300 HEVISIOX OP GENERA BELONGING TO DIPTEEA BRACHYCERA OF AUSTRALIA. 



Genus Clesthentia White. 



Type, C. aberrans White. Tasmania. 



Affinities. — This genus was originally placed in the family Leptidae (White, 

 1914) and was retained in this family by me in 1919. It is here proposed to 

 transpose the genus to the Therevidae on account of its possessing the following 

 characters : — 



1. The presence of some more or less distinct thoracic bristles situated later- 

 ally and similar to those on other species of Therevidae. 



2. A closed fourth posterior cell. 



3. The absence of a pulvilliform empodium. 



All these characters are contrary to those of the family Leptidae. A re- 

 examination of the supposed tibial spurs shows them to be apical spines similar 

 to those in other genera of the Therevidae. 



Family DOLICHOPODIDAE. 



Arachnomtia cupreus Macquart. 



Hydrophorus cupreus, Macquart, Dipt. Exot., suppl. 4, 1849, p. 123, PI. 

 xii., fig. 2; White, Proc. Roy. Soc. Tasm., 1916, p. 258. — Arachnomyia arborum, 

 White, Proc. Roy. Soc. Tasm., 1916, p. 253, text-fig. 50. 



Synonymy. — The description of Hydrophorus cupreus Macquart agrees in 

 every respect with specimens of Arachnomyia arborum Whit«, so undoubtedly 

 Macquart's species will be found identical with White's when the type is 

 examined; both were described from Tasmania where this species is abundant. 

 Moreover, I believe the genus Hydrophortis does not occur in Australia; not only 

 have I searched for it in Tasmania, New South Wales and Queensland without 

 success, but also it is not represented in any collection 1 have seen. 



List of Works referred to. 



Hardy, G. H., 1919. — Australian Rhyphidae and Leptidae. Proc. Roy. Soc. Tas., 



p. 117. 

 Hkrmann, 1909. — Beitrag zur Kenntniss der Apioceriden. Deut. Ent. Tieit., 



p. 104. 

 KertesZj 1908. — Catalogus Dipterorum, iii. (Erinnidae). 

 Krober, 1912. — Entomolog-ische Mitteilungen, i. 

 LUNDBECK, 1908. — Diptcia Danica, ii. 

 Macquart, 1838.— Dipteres Exotiques, i. (2 pts.). 

 1846.— „ „ Supp. i. 



1847.— „ ., Supp. ii. 



Osten-Sackp:n, 1883. — On the genus Apiocera. Berl. Ent. '/.eit., xxvii., p. 287. 

 RiOABDO, 1912-13. — A revision of the AsiUd-ae of Australasia. Ann. Mag. Nat. 



Hist., ix.-xi. 

 Walker, 1854.— List of the Diptera in the British Museum, vi., Supp. 2. 

 White, 1914. — Diptera Brachyoera of Tasmania, Pt. i. Proc. Roy. Soc. Tas., 



p. 35. 



1915,— Dii)tera Brachycera of Tasmania, Pt. ii. Proc. Roy. Soc. Tas., 



p. 1. 



1917.- New Australian Asilidae. Proc. Roy. Soc. Tas., p. /2. 



Wiedemann, 1830.-~Aussereuroi)aische zweiflugelige Insecten, ii. 

 WiLLisTON, 1908.— Manual of the North American Diptera. 3d. Edit. 



