6f arts and sciences. 21 



1. EucH^TA COMMUNIS. — Cephalothorax nudus, 4-articulatus, pos- 

 tice obtusus. FemincB : antennse anticse corpore vix breviores, setis 

 paucis remotis prselongis, rectis, et aliis duabus flexis longissimis, apica- 

 libus pra;longis, postica antepenultima fere articuli longitudine. Setse 

 caudales rectae, secunda saepius corporis longitudine. Ova cserulea. 

 Maris : antennae anticae corpore paulo breviores, angulo levissime 

 flexae, setis brevibus, paucis articulum apicalem vix superantibus. Pe- 

 des postici longissimi, longe subulati. Setae caudales abdominis longi- 

 tudine. 



Long. ■^". — Hab. in mari Atlantico, lat. bor. 9° - 0°, long. occ. 

 17°-23°,et lat. aust. 0°- 13°, long. occ. 17°-32°. — Lect. dlebus 15, 

 18, 20, 24, 26, 27, 29, 30, 31 Oct., et 1, 3, 5, 9, 12 Nov., 1838 ; etiam 

 die 11 Maii, 1842. 



2. EucH^TA CONCINNA. — Ccphalothorax nudus, ellipticus, capite 

 lateraliter arcuatus, angulis posticis paulum productus et obtusus ;yem- 

 n<2 4-articulatus, maris 5-articulatus articulo postico perbrevi. Antennae 

 anticae corpore paulo breviores, fe7nincB, marisque iis E. communis fere 

 similes, seta antepenultima postica brevissima. Setae caudales abdomi- 

 ne breviores, secunda/emince fere corporis longitudine, maris abdomi- 

 nem paulo superantibus. 



Long. yV"- — Hah. in freto " Banca." — Lect. die 1 Mar., 1842. 



3. EucH^TA PUBESCENS. — FemincB : Cephalothorax pubescens, capi- 

 te lateraliter angulatus, 5-articulatus, articulo postico perbrevi, subacu- 

 te. Antennae anticae corpore paulo breviores, setas E. communi fere 

 similes, setis antepenultimis brevissimis. Pedes antici apice 5-articu- 

 lati et subelongati. Abdomen 4-articulatum, articulo prime secundum 

 longitudine duplo superante. Seta caudalis secunda ferme corporis 

 longitudine. 



Long. yy. — Hah. in mari Pacifico, in Archipel. " Paumotu." — 

 Lect. die 29 Aug., 1839. 



4. EucH^TA DiADEMA. — Femiuic : Cephalothorax pubescens, ca- 

 pite lateraliter angulatus, 4-articulatus, postice obtusus. Antennae anti- 

 cae fere corporis longitudine, setas E. communi fere similes, seta postica 

 penultima dimidium poslicae apicalis superante, setis antepenultimis 

 brevissimis. Pedes antici apice 5-7 articulati, perbreves. Abdomen 

 elongatum,-articulo prime secundum longitudine paulo superante. Se- 

 ta caudalis secunda corpore longior, nuda. 



Long. }". — Hah. in mari Pacifico, prope insulas " Kingsmill." — 

 Lect. diebus 23, 24, 25 Mar., 1841. 



