BY THOMAS G. SLOANE. 373 



Black, shining ; elytra dark purple, brighter towards sides, 

 marginal channel greenish-blue; lateral channel of prothorax of 

 a bluish tinge. 



Head smooth, subquadrate (3*5 x 5-2 mm.), convex across 

 occiput; front depressed; facial sulci short, lightly divergent 

 posteriorly ; median frontal space not divided from occiput; 

 lateral frontal spaces abruptly declivous externally, lightly raised 

 at base above sides of occiput ; clypeus with median part 

 truncate, intermediate angles obtusely dentiform, narrow at base 

 and projecting sharply from margin of head on outer side ; 

 preocular sulcus distinct, short ; preocular process narrow, 

 convex on outer edge; eyes depressed; one supraorbital 

 puncture on each side. Antennas setaceous, lightly compressed. 

 Prothorax transverse (4 - 3 x 6*8 mm.), wider between anterior 

 than between posterior angles; sides lightly rounded; anterior 

 angles shortly advanced, widely obtuse ; posterior angles 

 rounded, not marked ; base shortly lobate, obliquely truncate 

 towards sides; basal lobe wide, rounded; sinuosity on each side of 

 base wide; border reflexed, wide on sides, very widely reflexed at 

 posterior angles, narrower on basal lobe; marginal channel wide; 

 median line strongly impressed; two marginal punctures on each 

 side. Elytra a little wider than prothorax (10 - 5 x 7"1 nun.), 

 rather depressed; sides lightly rounded, widening very gently 

 behind shoulders ; base emarginate, strongly (not roundly) 

 declivous; humeral angles prominent; border reflexed, reaching 

 peduncle, strongly upturned and prominent (not dentiform at 

 humeral angles; margin wide, especially on apical curve; a catenu- 

 late series of evenly placed fine punctures along sides; three 

 punctures on each side of basal declivity. Presternum with 

 intercoxal part longitudinally impressed, base truncate and uni- 

 punctate at each angle. Posterior legs light, posterior coxse 

 impunctate. Length 20, breadth 71 mm. 



Hob.— Nickol Bay, W.A. (Coll. French). 



A very distinct species; it differs from G. interioris, SI., by the 

 elytra being longer, less strongly rounded on sides, and with pro- 



