A REMARKABLE NEW GALL-THRIPS FROM AUSTRALIA. 



By H. H. KarnY; Ph.D. (Communicated by W. W. Froggatt.) 



(Six Text-flgTires.) 



[Read 26th July, 1922.] 



Mr. W. W. Eroggatt discovered recently a very interesting thrips-gall on 

 the Belali {Casuarina Cambagei) growing- in the western scrub at Trangie, N.S.W., 

 which lie was good enough to send me for determination of tlie gall-former. 



The galls (Text-fig. 1) represent a vei^ remarkable type, hitherto not 

 known as caused by thrips. The twigs are swollen at some places and form 



'^ 



Text-fig. 1. Thaumatothrips froggatti, n.gen. et. sp. 

 Gall on a Casuarina twig- a. outside; b. inside. Natural size. 



large, knob-shaped thickenings, inside of which are cavities, full of all stages 

 of the gall-former. These cavities communicate with the exterior by small holes 

 through which the thrips are able to come out. 



