FISHERY BULLETIN: VOL. 69, NO. 3 



most to anterior margin of median plate; bases 

 of flaps strongly inclined dorsomedially, form- 

 ing depression limited posteriorly by promin- 

 ence; margins of flaps often reflexed ventrally. 



Platelike portion of sternite XIV naked; its lat- 

 eral margins pronouncedly curving posterome- 

 sially, forming deep emarginations with pro- 

 jections fi-om posterior part; basal portions of 



2 mm 



J 



1 mm 



2 mm 



J 



Figure 4. — Trachypenaeus fuscina sp. n., r! 20 mm carapace length, off Cocodrilo, Chiapas, Mexico. Petasma: 

 A. Ventral view. B. Dorsal view. Appendix masculina and proximal portion of endopod: C. Dorsal view. D. 

 Ventral view (endopod displaced). E, Ventromedial view of appendix masculina. F. Sternites XIII and XIV. 

 G. Trachypenaeus faoea Loesch and Avila, f, 18 mm carapace length, Playa Rella Vi.sta, Panama, sternites XIII 

 and XIV. 



640 



