120 U.S. NATIONAL MUSEUM BULLETIN 2 60 



Type-locality.— Station 7234, 27°38'00'' N, 115°16'16'' W, 791- 

 842 m, Jan. 2, 1961. 



Eelationship. — The generic position of this species is not clear; 

 its gnathopods have aspects of the genus Oed'weroides Stebbing but its 

 second antenna is neither enlarged nor distinctly spinose as in that 

 genus. Except for its gnathopods, which have poorly developed lobes 

 on the posterior margins of the fifth articles and which do not guard 

 the sixth articles, this species might be assigned to Monoculodes Stimp- 

 son; it would join taxa such as Monoculodes latissimaniis Stephensen 

 (1931) , which also has poorly developed posterior lobes. Monoculodes 

 sudor intergrades Oediceroides and Monoculodes by virtue of its 

 gnathopods while Monoculodes hroyeri Boeck intergrades the two 

 genera in its intermediate second antenna. Those facts, however, are 

 not conclusive evidence that the two genera should be merged. 



Monoculodes sudor is assigned to Monoculodes mainly on the con- 

 dition of antenna 2. In that genus it bears comparison to M. glyconica 

 J. L. Barnard (1962d), a sympatriot having distinct eyes, a slightly 

 shorter second peduncular article on antenna 1, a broader, less quadrate 

 lateral cephalic lobe, a more weakly produced posterior lobe on article 

 5 of gnathopod 1 and a slightly more strongly produced lobe on gnatho- 

 pod 2. Monoculodes scdhricidosus K. H. Barnard (1932) differs from 

 M. sudor in the same ways that M. glyconica does. 



Monoculodes sudor resembles several species in the genus Oedicer- 

 oides. It is close to O. antennatus K. H. Barnard (1937) because the 

 second peduncular article of antenna 1 is longer than the first, a char- 

 acter otherwise unique to O. antennatus in the genus Oediceroides. 

 But M. sudor has a much longer first antenna than that described for 

 O. antennatus. 



Except for antenna 1 and its second article, M. sudor is similar 

 to O. lim,pieza J. L. Barnard (1961) but differs from it by the ter- 

 minally rounded, not excavate telson. Monoculodes sudor differs from 

 0. j)lumicomis K. H. Barnard (1925) in the absence of plumosities on 

 the first antennal setae and the relative equality of the antennae. From 

 O. proximus Bonnier (1896) , which it resembles in the minutely tuber- 

 culate dorsum of the pleon, covered with down, M. sudor differs in its 

 first antenna and the weaker posterior lobe of article 5 on gnathopod 2. 



Oediceroides wolfji J. L. Barnard (1961) has a shorter rostrum and 

 bulkier posterior processes on article 5 of gnathopod 2 than does 

 M. sudor. The rostrum of O. loeheri Pirlot (1932) is more down- 

 turned and the gnathopodal lobes are longer than in M. sudor. 



