74 



RECORDS OF THE AUSTRALIAN MUSEUM. 



dimple the bottom of which is pierced by the ventral pores. On 

 the sterna 32, 33, 34, and to a lesser degree 31 and 35, the 

 median sulcus assumes the shape of a deep, wide, abrupt sided 

 furrow running through from the anterior to the posterior margin. 

 Whether this structure is normal or due to the 

 state of preservation of the only specimen at 

 hand, could not be decided. Further backwards 

 the sulcus grows fainter but never disappears 

 entirely. 



Porous area wanting on the first and second 

 segment, single from the third to about the 

 twenty-fourth, and divided into two areas from 

 there on up to the penultimate segment ; the areas 

 are difficult to discover on dark well chitinized 

 specimeus, especially backwards, unless the 



Fig. 32. S. rain- 

 boivi, Brolem. 

 Last leg-bear- 

 ing segment, 

 dorsal vie w 

 (s o m e w li a t 

 schematized). 



teguments should 

 be prepared on 

 purpose. The 

 sterna are covered 

 with numerous 



hairs ; these are 

 very short, except 

 the two marginal 

 pairs which are 

 of moderate lengt h. 



Last t e r g u in 

 almost as long as 

 broad at the base, 

 sides strongly con- 

 verging, somewhat 

 excised behind the 

 middle and run- 

 ning into the 

 posterior margin 

 which is rather 

 rounded. 



Fig. 33. S. rainbowi, Brolem. Last leg-bearing 

 segment, ventral view. 



Last sternum wide, its anterior margin wider than the sternum 

 of the preceding segment, truncate, with lateral margins strongly 

 converging backwards ; its surface is divided by: a faint median 

 furrow. 



