628 



femorahis, but the elytra even more rugose (strongly vermicu- 

 late) than on ventralis. 



The described specie6 may be thus tabulated: — 



Mandibles much deeper than wide on apical half. 



Brown and front femora of male simple ... mandibular is 



Black and front femora of male carinated ... femoralis 

 Mandibles wider than deep on apical half. 



Male with a conspicuous pad on basal segment 



of abdomen vn trails 



Male without such a pad Kingi 



Megamerus ventralis, n. sp. 



d • Black and shining. Under-surface with moderately 

 dense stramineous pubescence, becoming condensed into a 

 conspicuous pad on middle of basal segment of abdomen ; a 

 few long hairs about eyes, upper-lip with a conspicuous fringe 

 of golden setae. 



Head with moderately dense punctures, becoming crowded 

 in front. Mandibles coarsely sculptured about base, apical 

 half shining and lightly curved. Antennae moderately stout, 

 conspicuously passing hind coxae, eleventh joint about once 

 and one half the length of tenth, its tip conical and subappen- 

 diculate. Apical joint of each palpus rather stout, dilated 

 from base to about middle, and then parallel-6ided to apex, 

 with a shallow depression near outer apex. Prothorax lightly 

 transverse, sides rather strongly rounded and widest near 

 apex ; irregularly depressed, wrinkled, and finely shagreened, 

 punctures sparser and somewhat smaller than on head. 

 Elytra much wider than prothorax, widest across shoulders; 

 striation well-defined but somewhat irregular on sutural tw T o- 

 thirds, ill-defined elsewhere; interstices irregularly trans- 

 versely impressed, and with a few punctures, becoming 

 vermiculate towards sides. Basal segment of abdomen widely 

 and shallowly depressed along middle, apical segment lightly 

 foveate. Legs comparatively short; hind femora strongly 

 angulate but scarcely dentate; hind tibiae conspicuously 

 dilated to apex. Length ( d , 9)> 20-25 mm. 



9 . Differs in being stouter, eyes less prominent, antennae 

 not extending to hind coxae, basal segment of abdomen 

 evenly convex and without special clothing, apical segment 

 non-foveate, and angulation of hind femora less conspicuous. 



Hab. — North-western Australia (Blackburn's collection); 

 Western Australia (National Museum from C. French). Type 

 d, I. 4153, in South Australian Museum; type 9' i* 1 

 National Museum. 



The specimen from the Blackburn collection is certainly 

 a male, but the apical joint of each of its palpi is much less 



