340 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



conformation of Eusymmerus, with the evenly rounded lateral margins 

 of the pereion and pleon, stands in contrast to the irregular nature 

 of these margins in the narrower and less dorsoventrally flattened 

 Eonalea and Erichsonella. 



Boone's description, although detailed, contains a few misleading 

 statements. Although it was stated in her paper that her Erichson- 

 ella pseudoculata and other isopods described therein would "be more 

 fully discussed and illustrated in a forthcoming monograph," this 

 monograph has not appeared. We are therefore providing illustra- 

 tions of taxonomically important details and an emended description 



of Boone's species, 



RonaleOf new genus 



Diagnosis: Body narrow; lateral margins of pereion and pleon 

 irregular. Flagellum of antenna 2 uniarticulate. Palp of maxilliped 

 composed of four segments. Coxal plates distinct from the segments 

 in pereion segments 2-7, visible dorsally in segments 5-7. Abdomen 

 composed of a single segment with a pair of incomplete lateral sutures 

 at the base. Type species, R. pseudoculata (Boone). 



Ronalea pseudoculata (Boone), new combination 



Erichsonella pseudoculata Boone, 1923, pp. 154-155. 



Male holotype: Length 8.2 mm., greatest width at level of perei- 

 onite 1, 2.5 mm., USNM 50420. 



Female: Oostegites fully developed, length 9.0 mm., greatest width 

 at level of pereionites 3-4, 2.5 mm. 



Head: Frontal lamina conical, reaching level of distal end of first 

 segment of antenna 1 , tip evenly rounded in female, somewhat obtuse 

 in male. Median frontal margin almost straight. Middle portions 

 of lateral margins produced into rounded lobes, in which the swollen 

 eyes are situated. Dorsum mth a conspicuous median bifid tubercle 

 projecting anteriad over the frontal margin. 



Pereion: Somites without supralateral projections. First somite 

 with anterolateral angles produced into bilobed processes; in the 

 male two pigmented oval areas are present on the lateral parts of the 

 dorsum, hence the specific name given by Boone. Lateral margins 

 of somites 2-5 concave, of somites 6-7 evenly rounded. Each somite 

 with carina on middorsal line; that of somite 1 divided and occupjdng 

 the length of the somite ; those of somites 2-7 single and located near 

 the posterior margins; carinae much more conspicuous in the male. 

 Epimeral plates distinct from pleura in somites 2-7, visible dorsally 

 in somites 5-7; that of somite 5, seen dorsally, quite small and oc- 

 cupying a portion of the middle of the lateral margin; those of somites 

 6 and 7 well developed and occupying the posterior halves of their 

 somites. 



