THE CANCROID CllABS OF AMERICA 319 



backward pointing tooth at base of prehensile edge. Legs dark 

 colored in alcohol except the dactyli and distal ends of the propodi; 

 dactyli pubescent, and with long, slender imguicles. Abdomen of 

 immature female subobiong, sixth segment widening distally. 



Color. — Pale orange; posterolateral surfaces above bases of legs 

 black; fingers and dactyli of legs dark colored. (Stimpson.) 



Measurements. — Male holotype, length and breadth of carapace 

 4.6 mm. (0.18 inch) (Stimpson). Immature female (62629), length 

 of carapace 3.5, width of same 4, fronto-orbital width 2.9, width of 

 frontal margin 1.4 mm. 



Range. — Cape St. Lucas, Lower California, Mexico. Valparaiso, 

 Chile. 



Material examined. — Valparaiso, Chile; Jan. 7, 1927; W. L. Schmitt; 

 1 female, immature (62629). 



Genus LOPHOPANOPEUS Rathbun 



Lophopanopeus Rathbun, Bull. Labor. Nat. Hist. State Univ. Iowa, vol. 4, 

 1898, p. 272; type, L. bellus (Stimpson). 



Carapace hexagonal, moderately convex, areolate. Of the five 

 lateral teeth, N, T and S are subequal, prominent; E present but 

 reduced and coalesced with D to a greater or less extent. Front 

 narrow, lobes sinuous. Orbits transverse. Carpus of cheliped 

 longer than wide; lower margin of propodus concave distally. Legs 

 more or less cristate, especially as to the carpus. Third, fourth and 

 fifth segments of male abdomen coalesced. 



Bahamas and Florida to West Indies; west coast of North America; 

 Japan to Australia; West Africa. 



KEY TO THE AMERICAN SPECIES OF THE GENUS LOPHOPANOPEUS 



A'. Upper margin of merus of ambulatory legs not spinulous. 



B'. Carpus of cheliped smooth or nearly so (uneven in young belhis). 



C Color of immovable finger running far back on hand-.frontalis, p. 323. 

 C^. Color of immovable finger not running back on hand. 



D^ Carapace rough about the antero-lateral and frontal regions. 

 Hand with a very slight lobe above at posterior end; lobe often 



absent 1 bellus, p. 320. 



D^. Carapace smooth except on outer half of hepatic region. Hand 



with prominent lobe above heathii, p. 322. 



B^. Carpus of cheliped very rough. 



C^ Carpus of ambulator}' legs strongly bilobed. 



D'. Carpus of cheliped covered with reticulating ridges inclosing 



pits of irregular shape leucomanus, p. 324. 



D^, Carpus of cheliped covered with tubercles. 



E^ Carpus of legs with two thick naked tubercles on upper 

 margin; propodus of last one, two or three legs with a 



lobe diegensis, p. 327. 



E2. Carpus of legs with two compressed tubercles on upper 

 margin; propodus of last three legs with a lobe on upper 



margin bellus, var., p. 321. 



C^. Carpus of ambulatory legs slightly bilobed lockingtoni, p. 325. 



