130 DIPTERA OF AUSTRALIA, 



I. (J antennce about three times the length of a wing. 

 426. Macromastix costalis, Swederus. (PI. v., fig. 21.) 



Tipula costalis, Swederus, Act. Horn. 1787 p. 286 ; Megistocera 

 dimidiata, Westwood, Zool. Journ. V. p. 451, 1830; Ann. Soc. 

 Ent. Fr. IV, p. 682, 1835 ; Trans. Ent. Soc. Lond. 1881, p. 378, 

 pi. XVIII. fig 9; M. dispar, Walker, Ent. Mag II, p. 468, 1835 ; 

 Schiner, Dipt. "Novara" Exp. 1868, p. 39; M. limbipennis, 

 Macquart, Dipt. Exot. I, p. 60, pi. vi. fig. 1, 1838 ; Suppl. 1, p. 

 17, pi. II, tig. 3, 1846; Suppl. IV, p. 16, 1850: M. pacifica, 

 Erichson, Archiv fiir Natur. VIII, Bd. I, p. 270, 1842 ; Macro, 

 thorax ornatus, Jsennicke, Abh. Senck. Natur. Ges. Frank. VI. 

 p. 320, pi. 43, fig. 2, 1867. 



(J. — Length of antennae 2*000 inch* ... 5080 millimetres. 



Expanse of wings 0-700 x 0160 ... 17-78 x 4-06 



Sizeofbody 0460x0-120... 1170x3-04 



$. — Length of antennae 0-090 inch ... 2-27 millimetres. 



Expanse of wings 0-700x0-160 ... 17-78x4-06 



Size of body 0-500x0-090... 12-70x2-27 



Ochreous or brownish ochreous. Head sometimes with two 

 small indistinct dusky spots between the eyes ; in ^ densely 

 covered with tolerably long yellow hairs ; the frontal gibbosity 

 v«ry large, prominent and densely haired in the ^, not at all 

 conspicuous in ^ ; palpi often having the last three joints brownish 

 or even black, sometimes also the first joint ; flagellar joints of 

 antennae brown ; in ^ long and almost filiform ; in Q short, the 

 first four or five elliptical, the rest becoming slender or linear. 

 Thorax considerably lai-ger and more gibbose in ^, also covered 

 with tolerably long yellow hairs in ^ ; the mesothorax usually 

 more brownish or greyish in the 9 ; four darker brownish stripes, 

 sometimes only the two intermediate or often none (more often 

 in (J specimens) traverse the mesothorax ; the intermediate pair 



* About the mean measurement. 



