COPEPODA FROM IFALUK ATOLL. 277 



tion of new species. Lang originally distinguished between both 

 genera in the following way: 



Phyllopodopsyllus: 2nd segment of antennule with big spur; 1st 

 endopodal segment of leg 2 without seta; 3rd exopodal segment of 

 leg 2 with 1, 3rd exopodal segment of leg 3 with 2 internal setae. 



Paraphyllopodopsyllus: 2nd segment of antennule without spur; 

 1st endopodal segment of leg 2 with seta; 3rd exopodal segment of 

 legs 2 and 3 without internal setae. 



Nicholls (1944a, p. 493) introduced a new form as Phyllopodopsyllus 

 aegypticus, which in setation is a typical Phyllopodopsyllus but lacks 

 the spur on the antennule. 



Petkovski (1955) described Phyllopodopsyllus briani (p. 126) and 

 Phyllopodopsyllus thiehaudi (p. 130) with a scarcely developed spur 

 on the antennule, 1 seta on the 1st endopodal segment of leg 2, and 

 internal setae on the 3rd exopodal segments of legs 2 and 3. 



A revision of the characters separating both genera, consequently, 

 seems to be indicated. I have, for the present, left both genera 

 separate and I have used, as the only characteristic to discriminate 

 between them, the presence or complete absence of the spur on the 2nd 

 segment of the antennule. It seems likely that the discovery of more 

 species will show that Paraphyllopodopsyllus has no more standing 

 than a subgenus of Phyllopodopsyllus, or it may even sink completely 

 into the synonymy of Phyllopodopsyllus. Nicholls' species must be 

 referred to Paraphyllopodopsyllus in the sense used here, where it 

 should stand as Paraphyllopodopsyllus aegypticus (Nicholls, 1944); 

 Petkovski's species should remain in the genus Phyllopodopsyllus, 

 of which the following species are now known: 



Females Males 



Tetragoniceps Bradyi T. Scott, 1892 T. Bradiji T. Scott, 1892 



T. minor Thompson and A. Scott, 1903 

 Phyllopodopsyllus furciger G. O. Sars, 

 1907 



(=P. furcifer in the explanation of pi. 156) 

 P. longicaudatus A. Scott, 1909 P. longicaudatus A. Scott, 1909 



P. bermudae Lang, 19-18 P. bermitdae Lang, 1948 



P. minutus Lang, 1948 P. minutus Lang, 1948 



P. briani Petkovski, 1955 P. briani Petkovki 1955 



P. thiehaudi Petkovski, 1955 P. thiebaudi Petkovski, 1955 



P. pauli Crisafi, 1960 



The position of the foUomng species is uncertain: 



P. armatus Willey, 1935 P. armatus Willey, 1935 



(probably a Laophontella) 



The following species is a nomen nudum: 



P. dissimilis Brian, 1923 



