and Gyrinidae of Australasia. 419 



less important subject of difference) are on the whole less thickly 

 grouped together. H. sinuatocollis differs from H. Meadfootii and 

 others inter alia by its transverse thoracic fovea. 



So far as I know, this species has been taken only by Mr. Bake- 

 well, who has kindly presented examples from his cabinet to the 

 British Museum, and has also placed it in my own collection. 



23. H. Meadfootii, n. sp. 



H. ovatus, s?<6parallelus, crebre punctatus, niger, vel niger flavo macu- 

 latus. 



Long. corp. 1-1| lin., lat. f lin. 



Ovate, more or less rounded in form, subpubescent, thickly punctate, 

 fuscous black : head finely punctate, in colour either black, or fuscous 

 black with a medial flavous marking, or flavous with a basal margin of 

 black, or flavous : thorax with the sides subparallel ; near the base is a 

 broad shallow transverse depression, more or less definite in different 

 examples ; in colour as varied as that of the head, either black with 

 flavous margins, or flavous with a medial marking of black, or flavous 

 entirely : elytra fuscous black, in many examples marked more or less 

 broadly with flavous ; these markings for the most part are distributed 

 generally in the form of an ante-medial and also post-medial transverse 

 band, consisting sometimes of two or three linear longitudinal markings 

 on each elytron ; sometimes these markings are almost confluent, and 

 form a distinct but irregular band : leys and antenna rufo-flavous. 



It is not without much examination that I come to the conclusion 

 that the above different patterns of colouring ought to be referred to 

 a single species : I am able to detect no constant difference of sculp- 

 ture or form which enables us to separate them : the examples with 

 the pale thorax are certainly more constant in their pattern and a 

 trifle broader in form, and may possibly, when we know more of this 

 group, require to be separated from the others. 



The species has been received plentifully by Mr. Bakewell from 

 Melbourne. In the collections of the British Museum, B,. Bakewell, 

 Esq., and the Rev. Hamlet Clark. 



2. Steiola in elytkis continuata. 

 24. H. bistrigatus [Chev. MS.]. 

 H. ovatus, planus, subtiliter pubescens, punctulatus, nitidus, rufo-flavus. 

 Long. corp. If lin., lat. f— £ lin. 



Ovate, smooth, very finely punctate throughout, flavous or rufo-flavous : 

 head almost impunctate, rufo-flavous : thorax with the sides parallel, 

 the surface smooth, rufo-flavous, the base being very obscurely fuscous : 



