DECAPOD CRUSTACEANS OF THE WEST INDIES 127 



Family Portunidae 



Subfamily Portuninae 



Genus Callinectes 

 Key to the Species 



1. Central trapezoidal (metagastric) area on carapace nearly or quite three 



times as wide anteriorly as long Callinectes ornatus (p. 132) 



Central trapezoidal (metagastric) area on carapace little more than twice as 

 wide anteriorly as long 2 



2. Submedian pair of frontal teeth large, reaching nearly as far forward as lateral 



pair Callinectes bocourti (p. 127) 



Submedian pair of frontal teeth small or absent 3 



3. Teeth on anterolateral margin of carapace directed outward, not curving 



noticeably forward; lateral spine often considerably more than twice as long 



as posterior margin of preceding tooth 4 



Anterolateral teeth of carapace curving forward; lateral spine less or little 

 more than twice as long as posterior margin of preceding tooth .... 5 



4. Submedian pair of frontal teeth small but distinct; first pleopods of adult 



male (fig. 376) reaching about to suture between sternites supporting third 



and fourth pereiopods Callinectes danae (p. 130) 



Submedian pair of frontal teeth rudimentary or absent; first pleopods of adult 

 male (fig. 37/) reaching beyond suture between sternites supporting first 

 and second pereiopods Callinectes sapidus (p. 133) 



5. Anterolateral margin of carapace strongly arched; first pleopods of adult male 



(fig. 37c) reaching about to suture between sternites supporting third and 

 fourth pereiopods, tips curving mesially . . Callinectes exasperatus (p. 131) 

 Anterolateral margin of carapace not strongly arched; first pleopods of adult 

 male (fig. 37d) falling far short of suture between sternites supporting third 

 and fourth pereiopods, tips divergent . . Callinectes marginatus (p. 131) 



36. Callinectes bocourti A. Milne-Edwards 



Figures 35, 37a 



Callinectes Bocourti A. Milne-Edwards, 1879, p. 226 [type-locality: MuUins 



River, 20 miles south of Belize, British Honduras]. 

 Callinectes Cayennensis A. Milne-Edwards, 1879, p. 226 [type-locahty : (French) 



Guiana]. 

 Callinectes bocourti. — Rathbun, 1930, p. 128, text-figs. 15g, 16e, 17h, 18f, 



pi. 55.— Holthuis, 1959, p. 201, text-fig. 47, pi. 5: fig. 2. 

 Callinectes Boucorti — V^lez, 1967, p. 42. 



Diagnosis. — Carapace with central trapezoidal (metagastric) area 

 nearly half as long as anterior width; anterolateral margins moderately 

 arched; anterolateral teeth curving slightly forward; lateral spine 

 usually less than twice as long as posterior margin of preceding tooth. 

 Submedian pair of frontal teeth large, reaching nearly as far forward as 

 lateral pair. First pleopods of adult male diverging, then recurving 

 mesially in distal half, reaching beyond suture between sternites 

 supportmg first and second pereiopods; distal portion armed laterally 



