148 



RECORDS OF THE AUSTRALIAN MUSEUM. 



the Macleay Museum, and I therefore have much pleasure in 

 associating his name with it, specifically. 



Genus Percosoma, Schaum. 



Percosoma mastersi, sp. nov. 



(Fig. 1). 

 Measurements: — Head (to tips of mandibles) 5 mm. long, 3-5 ram. 

 wide; pro-thorax, 6 mm. long, 69 mm. wide; elytra 11-7 mm. 

 long, 7"3 mm. wide. 



Black, shining, narrow, elong- 

 ate. Head rather large, smooth; 

 transverse impression behind the 

 eyes strongest laterally, faint 

 behind vertex ; vertex rather flat, 

 frontal impressions well defined, 

 short, anterior angle with a row 

 of six punctures ; jaws not long, 

 hooked at apex ; eyes prominent, 

 inclosed behind, projecting before 

 post-ocular prominences — these 

 not strong. Aiitennce subfiliform, 

 clothed with pale, yellowish 

 bristles ; basal joint has a deep 

 round puncture above. Pro- 

 thorax slightly convex, cordate, 

 truncate in front and behind, 

 median line lightly marked ; sides 

 slightly rounded on anterior half, 

 gently narrowed but not sinuate 

 towards base ; lateral border narrow, extending from anterior to 

 posterior angles — the latter somewhat obtuse. Elytra convex, 

 oval, narrow, striate (the strise — seven upon each elytron — very 

 distinct), intermediate spaces flat ; shoulders rounded ; base 

 declivous to peduncle, apex broadly rounded ; lateral border 

 narrow ; within the outer margin of each elytron, there is a row 

 of small punctures, widely separated from each other individually; 

 of these four are seated well forward, one at the centre, and the 

 remainder (four) towards the apex, the last three rather closer 

 together. Ventral surface lightly rugose laterally. Anterior legs — 

 thighs canaliculate below, dilatate at middle ; outer angle of tibia 

 finely serrated. 



Ohs. — Judging from the fact that the anterior thighs are similar 

 to those of the female of P. montana as described by Sloane;* the 

 species diagnosed above is doubtless a female also. 



* Loc. dt., p. 60. 



