164 ANNALS OF THE QUEENSLAND MUSEUM. 
front than in A. 8-costata, slightly sinuate at base, posterior angles 
not produced, obtuse but distinct, margins strongly thickened and 
raised at sides and channelled within, very fine at base, obsolete a.t 
apex, base truncate, surface and margins under a lens perceptibly 
punctate, otherwise smooth. Scutellum transversely triangular. 
Elytra ovate, convex, wider than prothorax at base, a little longer 
than wide (8x7 mm.), shoulders round, sides slightly widening" to 
beyond halfway, apical declivity very steep, very narrowly bordered 
(only evident from above at shoulders and apex). Each elytron 
with 4: costae, the first sub-obsolete and smooth not extending to 
base, the second and third more strongly raised, the fourth near 
sides rather undefined and interrupted, only distinct on apical half,, 
the suture smooth and costate towards apex. Intervals not at all 
rugose, irregularly but not closely covered with large deep punc- 
tures, with the usual lateral row of punctures. Underside nitid 
black, epipleune smooth, abdomen very closely and finely punctate, 
basal segments wrinkled, prosternum transversely rugose, its pro- 
cess finely margined, its apex produced into a fine tooth ; under- 
side of femorai punctate, the posterior and intermediate tibia? 
clothed on the inside with a thin line of red tomentum. 
Dimensions : 13 x 7 mm. 
Habitat : Kookynie, West Australia. 
Two specimens sent by Mr. Duboulay present no sexual 
characters beyond the evident organ of the male, but are evidently 
closely allied to A. 8-costata, Gebien. Of the latter species I have 
specimens from Nungarra and Day Dawn (the latter being the 
author's locality), which are clearly identified. My species differs 
from that of Herr Gebien in its larger size, clearly punctate head, 
the much thicker border of pronotum, the different sculpture of the 
elytra (the costre less raised, intervals not at all rugose, the punc- 
tures more distant and distinct, and its prosternal process, inter 
alia. 
ONOTRICHUS n. gen. 
Mentum transversely cordiform, submentum with a wide hori- 
zontal lateral lobe, mandibles simple ; last joint of the maxillary 
palpi triangular; gula rugose; head large with elevated convex 
ridge between the eyes, allowing only a partial inclusion by the 
prothorax; eyes small, sub-vertical, widely separated; canthus 
