THE CANCROID CRABS OF AMERICA 427 



two small open notches and an intermediate lobe ; inferior margin with 

 a large outer notch; inner tooth prominent. Inner orbital hiatus 

 wide; basal article of antennae not reaching, or barely reaching, pro- 

 longation from front. Endostome usually marked by a slight ridge 

 on either side which does not extend to the anterior margin. Cheli- 

 peds unequal in both sexes, and usually roughened by sharp granules 

 or spinules. Fingers pointed. Legs slender, usually spinulous above. 

 Abdomen of male with third to fifth segments fused. 



Small species, ranging from Cape Hatteras, North Carolina, to Cape 

 Frio, Brazil; Bermudas; from Santa Monica, California, to the Gala- 

 pagos Islands; Hawaiian Islands. To a depth of 250 fathoms. 



KEY TO THE AMERICAN SPECIES OF THE GENUS MICROPANOPE 



A'. Last lateral tooth of carapace obsolescent. 

 B'. General appearance of carapace smooth. 



C. Color of immovable finger continued on palm. Wrists rough 



areolata, p. 450. 

 C^. Color of immovable finger not continued on palm. Wrists nearly 



smooth nitida, p. 448. 



B^. Carapace uneven or rough or both. 



C^. Carapace deeply areolated all over. Legs unarmed. Chelae high 



and heavy, Glyptoplax-like pusilla, p. 431. 



C^. Carapace areolated and rough anteriorly. Legs spinulous. 



D*. Second lateral tooth small but distinct. Anterior carapace and 



wrists finely granulate lobifrons, p. 429. 



D2, Second lateral tooth fused with the first and scarcely distin- 

 guishable. Anterior carapace and wrists deeply eroded. 



sculptipes, p. 428. 

 A^. Last lateral tooth of carapace small but easily discernible. 

 B^ Color of immovable finger continued on palm. 



C^. Submedian lobes of front triangular, prominent. Chelae heavy. 



Palms with a blunt crest above cristimanus, p. 454. 



C^. Frontal lobes straight latimanus, p. 433. 



B^. Color of immovable finger not continued on palm. 

 CK Palms mostly smooth. 



Di. Lateral projections dentiform. 



El. No tooth at outer angles of front. Cardiac region granu- 

 late. Chelae similar^o lata, p. 441. 



E-. A small tooth at outer angles of front. Cardiac region 



smooth. Chelae dissimilar poUta, p. 440. 



D^. Lateral projections spiniform spinipes, p. 443. 



C^. Palms entirely or mostly rough. 



D^. Granulation of carapace mostly in lines. Chelipeds coarsely 

 granulate. 

 E^ No notches in upper margin of orbit. Palms without 



longitudinal grooves granulimanus, p. 439. 



E2. Two notches in upper margin of orbit. Palms with three 

 longitudinal grooves on upper-outer surface. 

 F'. Granulation of carapace fine, squamose; transverse 

 lines sHghtly marked xantusii, p. 438. 



w As this si)ecies was founded on a single specimen, the similarity in chelae may be abnormal. 



