127 



should perhaps be designated "doubly truncate, with the two 

 truncate faces meeting in an extremely obtuse and non-prominent 

 angle." 



N.S. Wales (Blue Mountains). 



31. opacior, sp. nov. Fem. Ovalis ; minus latus ; depressus ; 

 in elytris sat opacus ; nigro-piceus, palpis pedibusque diluti- 

 oribus, elytris suturam versus manifeste rufescentibus ; 

 supra subtilissime coriaceus ; elytris striolis et lineis subtili- 

 bus elevatis brevibus transversis instructis, in parte laterali 

 sulcis 4 profunde impressis (in parte altera vix manifeste 

 striatis), ad apicem dehiscentibus et ut M. rivularis, Clk , 

 sinuatis ; tibiis anticis ad apicem extus fere recte angulatis. 

 Long., 6 1.; lat., 2| 1. 



Readily distinguishable from all its described Australian allies 

 by its opaque reddish-brown elytra. It agrees with M. rivularis, 

 Clk.. and 31. latior, Clk., in the sinuate apical outline of its 

 elytra : differing from the former inter alia by its much smaller 

 size and from both in its elytra having only four sulci in their 

 lateral portion and scarcely any trace (even close to the base) of 

 any stride between the sulci and the suture. On the anterior 

 portion of its elytra very fine short elevated lines take the place 

 of the impressed striolse usual in the genus, 



Victoria (Mt. Macedon) ; sent by Mr, Kershaw. 



M. paradoxus, Regimb. See note (below) on Dineutes Gouldi., 

 Hope. 



M. {Gyrinus) obliquatus, Aube. In Mr. Masters' Catalogue 

 this species is said to be widely distributed in Australia. Aube 

 quotes it as common to Australia and the " lies de la Sonde." 

 Regimbart in his Monograph of the Gyrinidce gives "Timor" as 

 its habitat. I have examined a large number of Gyrinidce from 

 different parts of Australia, but have not seen any which agree 

 with the description of obliquatus and consider that further 

 evidence is required to establish the occurrence in Australia of 

 that insect. 



DINEUTES. 



D. Gouldi, Hope, I have before me examples from N. Aus- 

 tralia (one of them from Port Darwin, near the original locality) 

 which I believe, in spite of certain discrepancy with the descrip- 

 tion, to be this species, the coloring, size, &c., being sufficiently 

 notable to make it improbable that two species from the same 

 locality would agree in respect of them. The obstacle to consider- 

 ing this identification certain is that the description calls the 

 elytra " ^risjomosa " and adds the information that the median 

 spine is larger than the two lateral ones, — whereas in the insect 

 before me each elytron has only tivo spines. In one example I 



