494 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



Type species: Ronco sosa, new species. 



Relationship : This genus is closely related to Pseudomoera Schellen- 

 berg (1929), of which the unique type species is P. gabrieli (Sayce 

 1901) described from Australian freshwaters at an altitude of 1500 

 feet. Ronco differs from Pseudomoera in its bilobed upper lip, its 

 slender mandibular palp, and the unequal lobes of maxilla 2. 



It differs from Paramoera Miers by the poorly setose inner plate of 

 maxilla 1 and the well-developed inner lobes of the lower lip and from 

 Djerboa Chcvreux by the lack of an accessory claw on pereopods 1-5 

 and the nonlinear gnathopods. 



It is especially related to Eusiroides Stebbing, differing only by the 

 strongly bilobed upper lip. Species of Eusiroides bear very stout 

 spines on the gnathopodal palms. 



Ronco sosa, new species 



Figure 8 



Diagnosis: With the characters of the genus. 



Descriptive notes : The eyes are quite large and black, with the side 

 lobes of the head broadly rounded in front, not notched; rostrum 

 small; upper Up notched; pereopods 1 and 2 with a large distal spine 

 on article 6; third pleonal epimeron quadrate behind. 



Holotype: USNM 106871, male, 2.2 mm. 



Type locality: Abbott station 31-D-2, Ifaluk Atoll, Sept. 4, 1953. 



Material: Abbott stations 31-D-2 (1), 160-165-J-5 (1); Bayer 

 station G3S (1). 



Distribution : Ifaluk Atoll, Caroline Islands. 



Family Synopiidae (incl. Tironidae) 



Synopia variahiUs Spandl 



Figure 9 

 Synopia variabilis Spandl, 1923 [not seen].— Spandl, 1924, pp. 48-50, fig. I7a-g- 



Material: Abbott station 194-E-2 (2); Reish stations E-52 (12), 

 E-182 (1). 



Distribution: Red Sea; Ifaluk and Eniwetok Atolls. 



Family Gamraiaridae 



Paraceradocus micramphopus Stebbing (1910a) should be transferred 

 to the genus Metaceradocus Chevreux (1925), of which it forms the 

 third species. 



Genus Elasmopus Costa 



A key to this genus is presented on pages 497-498. The following 

 species are omitted: 



