DECAPOD CRUSTACEANS OF THE WEST INDIES 137 



Key to the Species 



Some of the general morphological characters used in this key (e.g., curvatm-e of cervical groove, dentition 

 and contour of anterolateral margin, development of postfi'ontal crest) are rather variable. The most 

 reliable character is the form of the male first pleopod; it should be examined whenever possible before a final 

 determination is made. 



1. Third maxUliped with exopod overreaching ischium; first pleopod of adult 



male armed distally with scattered short stout spines (fig. 39) . Subfamily 



Epilobocerinae 2 



Third maxilliped with exopod not reaching distal margin of ischium; first 

 pleopod of adult male with group of slender spines near aperture of sperm 

 duct but without scattered short stout spines elsewhere (fig. 43.) Subfamily 



PSEUDOTHELPHUSINAE 8 



2. Front delimited dorsally by transverse crest or ridge, usually concealing part 



of true frontal margin from dorsal view 3 



Front curving gradually downward, frontal margin entirely visible in 

 dorsal view 7 



3. Postfrontal crest represented by low, obscurely tuberculate ridge ; all pereiopods 



unusually long and slender Epilobocera gertraudae (p. 139) 



Postfrontal crest well developed, tuberculate; pereiopods not unusually 

 long 4 



4. Third maxilliped with merus broad, distolateral margin rather regularly 



convex 5 



Third maxilliped with merus narrow, subquadrate, distal margin slightly 

 concave 6 



5. Carapace about three-fifths as long as wide . . Epilobocera armata (p. 138) 

 Carapace less than three-fifths as long as wide . Epilobocera granulata (p. 140) 



6. Submedian lobes of true frontal margin visible in dorsal view. 



Epilobocera haytensis (p. 141) 



True frontal margin entirely concealed from dorsal view by postfrontal 



crest Epilobocera sinuatifrons (p. 141) 



7. Third maxilliped with merus slightly concave along distal margin. 



Epilobocera cubensis (p. 138) 



Third maxilliped with merus rather regularly convex along entire distolateral 



margin Epilobocera gilmanii (p. 140) 



8. Front delimited dorsally by strong, tuberculate transverse crest; third maxilli- 



ped with exopod less than one-third as long as lateral margin of ischium . 9 



Front curving gradually downward, not delimited dorsally by transverse crest; 



thu'd maxilliped with exopod more than half as long as lateral margin of 



ischium 11 



9. Chela with prominent, swollen protuberance on outer surface at base of fingers; 



third maxilliped with merus rather regularly convex along entire distolateral 



margin Guinotia garmani garmani (p. 147) 



Chela without prominent protuberance on outer surface; third maxilliped with 

 merus concave distally 10 



10. Cervical groove nearly straight Guinotia dentata (p. 143) 



Cervical groove curving posteriorly near anterolateral margin. 



"Pseudothelphusa" affinis (p. 148) 



11. First pleopod of adult male with distal margin appearing sinuous and trans- 



versely truncate in posterior view (fig. 43e) . 



Pseudothelphusa americana (p. 149) 



First pleopod of adult male with distal margin appearing concave and obliquely 



truncate in posterior view (fig. 43/) . . . Pseudothelphusa terrestris (p. 150) 



