COPEPODS OF THE WOODS HOLE REGION 569 



69. End segment of fifth legs linear, eight times as long as wide, 



with 2 unequal apical, and 2 outer setae; basal expansion 



with but 1 seta; muddy bottom 9 Leptocletodes G. O. Sars, 1920 



End segment of fifth legs stout, twice as long as wide, with 2 

 equal apical, 1 outer, and 1 inner setae; basal expansion with 

 5 setae; stomach of shad 9 Leimia Willey, 1923 



End segment of fifth legs three times as long as wide, with 2 

 unequal apical setae; basal expansion elongate, with 1 apical 

 and 3 inner setae; fresh water (Amu River). 



(f 9 Liranocletodes Borutzky, 1926 



70. Exopod of first legs definitely longer than endopod 71 



Rami of first legs subequal, third leg modified in male 72 



Rami of first legs subequal; none of the legs modified in male; 



endopod segments of first 4 pairs of legs subequal in length; 



beach sands cf Paraleptastacus, new genus (p. 248) 



71. Segments of second, third, and fourth endopods subequal; basal 



expansions of fifth legs not reaching the midline, each with 

 4 very unequal setae; muddy bottom. 9 Hemimesochra G. O. Sars, 1920 

 Distal segments of second, third, and fourth endopods two to 

 four times as long as proximal; basal expansions of fifth legs 

 fused, each with 5 setae; muddy bottom 9 Rhizothrix Brady, 1875 



72. Segments of second, third, and fourth endopods subequal, 



tipped with short and very weak setae; fifth legs small and 

 armed with very short setae; shallow lakes, fresh water. 



cf 9 Moraria T. Scott, 1893 



Distal segments of second, third, and fourth endopods longer 

 than proximal, with long, slender setae; fifth legs large and 

 armed with long setae; shallow lakes, fresh water. 



cf 9 Attheyella Brady, 1880 (p. 233) 



73. Rostrum large and broad; metasome twice as wide as urosome, 



with epimeral plates; basal segment of first endopod wider 

 than distal; muddy bottom, shallow.. 9 Stenheliopsis G. 0. Sars, 1906 

 Rostrum small and narrow; metasome passing insensibly into 

 urosome, without epimeral plates; segments of first endopod 

 of equal width; muddy bottom, shallow. 



9 Pseudomesochra T. Scott, 1902 



74. Each ramus of first legs with but a single segment 75 



Each ramus of first legs with 2 or 3 segments 76 



75. Exopods of second and third legs 3-segmented; exopod of 



second antennae 2-segmented, tipped with 4 unequal setae; 

 first antennae made up of 8 segments; littoral, sandy bottom. 



cf 9 Tegastes Norman, 1903 

 Exopods of second and third legs 2-segmented; exopod of 

 second antenna 1 -segmented tipped with 2 equal setae; first 

 antennae made up of 6 or 7 segments; littoral, sandy bottom. 



cf 9 Parategastes G. O. Sars, 1904 (p. 194) 



76. Endopod of first legs made up of 2 segments 77 



Endopod of first legs made up of 3 segments 121 



77. Exopod of first legs made up of 2 segments, rarely of 1 segment 78 



Exopod of first legs made up of 3 segments 83 



