NO.1J04. PARASITIC COPEPODS—CALIGID.E— WILSON. 557 



11. Males, genital segment elliptical; fifth legs not visil)le dorsally. 



mfedans (Heller, 1865). 

 12. Genital segment l>arrel-shaped, longer than wide, sides strongly curved; fifth 



legs large rnininms ( Otto, 1828) . 



12. Genital segment (luadrate, much wider than long, emarginate posteriorly; fifth 



legs small borealis (Olsson, 1877). 



13. Males, fifth legs plainly visible dorsally 14. 



13. Females, fifth legs i)lainly visible dorsally 15. 



13. Females, fifth legs not visible dorsally 16. 



14. Genital segment semilunar, <leeply lol)ed; free segment very short, almost con- 

 cealed dorsally cadrodonti (Baird, 1850), p. 652. 



14. Genital segment acorn-shaped, deeply lobed; twice as wide as free segment; lobes 



acute bidisfx (Steenstrup and Lutken, 1861 ), p. 601. 



14. (Jenital segment ol)long, no lobes; narrower than free segment; fourth legs very 



long nanus ( Krijyer, 1863). 



14. (ieuital segment obcordate, lobes short; three times as wide as free segment. 



parvus (B-Smith, 1898, a). 

 15. Genital segment acorn-shaped, rounded posteriorly; furca long and narrow. 



borealis (Olsson, 1877). 

 16. Genital segment oblong, widened jiosteriorly; abdomen much longer than wide. 



dublns (T. Scott, 1894). 

 16. Genital segment quadranguhir, corners square; abdomen the same length and 



width gracilis ( Dana, 1852 ) . 



17. Abdomen more than half the length of genital segment 18. 



17. Abdomen much less than half the genital segment 23. 



18. Males, genital segmen*, but little wider than abdomen 19. 



18. Females, both the fifth and sixth legs visil)le dorsally 20. 



18. Females, only the fifth legs visible dorsally 21. 



18. Females, neither fifth nor sixth legs visible dorsally 22. 



19. Genital segment spindle-shaped; fourth legs with three saber-like spines. 



labracis (T. Scott, 1902). 

 19. Genital segment orbicular, as wide as long; fourth legs with one toothed 



spine curias (Miiller, 1785), p. 578. 



19. Genital segment cylindrical, sides parallel; fifth legs invisible dorsally. 



cheilodaclyll (Kroyer, 1863),. 



20. Genital segment triangular isonyx (Steenstrup and Lutken, 1861), p. 602. 



21. Genital segment obcordate, lobes large; abdomen club-shaped, narrow. 



minimus (Otto, 1828). 

 21. Genital segment rectangular, no lobes; abdomen as wide as long. 



labracis (T. Scott, 1902). 

 21. (ienital segment acorn-shaped, no lobes; abdomen spindle-shaped, longer 



than wide latiqii ( Kn'iyer, 1863). 



22. Genital segment oblong, no lobes; fourth legs only reaching its center. 



cartas (Miiller, 1785), p. 578. 

 22. Genital segment obcordate, as wide as long, with short lobes; fourth legs reach- 

 ing abdomen </urnurdi ( Kroyer, 1863). 



22. Genital segment barrel-shaited, wider than long; lobes short; toothed plates on 



fourth-leg spines teres, new species, p. 649. 



22. Genital segment ovate, no lobes; whole body covered with spots of rust color. 



rufimaculatus, new species, p. 561. 

 22. Genital segment l)arrel-shaped, wider than long; no lobes; al)domen narrow; 



l)ody highly col( )re(l (jaiji ( Nicolet, 1849). 



22. Cienital segment ellii)tical, lobes short; terminal claws on first legs bipartite. 



schistunijx, new species, p. 564. 



Proc. N. M. vol. xxviii— 04 36 



