BY THE REV. T. BLACKBURN. 525 



flabellate, the flabella having simple margins as usual in the 

 species of this genus. 



W. Australia ; taken by Mr. Meyrick. 



Metriorhynchus semicostatus, sp.nov. 



Ater, elytris rufis ; rostro brevi ; prothorace parum trans verso 

 inaequali, disco areola lanceolata instructo ; elytrorum sutura 

 margine laterali lineis 3 discoidalibus lineaque abbreviata 

 prope scutellum fortiter costatis, intervallis biseriatim can- 

 cellato-punctulatis ; rostro brevi. 



Maris antennis valde compressis, articulis intus apice minus 

 productis. [JLong. 5^, lat. 1-J lines. 



In most species of this genus there are four costae (besides the 

 margins) on each elytron ; in the present species the costa next 

 after the suture becomes obsolete a little behind the level of the 

 apex of the scutellum continuing hindward as merely one of the 

 fine lines that intersect the pairs of rows of punctures. Between 

 the abbreviated costa and the suture on one side and between it 

 and the next discal costa on the other side are two rows of punc- 

 tures, but when the abbreviated costa ends each of these pairs of 

 rows of punctures changes into a single row, and in consequence 

 of this sculpture the first (i.e., nearest to the suture) of the entire 

 cost?e is considerably deflected outward in its front part. 



Only one species of Metriorhynchus having only the central 

 areolet of the prothorax well defined has been previously described ; 

 it (M. inquimdum, Waterh.) has quadri-costate elytra, which 

 moreover are black with ferruginous margins. The present species 

 is coloured as M. erythrojpterus, Er. Its antennae are like those of 

 M. clientulus, Waterh., (Tr. Ent. Soc. Lond., 1877, PI. il, fig. 79). 

 The penultimate ventral segment in the male is semicircularly 

 excised. All my examples are males ; they do not vary. The 

 rostrum is scarcely longer than the first joint of the antennae. 



Victoria ; Alpine district. 



