BY G. H. HARDY. 57 



Form tricellata, Macquart, is rather large, and comes 

 from Mt. Wellington, Tasmania ; it corresponds to the C. cor- 

 culum of White and Hardy, and not to the original of that 

 name by Newman. This form also has three submarginal 

 cells. 



Form geometrica, Macquart, from Tasmania, invariably 

 has two submarginal cells, and occurs in low localities, never 

 on the mountains. 



Form hermeteles, Schiner, from Sydney, has three sub- 

 marginal cells, but differs from all the others by the absence 

 of the usual fuscous spots in the hyaline area of the wing. 



■ The usual form of C sylvanus in collections has three 

 or two submarginal cells, and occurs on the eastern side of 

 Australia. It was referred to by Schiner as N. tricellata, 

 which must not be confused with Macquart's name; 

 C. calophthalma, Thomson, is the same. 



There is insufficient material in collections to judge the 

 values of Neuria atherix, N. inaculosa, and .V. partita, of 

 Newman, or of A. ohscura, Walker, and C. fulvipes, Bigot, 

 but all these, from their descriptions, appear to be the same 

 as the species here called C. sylvanus, Fabricius. 



Much more material and information are required for 

 the study of this species, but it seems certain that all the 

 forms belong to one species, which varies somewhat under 

 different conditions. 



Comptosia plena. Walker. 

 Atherix plena, Walker, List. Dipt. B.M., ii., 1849, p. 270. 

 Neuria plena. Walker, Ins. Saund. Dipt., 1852, p. 167. 



Note. — This very distinctive species, from Perth, West- 

 ern Australia, resembles the previous only in having fuscous 

 spots on the wing, and differs by the whole wings being more 

 or less uniformly suffused greyish and slightly darker along 

 the anterior border. A further but apparently undescribed 

 species from New South Wales agrees in these characters, 

 and must not be confused with the Western Australian form. 



Comptosia fasciata, Fabricius. 

 Anthrax fasciata, Fabricius, Syst. Antl., 1805, p. 118. Id., 



Wiedemann, Dipt. Exot., 1821, p. 150; and Auss. 



zweifl. Ins., i., 1828, p. 321. Id., Walker, List Dipt. 



B.M., ii., 1849, p. 267. 

 Neuria fasciata, Walker, Ins. Saund. Dipt., 1852, p. 167. 



Id., Schiner, Reise Novara, 1868, p. 129. 



