I'lO REVISION OF THE THYNNID^ OF AUSTRALIA, I., 



Many species have been received from Mr. C. French, of Mel- 

 bourne, also from Mr. G. A. Waterhouse and others. Every 

 facility has been given by the authorities of the British Museum 

 and the Oxford University Museum for the examination of their 

 extensive collections and libraries. Most of the >.'ortli Queens- 

 land species are from the collection of the late Gilbert Turner. 

 My thanks are particularly due to Mr. W. W. Froggatt for the 

 loan of his large collection from all parts of Australia, containing 

 a large number of carefully sexed specimens taken in the field. 

 It was originally proposed, when we placed our collections together, 

 that this should be a joint monograph of the Thynnid<x, but 

 pressure of private and official work compelled him to withdraw 

 from active participation. 



Key to the Gla-Hsification of the Genera treated of in this pajwr. 



i. Male smaller than the female. 



J". Mandibles tridentate. Maxillary palpi six-jointed; labial 



palpi four-jointed. 



Labrum transverse. First and second recurrent nervures 



received by the second cubital cell close together. First 



cubital cell not divided. Hypopygium unarmed. 



$ . Mandibles quadridentate. Mouth-parts perfect and larger 



than in the male. Subfamily i. D i a ai m i x /E. 



Genus Diamma. 

 ii. Male larger than the female. 



(^ . Mandibles bidentate. First and second recurrent nervures 

 received by the second and third cubital cells, the second 

 very rarely interstitial with the second transverse cubital 

 nervure. Division of the first cubital cell marked either 

 by a scar or by a more or less complete nervure. 



2 . Mouth-parts smaller than in the males, the maxillary palpi 

 more or less rudimentary, mandibles simple, rarely 

 bidentate. Subfamily ii. T h y x n i x .v,. 



A. ^ . Second recurrent nervure interstitial with the second trans- 



verse cubital nervure. Hypopygium broadly and deeply 

 emarginate, without a central spine. Genus 1. Oncorhinus. 



B. J". Second recurrent nervure received near the base of the 



third cubital cell. Hypopygium with a long recurved 

 aculeus. Abdomen elongate. 

 2 . The maxillary palpi never less than four- jointed. 



