176 U.S. NATIONAL MUSEUM BULLETIN 2 60 



have dimorphic first antennae but the elongated article 3 of female S. 

 walkeri suggests that dimorphism is not unusual. 



Syri'hoUes cohasseta differs from S. trux, new species, in the absence 

 of a tooth on pleonite 4, the smaller tooth of pleonite 3, the occurrence 

 of distinct teeth on pleonites 1 and 2 and pereonites 6 and 7, and by the 

 presence of a distinct cusp on pleonal epimeron 3. 



SyiThoites cohasseta is closely related to S. dulcis, new species, but 

 differs in the thinner, more strongly downturned rostrum, the lack of a 

 distinct tooth on pleonal epimeron 2, and the longer antenna 1. 



The lack of a distmct tooth on pleonal epimeron 2, the slender gna- 

 thopods, the rostral shape and the long antenna 1 are characters dis- 

 tinguishing /S. cohasseta from S. silex, new species. 



Male /S. cohasseta resembles the female of jS. redox, new species, but 

 differs by the occurrence of peduncular processes on uropods 1 and 2. 



Distribution. — Middle Baja California, 1205-1720 m. 



Syrrhoites dulcis, new species 



FiGUBE 86 



Diagnosis or male. — Rostrum long, of medimn thickness, projecting 

 nearly horizontally; lateral cephalic lobes projecting slightly, irregu- 

 larly truncate, anteroventral corners romided; antennae slender but 

 antenna 2 not elongated, articles 1 and 2 of antenna 1 iiiterequal in 

 length, article 3 half as long as 1 or 2, article 1 with 2 distal teeth 

 hidden from lateral view; accessory flagellum 3-articulate, article 3 

 very short; gnathopods slender, article 5 of gnathopod 2 of medium 

 elongation ; anteroventral corner of coxa 1 romided-quadrate, anterior 

 edge deeply concave, posteroventral corner of coxa 3 rounded-quadrate, 

 posterior edge scarcely excavate, coxa 4 with strongly oblique ventral 

 (seemingly posterior) margin and scarcely any posteroventral pro- 

 trusion ; pereopods 1 and 2 with long setae on article 5 and only one or 

 no seta on poseterior edge of article 6 ; article 2 of pereopod 5 very 

 broadly expanded, posteroventral corner rounded-quadrate, ventral 

 edge horizontal but extended downward to end of article 3, posterior 

 edge with very fine serrations; dorsal carina weak, commencing on 

 pereonite 3, becoming conspicuous on pereonite 7, not produced to 

 teeth on pereonites 1-7, pleonites 1-5 with poorly projecting dorso- 

 posterior teeth, tooth on pleonite 5 longest, straight, teeth of pleonites 

 2 and 3 scarcely uptuiTied, very sharp ; pleonite 4 with acute, upturned 

 posteroventral tooth above insertion of uropod 1 ; posteroventral cor- 

 ner of pleonal epimeron 1 rounded, of 2 with medium-sized sharp tooth, 

 of 3 with posterior portion of ventral margin obliquely beveled, 

 posteroventrally produced to medium-sized sharp tooth, posterior edge 

 short ; epimera poorly or not setose ; peduncle of uropod 1 with short 



