154 NOTES ON AUSTRALIAN CYNIPIDiE. 



and shining, with a few scattered hairs all over it; metathorax 

 black beneath, and thickly clothed with black hairs. Abdomen 

 black, covered with fine hairs. Wings fuscous, upper margin of 

 forewings darkest, stigma black, nervures almost black. Legs 

 covered with fine hairs. 



The gall is very common on Acacia discolor in the month of 

 November, when the pupa of the Cynips will be found wrapped 

 up in a black pupa case in the gall when opened. It is formed 

 on the twigs where a leaf bud or small shoot is commencing to 

 sprout ; sometimes it simply forms an oval swelling at the base of 

 the shoot, but the typical form is an oval gall produced into three 

 irregular horns at the apex, formed out of aborted leaf buds. It 

 is very much infested by a small black Chalcid that attacks the 

 gall and changes it into a shapeless fleshy mass ; scores ot these 

 minute parasites will hatch out ot' a single gall. 



Locality: Rose and Double Bays, Thornleigh, N.8.W. 



Cynips ACACi^-LONGiFOLiiE, n.sp. 



Length of body, 2 lines. Expanse of wings, 4^^ lines. 



Head, thorax, antennse, and centre of upper side of abdomen 

 from below second segment to tip of abdomen ochreous-yellow ; eyes 

 and ocelli dark brown ; first two segments of abdomen and the 

 edges of the following ones black, the colour fading in old specimens 

 to an ochreous-brown; coxse and femora dark brown; underside of 

 abdomen black. Antennae inserted below the eyes in a depression ; 

 13-jointed; 1st slender, cylindrical; 3rd-4th small, funnel-shaped; 

 5-lOth rounded at base and square at apex; ll-13th forming 

 a club ; all from the second joint margined with fine hairs. Head 

 rounded in front and not hollowed behind ; eyes and ocelli dark 

 brown. Prothorax narrow ; middle lobe of mesonotum large, 

 rounded in front, lateral lobes wedge-shaped ; scutellum large, 

 rounded in front, heart-shaped. Abdouen broad and rounded at 

 base, with a depression in the centre, rather pointed at apex. 

 Wings large, hyaline ; costa and nervures black ; forewings 

 clouded with a fuscous patch about | from the tip of wing. Legs 

 clothed with fine hairs. 



