558 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxviii. 



28. Fifth legs visible (lorsally; males ur females; genital segment sulxiuadrate. 



ahhrrriatus (Kn'iyer, 1863). 



28. Fifth legs invisible dorsal ly, alM'cinales 24. 



24. Genital segment reetangular, miieli idugcr tiuui wide, no lobes; sides nearly par- 

 allel breiicaudatuH (A. Scott, 1901). 



24. Genital segment rectangnlar, much wider tlian long, no lobes; sides nearly par- 

 allel pnnui^ ( B-Snuth, 1.S98, a) . 



24. Genital segment oljovate, as wide as long, sides strongly curved; small plates on 



free segment cenfrodouli (Baird, 1850), \). 652. 



24. Genital segment obovate, deeply lobed; lobes acute, conical; free segment nar- 

 row and long halixtir (8teenstrup and Liitken, 1861 ), p. 601. 



25. Abdomen three-jointed; genital segment tlask-shaped, truncate posteriorly. 



aiic/uMatns (Kroyer, 1868). 



25. Alxlomen two-jointed, of varying lengths 26. 



25. Abdomen one-jointed, of varying lengths 84. 



26. Abdomen longer than the genital segment, males or females 27. 



26. Alxlomen al>out the same length as the genital segment 28. 



26. Abdomen half as long as the genital segment or more 81. 



27. Males, genital segment (juadrangular; free segment as wide as long. 



h!r^ntu>i (B-Smith, 1898, a). 

 27. Males, genital segment narrow s[)indle-shaped; five segment four times as 



wide as long IjhhHo, new species, j). 589. 



27. Females, genital segment acoin-shaped; free segment twice and a half as 



wide as long. .-. chdifer, new species, p. 582. 



28. Males, fifth legs visible dorsally; genital segment acorn-shaped; first abdomen 



joint smaller n>l,ii.'<lii!< { B-Smith, 1898, b). 



28. Males, fifth legs invisible dorsally 29. 



28. Females, fifth legs plainly visil)le 30. 



28. Females, fifth legs invisilile dorsally; genital segment oldong; basal abdomen 

 joint the longer ri/l/tl (B-Smith, 1898, a). 



29. Genital segment barrel-shaped, only a little longer than wide, corners angu- 



lar tlii/iiiiii (Dana, 1852), p. 608. 



29. (Jenital segment narrow, clu})-shaped, twice as long as wide, corners rounded. 



Iricliiiirl (Kroyer, 1863). 

 30. (ienital segment obcordate; basal abdomen joint four times the terminal. 



n>hnslu.'< (B-Smith, 1898, b). 

 30. Genital segment oblong, widest posteriorly; terminal abdomen joint much the 



longer tlnjinnl ( Dana, 1852), p. 608. 



81. Males, fifth legs not visible dorsally 32. 



31. Females, fifth legs not visil)le dorsally 33. 



32. (fenital segment orlnenlar, half as widt' as carai)ace; basal abdomen joint short 



and wide infestans (Heller, 1865). 



32. (ienital segment ellii>tical, one-tiiinl as wide as carapace; basal abdomen joint 



quadrangular Inrmiiloiiis ( Kr()yer, 1868) , p. 606. 



83. Genital segment oblong, narrowed anteriorly; deeply emarginate posteriorly; 



1( ibes long infcxlaiis (Heller, 1865 ) . 



33. (tenital segment flask-shaped; slightly emarginate posteriorly; lobes short 



and broad hcluncs ( Kroyer, 1863), p. 586. 



33. (Tenital segment orbicular, as long as wide, evenly rounded; basal abdomen 



joint longer rr.nitor (Heller, 1865). 



34. Abdimien obconical, longer than the genital segment; the latter flask-shaped; 



males .jihipsoni (B-Smith, 1898, a). 



84. Abdomen same length as genital segment; the latter oblong; fourth legs short 

 and weak; females duhius (T. Scott, 1894). 



