BY FREDERICK A. A. SKUSE. 375 



black scales ; hoary reflections. Wings broad, hyaline, with a 

 dense blackish pubescence ; membrane, especially in the ^, with 

 dull reflection ; veins dark. Costal and first longitudinal vein 

 with black scales and pubescence ; cross-vein extremely indistinct ; 

 first longitudinal vein visible for the whole of its length ; second 

 longitudinal vein straight, reaching the margin considerably before 

 the apex of the wing ; third longitudinal reaching posterior margin 

 o]3posite or immediately beyond tip of first longitudinal vein, its 

 anterior branch nearly straight and very pale. (Description drawn 

 from fresh specimens). 



Sab. — Sydney (Skuse). Bred from bunches of brown, woody, 

 cylindrical galls formed on the flower-stalks of Acacia longifolia. 

 The full-grown galls are usuallv from 12 to 18 mm. long, and 

 occur in bunches of from two to twenty or thirty tubes ; these 

 tubes are rarely straight, being usually coalescent at the base and 

 bending in an outward direction for their apical half. They are 

 slightly constricted at the mcuth, and clothed inside with a white 

 pubescence which evidently serves to facilitate the egress of the 

 pupa (PL XVI., figs. 1-lb). 



There are two broods in the year ; the galls of the first brood 

 are full-grown in August ; the second, which first appear in 

 September, are full-grown in December or the beginning of 

 January. A white cocoon is formed at the bottom of the tubes, 

 and after the emergence of the perfect insect the pupa-case is left 

 projecting from the orifice. 



c. Flagellar joints of the antennce sessile in $ and $ . 



433. Cecidomyia nubilipennis, sp.n. 



(7-. — Length of antennae 0-047 inch ... 1-18 millimetres. 



Expanse of wings 0-085 x 0-035 ... 2-14x0-88 



Size of body 0-100x0-120 ... 254x0-50 



Antennse half the length of entire body, 2--t- 11-jointed, black ; 

 flagellar joints cylindrical, sessile, shorter towards the end, the 



