131 
RHYTISTERNUS STUARTI, 7. sp. 
Oblong, very depressed ; prothorax quadrate-cordate, sides 
sinuate behind, basal angles rectangular, base (3°3 mm.) wider 
than apex (3 mm.); elytra with four inner striz of each entire 
and strongly impressed. Piceous black, shining; legs and antenne 
piceous. 
Male. Head moderate, convex; frontal impressions deep, 
short, diverging backwards, connected in front by the lightly 
marked clypeal suture; clypeus declivous to labrum; eyes 
prominent. Prothorax transverse (3°3 x 4:75 mm.), widest a 
little behind anterior marginal puncture, lightly convex towards 
sides anteriorly, depressed posteriorly ; disc depressed, trans- 
versely striolate; sides lightly rounded on anterior three-fourths, 
lightly sinuate before base ; anterior margin widely emarginate ; 
base sinuate, lightly emarginate across peduncle, and sloping for- 
ward to the basal angle on each side; anterior angles obtuse ; 
basal angles almost rectangular, their summits obtuse ; lateral 
border thick, reflexed in front of basal sinuosity ; median line 
lightly impressed ; two lateral basal impressions placed in a wide 
depression on each side; the internal short, strongly impressed ; 
the external more strongly marked, wide and arcuate ; space be- 
tween internal basal impressions lightly convex, that between 
external impression and margin narrow, convex, bearing at its 
base the posterior marginal puncture. Elytra depressed, wider 
than prothorax (9 x 5:7 mm.); sides subparallel, decidedly nar- 
rowed to humeral angles; base truncate; apical curve lightly 
and widely sinuate on each side; striz simple, four inner ones 
strongly impressed, entire, fifth lightly impressed, sixth and 
seventh obsolete, except posteriorly, ninth and marginal channel 
as usual in genus; interstices flat; lateral border narrow, re- 
flexed ; basal border forming a prominent obtuse projection at 
each humeral angle above its junction with lateral border. Pro- 
sternum truncate at base; a linear impression just before basal 
margin, causing the base to appear weakly bordered. Ventral 
segments smooth in middle, finely rugulose-punctate laterally. 
Length, 14:°5—-15:25 ; breadth, 5-7—6:1 mm. 
The female is a little wider than the male, but does not differ 
otherwise, except sexually as usual in the genus. 
In shape and general appearance, this species is closely allied 
to f. carpentarius, Sl., the conspicuous differences being that 
only the four inner striz of the elytra are strongly impressed 
(not five as in &. carpentarius), and none of the interstices is 
convex (in &. carpentarius the five inner are); it is, besides, a 
smaller and much flatter insect, and has the sinuosity of the 
apical curve of the elytra less marked. From AR. liopleurus, 
Chaud., its more depressed form and more transverse prothorax 
