BY THOMAS G. SLOANE. 631 



Tribe PLATYNINI. 



From Horn's table of the Flarpalince hisetosce in his " Genera 

 of Carabidfe," the following features are taken as diagnostic of 

 the Platynini : — 



Mandibles without a setigerous puncture in the groove on outer 

 side; margin of elytra not interrupted posteriorly, and without 

 an internal plica; front normal; penultimate joint of labial palpi 

 bisetose; posterior cox?e contiguous; head not prolonged behind 

 eyes, neck not semigiobose; elytra obliquely sinuate at tip. 



Horn divides the Platynini into three groups, two of which are 



represented in Australia and are separable (after Horn) thus : — 



Eighth elytral stria distant from margin, not deeply impressed. Platynides. 



Eighth elytral stria confluent with margin in its basal half, deeply impressed 



and attaining suture Perigonides. 



Group Platynides. 



The Australian genera of the group Platynides may be tabulated 

 as follows (following Horn's table of genera) : — 



Ungues more or less serrate. Mentum toothed. (Tarsi hairy above. Elytra 

 without dorsal punctures) Pristonychus. 



Ungues not serrate. Elytra with dorsal punctures. Mentum toothed. 



Tarsi with 4th joint not bilobed Platynus. 



Tarsi with 4th joint bilobed, Colpodes. 



Pristonychus has only one described Australian species, viz., 

 P. australis, Blackburn (1888), which is found in Western 

 Australia, South Australia, and Victoria.^" 



Genus Platynus. 



I tabulate the Australian species known to me as under : — 



A. Elytra with 8th interstice not narrow and convex at apex. 



b. Prothorax transverse, strongly narrowed on sides to base and apex. 



c. Elytra viridigeneous with narrow testaceous margin; legs pale 



P. marginicoUis, Macl. 



* This is probably an introduced species, viz., the European P. complanatus, 

 which is said by Horn to be rather widely spread by commerce over the globe 

 (Trans. Am. Ent. Soc. ix. 142). Mr. J. J. Walker has given me a specimen 

 taken by him at Port Adelaide, which he considers P. conipUoiatus (a species 

 unknown to me in nature) and which I identify as P. austndis, Blkb. 



