Corixidae and Notonectidae of southern Western Australia 
189 
humeral width 2.2-2.3x median length. Lateral 
margins straight, diverging, posterior margin 
medianly emarginate. Facial tubercle very slightly 
raised. Labrum, basal width subequal-1.3x median 
length. Both facial tubercle and labrum with 
scattered short semi-erect hairs. Chaetotaxy of 
front leg (Figure 21). Rostral prong (Figure 22). 
Stridulatory comb (Figure 23) with 19 pegs. 
Remarks 
In Brooks (1951) the form from South Western 
Australia keys out to deanei Brooks. A. hyperion is 
easily distinguished by the apex of the 3rd rostral 
segment not being wider than the base of the 4th as 
it is in deanei. 
ACKNOWLEDGEMENTS 
1 wish to thank Dr I.A.E. Bayly (Monash 
University) for sending me his collections from 
South Western Australia and for his very helpful 
comments on the first draft of the manuscript. 
Finally to Dr Faye Cheal (Murdoch University) for 
sending me various samples from the Perth area 
and permitting me to include some of her data in 
this account. 
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Manuscript received 6 April 1994; accepted 31 January 1995. 
