133 
The female is a little flatter than the male, and is not easily 
separated from the female of A. Stwarti, Sl. 
Closely allied to &. splendidus, Blkb., from which I would 
note the following characters as distinguishing it ; (a) the pro- 
thorax has the basal angles a little more marked, and the sides 
faintly sinuate before them, (b) the elytra have the fifth stria 
less strongly impressed, (c) the ventral segments are opaque, not 
smooth in the middle, and not impressed with a transverse sulcus. 
It must, judging from the description, have a considerable affinity 
to &. cardwellensis, Blkb., but that species has the prothorax 
more dilatate at its widest part, and narrower at the base. 
RHYTISTERNUS ARNHEIMENSIS, Casteln ? 
Male. Narrow, elongate, rather depressed ; prothorax long, 
subcordate, base and apex of equal width (2:3 mm.), sides sinuate 
posteriorly; elytra with five inner strize entire. Black, shining ; 
legs and antennz reddish-piceous. 
Head rather long, widely and obsoletely impressed across 
occiput ; frontal impressions moderate, wide apart, diverging 
backwards, their apices connected by the strongly marked clypeal 
suture ; eyes (with orbit) reniform, less prominent than usual in 
the genus. Prothorax narrow, subcordate (2:7 x 3:2 mm.), widest 
a little before the midd.e, depressed posteriorly; sides very 
lightly rounded, lightly sinuate before base; anterior margin 
hardly emarginate ; base sinuate, a little emarginate in middle 
and sloping lightly and roundly forward to basal angles on each 
side ; anterior angles less obtuse than usual in the genus; basal 
angles well marked, obtuse at summit; lateral border narrowly 
reflexed ; inner lateral basal impression not strongly marked, 
linear ; spaces between them and margin on each side flat (ex- 
ternal basal impression obsolete). Elytra oval (6:8 x 4 mm.), 
depressed on disc; apical curve sinuate on each side; five inner 
strie simple, entire, first and second most strongly impressed, 
sixth and seventh only decidedly marked posteriorly (their course 
perceptible nearly to base); interstices flat on disc (two inner 
ones a little convex), five inner ones convex on apical declivity, 
ninth narrow, convex, punctate, the punctures interrupted in 
middle; lateral border narrow, reflexed; basal border interrupted 
at junction with lateral border. Prosternum roundly sub.trun- 
cate, not margined at base. Ventral segments opaque, minutely 
punctate; this puncturation more marked on basal segments, 
wanting in middle of segments. 
Length, 12; breadth, 4 mm. 
The species described above I believe to be Lhytisternus 
(Omaseus) arnheimensis, Casteln., but the description of that 
species is, unfortunately, too vague to be of any use in identifying 
