BY FREDERICK A. A. SKUSE. 383 



Sub-genus Hormomyia, Loew. 

 Hormomyia, Loew, I.e., p. 110. 



438. Hormomyia omalanthi, sp.n. (PI. xvi., fig. 5). 



9. — Length of antennae 0-070 inch ... 1-77 millimetres. 



Expanse of wings 0-120x0 050 ... 3-04x1-27 



Sizeof body 0-135x0-030 ... 3-42x0-76 



Antennae longer than the head and thorax combined, brown, with 

 a short blackish pubescence, 2-+ 12-jointed ; basal joints small; 

 the flagellar joints cylindrical to sub-cylindrical, progressively 

 diminishing in length and thickness, the terminal ones almost 

 elliptical. Head black or deep brown. Palpi dusky. Thorax 

 gibbose, entirely deep brown or black, shining, with two longitu- 

 dinal rows of black hairs, also some black hairs on the sides. 

 Halteres brown, with black pubescence. Abdomen deep brown, 

 covered with black scales and hairs. Legs moderately long and 

 slender, brown, covered with a black pubescence. Wings hyaline, 

 with a blackish pubescence ; veins brown ; opaline reflections. 

 Costal veins with a black pubescence ; first longitudinal vein wide 

 of the costa, running obliquelyinto it, before the middle of the 

 wing ; second longitudinal strong, somewhat arcuated towards the 

 tip, meeting tip of costa a little beyond the apex of wing ; third 

 longitudinal vein distinct, the branches pale ; fork large, the 

 anterior branch rather more than twice the length of the posterior. 

 (Description drawn from dried specimen). 



Hah.— Mowni Kembla, Illawarra District, N.S.W. (Skuse). 

 Bred from dark brown, woody, smooth, somewhat shining, globu- 

 lar, hollow galls, 5 mm. in diameter, found in clusters along the 

 midrib on the underside of the leaves and in dense masses around 

 the stems of Omalanthus populifolius ; obtained in the month of 

 November. The galls were ripe when collected, and the imago 

 emerged a few days after. The larva does not construct a cocoon, 

 and on the emergence of the imago the pupa-case is left hanging 

 to the gall. 



