THE CANCROID CRABS OF AMERICA 



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Diagnosis. — Carapace very convex, teeth 

 not prominent. Outer orbital angle not form- 

 ing a tooth. Basal article of antenna twice 

 as long as broad. Legs naked. 



Description. — Carapace very convex, except 

 for the marginal rim; cardiac region deeply 

 outlined; otherwise the surface is slightly 

 uneven; granulation visible to naked eye, 

 coarser on elevations; antero-lateral margin 

 multidenticulate or lobulate, divided by closed 

 fissures into 9 rather obscure teeth. One 

 well-defined postero-lateral tooth followed by 

 one or two slight emarginations. The three 

 frontal teeth between the antennae are short, 

 thick and lobiform, the median the smallest 

 and very little overreaching the adjacent 

 pair. Outer orbital angle not advanced in 

 a tooth; extremity of basal article of an- 

 tennae thick and blmit, followed bj^ a small 

 lobe on the orbital margin. Outer margin 

 of merus of outer maxilliped oblique, form- 

 ing a slightly obtuse angle with the anterior 

 margin. Palm with 5 outer and 2 upper 

 carinae; interspaces crossed by transverse 

 rugae. Black color of fingers reaching two- 

 thirds their length from the tips. Legs of 

 moderate length, bare, coarsely granulate; 

 dactyls thick, tapering regularly to the long 

 curved tips. 



Color. — Above reddish-brown, beneath yel- 

 low mottled with reddish (Bell). Young male 

 {annulipes Miers), prevailing color light yellow 

 varied with blotches of dark purplish brown; 

 joints of legs regularly annulated with broad 

 bands of same color. 



Measurements. — Female (14844), length of 

 carapace 85, width of same 126, fronto-orbital 

 width 27.8, width of front between antennae 

 9.8, width between tips of inner orbital teeth 

 14 mm. 



Range. — Ecuador; Peru; Chile as far south 

 as Trinidad Channel. 



Material examined. — Guayaquil, Ecuador; 

 specimen in Copenhagen Mus. 



Callao, Peru; 4 specimens (Paris Mus.). 



