560 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



46. Genital segment triangular, much larger than carapace; abdomen longer than 



rest of body pharaonis ( Nordmann, 1832 ) . 



46. Genital segment acorn-shaped; basal abdomen joint three times the terminal. 



pelamydis (Kroyer, 1863), p. 594. 



47. Males, fifth legs not visible in dorsal view 48. 



47. Females, fifth legs plainly visible in dorsal view . . .49. 



47. Females, fifth legs concealed in dorsal view 50. 



48. Genital segment cylindrical, little wider than abdomen; median carapace lobe 



projecting its full length behind the lateral lobes.. cossacki. (B-Smith, 1898, b). 



48. Genital segment obovate, twice as wide as abdomen; median carapace lobe not 



projecting at all constrictus (Heller, 1865). 



48. Genital segment barrel-shaped, three times as wide as abdomen; first abdomen 



joint the longer affinis ( Heller, 1866) . 



48. Genital segment oblong-obovate, twice as wide as abdomen; terminal abdomen 



joint the longer productus (Dana, 1852), p. 597. 



49. Genital segment flask-shaped, no lobes; abdomen narrow; joints the same 



width .diaphanus (Nordmann, 1832). 



49. Genital segment obcordate, deeply lobed; basal abdomen joint twice as wide 



as terminal robustus (B-Smith, 1898, b). 



50. Abdomen joints about equal in length 51. 



50. Abdomen joints very unequal in length .- 52. 



51. Genital segment acorn-shaped, longer than wide; fourth legs weak, three-jointed. 



cossacki (B-Smith, 1898, b). 

 51. Genital segment orbicular, wider than long; fourth legs medium-sized, four- 

 jointed torpedinis ( Heller, 1865 ) . 



52. Genital segment oblong, deeply lobed; basal abdomen joint ten times the 



terminal arii ( B-Smith, 1898, b) . 



52. Genital segment oblong, slightly lobed; basal abdomen joint three times the 



terminal cybii (B-Smith, 1898, a). 



52. Genital segment elliptical, lobes long and very wide; basal abdomen joint 



three times the terminal bonilo, new species, p. 589. 



52. Genital segment flask-shaped, no lobes; basal abdomen joint twice the ter- 

 minal affinis ( Heller, 1866). 



53. Genital segment elongate-obovate, contracted anteriorly; fifth legs invisible; 



abdomen joints equal mutabilis, new species, p. 573. 



53. Genital segment broad, acorn-shaped; fifth legs visible; basal abdomen joint three 



times the terminal chorinemi ( Kroyer, 1863 ) . 



53. Genital segment obovate, lobes short; basal abdomen joint four times the ter- 

 minal irritans ( Heller, 1865). 



54. Abdomen distinctly longer than the genital segment 55. 



54. Abdomen about the same length as the genital segment 56. 



54. Abdomen considerably shorter than the genital segment 57. 



55. Genital segment orbicular, showing both the fifth and sixth legs, female. 



stromatei (Kroyer, 1863). 

 55. Genital segment triangular; only the fifth legs showing; fourth leg spines flat- 

 tened into lamina; platytarsi ( B-Smith, 1898, b). 



55. Genital segment obcordate, little wider than abdomen; fifth legs concealed. 



hirsutus (B-Smith, 1898, a). 

 55. Genital segment elliptical, three times as wide as abdomen; fifth legs concealed. 



productus (Dana, 1852), p. 597. 

 56. Genital segment elliptical, lobes long and narrow; free segment long and wide. 



monacanthi (Kroyer, 1863) 607. 



56. Genital segment oblong-obovate; lobes short and broad; free segment short, 



narrow productus (Dana, 1852), p. 597. 



