Petrolisthes tonsorius, new species 85 



Petrolisthes cabrilloi Glassell 88 



Petrolisthes cinctipes (Randall) 90 



Petrolisthes granulosus (Guerin) 94 



Petrolisthes laevigatus (Guerin) 97 



Petrolisthes violaceus (Guerin) 99 



Petrolisthes holotrichus Nobili 102 



Petrolisthes schmitti Glassell 104 



Petrolisthes brachycarpus Sivertsen . . . . . . . . 106 



Petrolisthes platymerus, new species 108 



Petrolisthes crenulatus Lockington 110 



Petrolisthes ortmanni Nobili 112 



Petrolisthes leivisi le^isi (Glassell) 113 



Petrolisthes leivisi austrinus, ne-w subspecies 115 



Petrolisthes cocoensis, new species 117 



Petrolisthes artifrons, new species 119 



Petrolisthes hians Nobili 121 



Genus Neopisosoma, new 123 



Neopisosoma bicapillatum , new species 124 



Neopisosoma mexicanum (Streets) 127 



Neopisosoma dohenyi, new species 129 



Genus Pachycheles Stimpson 131 



Pachycheles chacei Haig 135 



Pachycheles calculosus, new species 136 



Pachycheles setimanus (Lockington) 139 



Pachycheles crassus (A. Milne Edwards) 141 



Pachycheles biocellatus (Lockington) 144 



Pachycheles 'vicarius Nobili 147 



Pachycheles marcortezensis Glassell 149 



Pachycheles <velerae, new species 150 



Pachycheles spinidactylus Haig 153 



Pachycheles panamensis Faxon 155 



Pachycheles trichotus, new species 157 



Pachycheles subsetosus, new species 159 



Pachycheles monilifer (Dana) 160 



Pachycheles pubescens Holmes 162 



Pachycheles crinimanus, new species 164 



Pachycheles grossimanus (Guerin) 167 



Pachycheles rudis Stimpson 170 



Pachycheles holosericus Schmitt 173 



vi 



