130 BULLETIN- 97, UNITED STATES NATIONAL MUSEUM. 



H*. Carapace of female two and a half times as wide as long. 

 Propodus of hist two legs tapering at distal end almost to 



width of proximal end of dactylus tnhicohi, p. 165. 



F*. Propodus of third leg distinctly longer than wide. 

 G'. Carapace very convex, sloping from the middle in all directions. 

 Thumb strap-shaped. Manus much widened toward distal 

 end. Fingers with wide, triangular gape — harnharti, p. 149. 

 G'. Carapace more or less flattened, not sloping from the middle 

 in all directions. Thumb not strap-shaped but diminishing 

 from base. 

 H\ Thumb deflexed. 



J*. Merus of third leg short and stout, about twice as long as 



wide chactoplcrana, p. 151. 



.r. Merus of third leg elongate, much more than twice as 

 long as wide. 

 K\ Thumb subtriangular, the terminal spine forming one 

 point of the triangle. 

 L\ Two short, well separated cardiac crests. Thumb 



slightly deflexed ruldiricnsis, p. 154. 



L*. A single, bilobed cardiac crest. Thumb markedly de- 

 flexed occidcntalis, p. 155. 



K*. Thumb composed of a short, high, quadrate base, fol- 

 lowed by a short, slender spine at lower angle. 

 L\ Palm strongly widened distally, lower margin nearly 



straight. Cardiac ridge blunt brcvipoUcx, p. 1G9. 



L*. Palm very convex below. Cardiac ridge acute. 



affinis, p. IGS. 

 H*. Thumb not deflexed. 



J\ Thumb straiglit or nearly so. Lower margin of palm not 

 con\ex. 

 K\ A cardiac ridge present. No large spine on ischium of 



third leg in male frunciscana, p. IGl. 



K*. No cardiac ridge present. A large spine on ischium of 



third leg In male rciincns, p. 139. 



J*. Thumb curved upward distally. Lower margin of palm 

 convex. 

 K\ Carapace more than twice as wide as long. Dactylus 

 of third leg longer than propodus. Fingers of 



female gaping hiatus, p. 164. 



K*. Carapace less than twice as v/ide as long. 



L\ Carapace laterally tapering. Sides of male abdomen 



convex schiiiilti, p. 162. 



L*. Carajiace laterally subtruncate. Sides of male abdo- 

 men not convex, first segment very wide at base. 



iccijnioutlii, p. 166. 

 B*. Pollex of cheliped represented only by spiniform angle of palm. 



monodacti/ln, p. 136, 



Analogous species. — Besides several pairs of analogous species on 



opposite sides of the American continent, there are also in the genus 



Pinnixa close resemblances between certain species in the northern 



and southern hemispheres, as indicated below. 



