/. unicavatus 



265 



relatively short and broad, uniformly broad along their length ; article 2 

 half the length of 3 ; article 4 terminal, clearly visible. Legs relatively 

 long and slender, the intermediate articles whitish distally; coxa I 

 without internal spur, with an external spur longer than broad and 

 an anterior spiniform prolongation ; coxae II-IV with external spur 

 and anterior prolongation as in coxa I, the anterior spine growing 

 progressively smaller on coxae II-IV ; tarsi long, tapering obliquely 

 distally. 



Fig. 265. 



Fig. 266. 



Fig. 265. I. unicavatus ? : capitulum and scutum. (Neumann, 1908, Fig. 1.) 

 Fig. 266. /. unicavatus o : capitulum and scutum, capitulum in ventral aspect, coxae, 

 spiracle, anal grooves and tarsus 4. Drawn from specimen found on gannet, Bass, 

 Scotland, vi. 1910. (W. Evans coll. Original, G. H. F. N. del.) 



Fig. 267. I. unicavatus larva : capitulum and scutum, capitulum in ventral aspect, 

 coxae, anal grooves and tarsus 3. Drawn from specimen found on cormorant, Fidra 

 Point, Firth of Forth, Scotland, xi. 1906. W. Evans coll. Found with ? and o. 

 (N. 1132. Original, G. H. F. N. del.) 



„ r 18 



