278 U.S. NATIONAL MUSEUM BULLETIN 236 



The following keys may serve to distinguish between the various 

 species: 



Key to the Species of Phyllopodopsyllus 



FEMALES 



1. Furcal rami longer than anal somite, more than 3 times as long as maximal 



width 2 



Furcal rami about as long as anal somite, about 2 times as long as maximal 

 width 7 



2. External margin of furcal rami with single seta inserting halfway along that 



margin P. minor (Thompson and A. Scott) 



External margin of furcal rami with 2 setae 3 



3. Long, terminal seta on furcal rami strongly swollen at base 4 



Long terminal seta on furcal rami not swollen at base 5 



4. 3rd exopodal segment of leg 4 with total of 6 setae . . P. furciger G. O. Sars 

 3rd exopodal segment of leg 4 with total of 7 setae ... P. bermudae Lang 



5. 1st endopodal segment of leg 2 with internal seta. Spur on 2nd antennular 



segment small, knob-shaped P. briani Petkovski 



1st endopodal segment of leg 2 without internal seta. Spur on 2nd antennular 

 segment strongly developed, acutely pointed 6 



6. Furca straight; 1st segment of endopodite leg 3 without internal seta; 2nd 



segment of endopodite leg 4 with 2 setae P. minutus Lang 



Furca weakly sigmoid; 1st segment of endopodite leg 3 with 1 internal seta; 

 2nd segment of endopodite leg 4 with 3 setae. P. longicaudatus A. Scott 



7. Furca cylindrical, internal and external border parallel. Strong apical seta 



short, lli times as long as furca, swollen at base .... P. pauli Crisafi 

 Furca basally strongly swollen. Strong apical seta on furca lengthened . . 8 



8. Proximal part of internal furcal wall strongly swollen and spinulose. 1st 



segment of endopodite leg 2 without seta P. bradyi (T. Scott) 



Proximal part of external furcal wall strongly swollen. 1st segment of 

 endopodite leg 2 with 1 seta P. thiebaudi Petkovski 



MALES 



1. Segment 1 of endopodite leg 3 with 1 internal seta 2 



Segment 1 of endopodite leg 3 without internal seta 5 



2. Spur scarcely visible, knob-shaped 3 



Spur strongly developed, acutely pointed 4 



3. Furca 5 times as long as wide, slightly tapering, with longitudinal carina, 



placed close to internal wall. Baso-endopodite of leg 5 with 3 setae, the 

 more median of which is normally developed .... P. briani Petkovski 

 Furca 3 times as long as wide, slightly swollen at proximal part of internal 

 margin. Baso-endopodite of leg 5 with 3 setae, of which the more median 

 is short P. thiebaudi Petkovski 



4. Internal 2 of 5 marginal setae of exopodite leg 5 strong and broad; 2 of 3 



setae of baso-endopodite of leg 5 also thickened . . P. bradyi (T. Scott) 

 All setae of leg 5 normally developed P. longicaudatus A. Scott 



5. 3rd segment of exopodite leg 4 with 3 internal setae, bringing total number of 



appendages on this segment up to 7. 2nd endopodal segment of leg 4 with 



2 setae P. bermudae Lang 



3rd segment of exopodite leg 4 with 2 internal setae, bringing total number of 

 appendages on this segment up to 6. 2nd endopodal segment of leg 4 with 

 1 seta P. minutus Lang 



