

GAMMARIDEA. 957 



short transverse joints, setae many and as long as diameter of joints, 

 appendage very small and short; second pair but little longer than 

 base of first, flagellum but little longer than half the base. Ante- 

 rior feet quite small, hand subovate, hirsute below, carpus not 

 shorter. Feet of second pair very stout, hand large, subovate, more 

 arcuate below and densely furnished with long slender hairs, palm 

 not excavate nor limited. Setae of ten posterior pairs short, about 

 half as long as width of fifth joint, rather numerous. The three 

 pairs of caudal stylets subequal. 

 Female ; — Hands all small, second pair a little the larger, subovate, 

 below hirsute, carpus hardly oblong, third joint rectangulate below. 



Plate 65, fig. 10 a, male, enlarged; b, part of flagellum of superior 

 antennae; c, part of mandibular palpus; d, part of leg of fourth pair; 

 e, hand of second pair of female, much enlarged; e' 9 same, magnified 

 to correspond with the male, Hg. a. 



Rio Janeiro, Brazil. 



Length, four lines. Seventh pair of legs not shorter than sixth. 



3. Antennae lmce breviores. 

 Gammarus PTJGETTENSIS. 



Epimeras rnagnce, 5tce 4:tis multo breviores. tegmentum abdominis iium 

 dorso acutum. Antennae \mm 2dis multo breviores et tenuiores, arti- 

 cido basis 2do breviore quam lmus, flagello fere 20-articulato, nudius- 

 cido, appendice brevi, 5—Q-articulatd ; 2dw crassae, dimidio corporis 

 breviores, basi longo, fere nudo, articulis 2 ultimis subwquis, flagello 

 paulo longiore quam articulus precedens, ferme 10-articulato, articulis 

 non oblongis. Pedes 4 antici majusculi, manibus subazquis, latis, 

 infra hirsutiusculis, apice oblique truncatis, palmd parce excavatd. 

 Pedes 4 postici sub&qui, setis brevibus, paucis. Styli caudales postici 

 pradongi, ramo externo crasse styliformi, brevissime spinigeri, altero 

 tenuiore, piloso. 



Epimerals large, fifth much shorter than fourth. Fourth segment of 

 abdomen acute above. Superior antennae much shorter and more 

 slender than inferior, second joint of base shorter than first, flagel- 



240 





