374 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 43. 



FamUy PHOTID.E. 



CHEVALIA MEXICANA, new species. 



Body smooth without spines or teeth, slender. Head longer than 

 first two segments; body segments progressively longer posteriorly. 

 Eyes round; ocular lobe rounded. Epimera shallow, and none of 

 them excavate nor produced. 



Fig. 5.— Chevalia mexicana. a', first antenna; a', second antenna; g^, first gnathopod; 

 .<7', second gnathopod; mn, mandible; mp, maxilliped; toii, first maxilla; viifi, second 



maxilla; pi, first PER^OPOD; P^, second PERiEOPOD; p^, THIRD PER^OPOD; p*. FOURTH PER^OPOD; 

 p'=, FIFTH PERiEOPOD; t, TELSON; M^, THIRD UROPOD. 



First antenna about two-thirds length of body; first segment of 

 peduncle about as long as third; flagellura 8-segmented; accessory 

 flagellum with a short basal segment, a longer middle, and a minute 

 terminal segment. Second antenna half as long as first; first seg- 



