788 DIPTERA OF AUSTRALIA, 



only a single sub-marginal cell, both characters of the Limnobina. 

 Again, unlike the latter some of these genera exhibit distinct 

 empodia, whilst, on the other hand, some do not have them. In 

 short, although these genera appear, and probably are, arbitrarily 

 grouped together, they certainly cannot be admitted elsewhere ; but 

 in the present state of our knowledge the section is at least a 

 convenient one. 



Genus 7. Rhamphidia, Meigen. 



Leptorliina, Stephens, Catal. etc. 1829 ; Megarhina, St. Fargeau, 

 Encycl. Meth. Ins. X., p. 585, 1825 ; Helius, St. Fargeau. I.e. 

 Index, p. 831 ; Rhamjyhidia, Meig., Syst. Beschr. YI. p. 281, 

 1830 ; Macquart, S. a B. Dipt. I. p. 93, 1834 ; Walker, Ins. Brit. 

 III. p. 308, 1856; Schiner, F. A., 1864; Osten-Sacken, Mon. 

 Dipt. N. Amer. IV. p. 103, 1869 ; Studies II. p. 183, 1887. 



" One sub-marginal cell ; four posterior cells ; a discal cell ; no 

 marginal cross-vein. The tip of the auxiliary vein is at some 

 distance beyond the origin of the second vein ; the sub-costal 

 cross-vein is close at this tip. Rostrum elongated, but shorter 

 than the thorax ; last joint of the palpi elongated. Antennae 

 16-jointec). Tibiee without spurs at the tip; empodia indistinct ; 

 ungues smooth. The forcejDS of the male very like that of 

 Ele2)hantomyia" (Osten-Sacken). 



The rostrum is much longer than the head in three out of the 

 four species known to me ; in R. niveitarsis only a little longer. 



Only a few species of this genus are known, all, I believe, 

 American and European. Four fossil species are stated by Loew 

 to occur in Prussian amber (Bernst. und Bernstein fauna, 1850, 

 p. 37). 



312. Rhamphidia communis, sp.n. (PI. xxi., fig. 9). 



(J. — Length of antennae 0*070 inch ... 1*77 millimetres. 



Expanse of wings 0-380x0-090 ... 9-64x2-27 



Size of body 0-340x0-050 ... 8-62x1-27 



■9. — Length of antennae 0-060 inch ... 1-54 millimetres. 



Expanse of wings 0-380x0-090 ... 9-64x2-27 



Size of body 0-340x0-050 ... 8-62x1-27 



