550 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 94 



segment has an enlarged base, and the caudal rami are longer and 

 parallel instead of divergent. 



Family SPHYRIIDAE 



PAEONODES, new genus 



Bodj' separable into cephalothorax, neck, trunk, genital segment, and 

 abdomen. Cephalothorax enlarged into a transverse ellipsoid as in 

 Paeon; neck made up of the second thoracic segment and nearly 

 straight; trunk cylindrical and made up of the third and fourth 

 thoracic segments; genital segment distinctly separated and without 

 posterior processes; abdomen also distinct and as long as the genital 

 segment, with well-defined caudal rami. 



Two pairs of segmented antennae, the usual mouth parts, and four 

 pairs of biraniose swimming legs, the rami 1-segmented. 



Remarks. — ^Wlien first viewed this genus seems to resemble Paeon 

 closely but even a cursory examination reveals that the two genera are 

 widely separated. The presence in Paeonodes of normal antennae, 

 mouth parts, and swimming legs instead of nondescript processes, the 

 distinct separation of genital segment and abdomen, and the absence 

 of posterior processes all combine to furnish a decisive separation of 

 the genera. 



Genotype. — Paeonodes exiguus, new species. 



PAEONODES EXIGUUS, new species 

 Plate 32, Figltres 187-189 



A single female with ovisacs and an attached male was taken from 

 near the eye of an unidentified fish in May 1911, locality not given. 

 These two specimens, U.S.N.M. No. 79642, are holotype female and 

 allotype male of the new species, respectively. 



Female. — Head fused with the first thoracic segment and enlarged 

 into a transverse ellipsoid twice as wide as long. The second segment 

 constitutes a neck as long as the third and fourth segments combined 

 and about the same diameter throughout. The body is made up of the 

 fused third and fourth segments, the former three times as long as the 

 latter, judged by the position of the swimming legs. The diameter 

 increases backward until it becomes twice as wide at the posterior end. 

 Tlie genital segment is spherical and half as wide as the posterior end 

 of the body, with the ovisacs attached to the center on either side. 

 The abdomen is only half as wide as the genital segment, but it is 

 nearly as long and 1-segmented. The caudal rami are about as wide 

 as long and each is tipped with a single seta. The ovisacs are cylin- 

 drical, half as long and a third as wide as the body, and the eggs are 

 minute and numerous. 



