COLLECTED IN DUTCH NEW GUINEA. 409 



Genus Baccha. 

 Baccha Fabricius, Syst. Antl. p. 199 (1805). 



41. Baccha bicolor. 



Baccha bicolor Austen, Proc. Zool. Soc. London, p. 137 (1893). 



2 $ . Mimika River, July 1910. 



1 ? . Wataikwa River, Aug. 1910. 



Austen's type, a male from Mysol, differs in having a small, nearly clear space at 

 the base of the wing, but these specimens belong, without much doubt, to the same 

 species. 



Subfamily Merodontinse. 



Genus Eristalis (sens. lat.). 

 Eristalis Latreille, Hist. Nat. Crust, et Ins. xiv. p. 363 (1804). 



42. Eristalis (Lathyrophthalmus) placens. 



Eristalis placens Walker, Proc. Linn. Soc. London, vii. p. 211 (1864). 



1 ? . Mimika River, Aug. 1910. 



Walker's type, which was from Mysol, differs from the present specimen in having 

 the hind-femora reddish towards the base and apex instead of almost entirely black, 

 but the former may possibly be immature. An unnamed specimen in the British 

 Museum Collection from Celebes [A. R. Wallace) agrees entirely with the New Guinea 

 specimen before me. Possibly Walker's E. suavissimus may be a form of the same 

 species, but the pale markings of the abdomen are much larger. 



43. Eristalis {}. Phytomia) muscoides. 



Eristalis muscoides Walker, Proc. Linn. Soc. London, iii. p. 96 (1859) ; de Meijere, Nova 

 Guinea, v. p. 85, pi. i. fig. 11 (1906). 

 1 2 . Mimika River, July 1910. 

 Known already from New Guinea, also from the islands of Aru and Amboina. 



Genus Helophilus. 



Elophilus Meigen, Illiger's Mag. ii. p. 274 (1803). 

 Helophilus Meigen, Syst. Beschr. iii. p. 368 (1822). 



44. Helophilus (Mesembeius) hilaeis. 



Helophilus hilaris Walker, List Dipt. Brit. Mus. iii. p. 605 (1849). 



1 d . Mimika River, July 1910. 



Apart from Walker's type, the origin of which is unknown, the National Collection 

 possesses three specimens from Queensland (T. L. Bancroft, F. P. Lodd, and 



R. Hacker). 



3 M 2 



