738 AUSTRALIAN AND TASMANIAN PSELAPHID.E, 



The dark club, which is rather larger than usual, with the 

 acute armature of the front trochanters, render this species very 

 distinct. 



The eleventh joint is slightly paler than the tenth, but not 

 distinctly so, and is considerably darker than the basal joints. 

 From some directions the tenth joint appears feebly bidentate on 

 one side, but this appearance (although alike on two specimens) 

 may be due to the clothing. One specimen was seen by M. 

 Raflfray some years ago, but returned without comment. 



Rybaxis atriclava, n.sp. 



(J. Dark reddish-castaneous, head and abdomen black; append- 

 ages, club excepted, almost flavous. Upper surface with short 

 pale pubescence, more noticeable on abdomen than elsewhere. 



Head with a round closed fovea of moderate size close to each 

 eye, and with a fairly deep interantennal impression. Antennae 

 comparatively thin, first joint cylindrical, fifth slightly longer 

 than fourth or sixth, sixth than seventh, and seventh than eighth, 

 ninth larger, tenth still larger, eleventh rather briefly subovate, 

 about as long as ninth and tenth combined. Prothorax not much 

 wider than long, widest and strongly rounded at about one-thiid 

 from apex; latero-basal fovese and connecting impression as in the 

 preceding species. Elytra moderately long, each slightly produced 

 in middle of apex; dorsal striae deep at base, and distinct almost 

 to apex; with fairly distinct but irregularly distributed punctures; 

 epipleural furrow fairly deep, lightly curved and rather nearer 

 marginal stria than usual. Upper surface of abdomen with two 

 small medio-basal nodes. Melasternum on each side, exactly 

 half-way between the middle and hind coxae, raised into a very 

 obtuse tubercle, the apical inner portion feebly striated. Front 

 tibicB very feebly dentate at the middle; hind pair spinose at 

 apex. Length 1| mm. 



5. Differs in being thinner, antennae shortei", abdomen convex 

 along middle of undersurface, raetasternum unarmed and not 

 striated, and legs unarmed. 



Hab. — Victoria : Mallee (National Museum). 



