146 



Scientific Proceedings, Royal Dublin Society. 



The shortness of the fringe to the tibiae and tarsi of the second 

 pair of legs in this littoral form supports Dr. Buchanan White's 

 suggestion [I. c, p. 75) that shore species have the fringe shorter 

 than those found on the open ocean. 



It will be seen that in the insects already recorded from other 

 localities, Austro-Malayan, and Australian forms are about equally 

 mixed. 



EXPLANATION OF PLATES. 



PLATE XII. 



EiG. 1. Dictyotus transversus, x 3. 



EiG. 2. Phygadicus australis, x 3. 



Fig. 3. Limnometra lineata, x 3. 



Pig. 4. Hermaiolates haddonii, x 6. 



Pig. 5. „ ,, (under surface), x 12. 



Pig. 5a. ,, ,, head and rostrum, x 12. 



Pig. 6. ,, ,, front tarsus (magnified). 



Pig. 7. ,, ,, middle ,, ,, 



Pig. 8. „ ,, hind ,, „ 



PLATE XIII. 



Pig. 1. Halohates regalis, ^ , x 4. 



Pig. 2. ,, ,, ,, abdominal segments from beneath, x 6. 



Pig. 3. „ „ ? , x 4. 



Pig. 4. ,, ,, ,, abdominal segments from beneath, x 6. 



Pig. 5. ,, ,, front tarsus (magnified). 



Pig, 6, „ ,, middle ,, with part of tibia (magnified). 



Pig. 7. ,, ,, hind ,, (magnified). 



Pig. 8. ,, ,, larva (well-grown), x 4. 



