery-white, the white colouration being narrow 

 centrally, bread laterally ; the anal segmeiit may be en- 

 tirely white or only a little whitish ; the abdomen is 

 bare, except for a little very short pubescence, which is 

 white on the anterior segments, black at apex. Legs 

 with the femora swollen, with inconspicuous white pubes- 

 cence, and Cine or two small, white apical bristles; tibiae 

 brownish yellow, apex black, the whole bearing scattered, 

 long, white bristles; tarsi brownish-yellow, with apex 

 black, the whole bearing remar'kably long white bristles. 

 Wings hyaline, but the course of the veins sometimes 

 sha-ded faintly with brown; the posterior cells are open, 

 the c^nly one showing any sign of contraction being the 

 fourth, which is narrowed on the wing margin to about 

 half its breadth ; anal cell closed, and connected with the 

 wing margin by a short petiole ; halteres brown. 



This species is remarkably distinct. It can be at 

 once recognised b}?^ its venation and by the black and 

 white abdomen. As before mentioned, it bears a very 

 close resemblance to a Therevid, but its true relationsnip 

 can be easily ascertained by examining the form of the 

 face, moustache, antennae, proboscis, and slender neck. 



This interesting species was discovered by Dr. Fer- 

 gusron, who tells me that he found it occumng commonly 

 on the edges of a dam at Nevertire, N.S.W., on March 20, 

 1915. It is su!?2;estive that it occurred in company with 

 two species of Therevidce, of about the same size, one of 

 which, an undescribed species of Ldnrliorhipirhii'i, resembles 

 it almost exactly in colouration, the thorax being a simi- 

 lar tint of brown, with similar white spots, and the 

 abdomen being also black and white, though the white 

 colour occupies the hind instead of the foremargins ; the 

 general resemblance between the two species is, however, 

 very striking, and would suggest either mimicry or a 

 parallel development of species of two distinct families 

 brought about by similar conditions. 



Stenopogon, Loew. 



Of this genus two species are recognised in Miss 

 Eicardo's revision of the family ; a third, perfectly dis- 

 tinct species, however, occurs not uncommonly in New 



