390 PERCY SLADEN TRUST EXPEDITION 



articulus 3 ; articulus 5 paulo, fere quavta parte longior quam articuli 3 et 4 simul surapti ; 

 flagellum paulo longius quam scapi articulus 5, 15-articulatuin, articulo primo ceteris 

 longiore. 



Trunci segmeuta quattuor priora margine posteriore subrecto vel leviter curvato, 

 angulis posticis rotundate obtusis ; segmenta 5 et 6 margine posteriore in medio leviter 

 incurvo ; segmentum 7 margine posteriore in medio fortiter incurvo ; anguli postici 

 segmenti 5 subrecti, segmentorum 6 et 7 acutiores. Segmentum 2 pronoto quarta parte 

 dorsi vix longiore, utrinque intra angulos laterales desinente. 



Caudae segmenta 1 — 5 post sensim majora, epimeris minimis, adpressis, inflexis. 



Telsum breve, medio leviter rotundate triangulo producto. 



Uropodes producti, longi, tertiam corporis partem longitudine paulum superantes ; 

 scapus teres, oblongus, plus duplo longior quam latior ; exopoditum elongate conoidale, 

 multo, fere duplo, longius quam scapus, apice setis brevibus instructum ; endopoditum 

 processui brevi scapi insertum, quam scapus paulo brevius, apice tamen scapum superante. 



Subunicolor e fusco violaceus. 



Long. 5 — 6 mm. Lat. 2 — 2'3 mm. 



Distrihution. Malay Peninsula. 



37. Olib^'inus pigmentatus, n. sp. 



Oculi minores, ocelli numero 1 1 . 



Antennae perlongae, corpore vix breviores. Flagellum articulo 5 scapi longius, 

 13-articulatum ; articvilus primus ceteris paulo longior. 



Frons ante marginata, linea marginalis utrinque decurrens, lobos minores amplectens. 

 Fossae antennarum permagnse, maximam partem inferiorem epistomatis occupantes. An- 

 tennulse sese fere attingentes, spatium inter fossas antennarum occupantes. Clypeus 

 magnus leviter fornicatus ; labrum magnum porrectum. Os porrectum. 



Trunci segmenta 1, 2, 3 margine posteriore leviter curvato, utrinque vix incurvo ; 

 segmentum 4 margine posteriore subrecto ; segmenta 5, 6, 7 margine posteriore in medio 

 post sensim magis incurvo; anguli posteriores segmentorum 1, 2, 3, 4 rotundate obtusi, 5 

 subrecti, 6, 7 acuti. 



Caudse segmenta 5 priora subseque longa, epimeris omnibus minutis, adpressis. 

 Segmenta 1, 2 brevia, 3, 4, 5 longiora, epimeris perparvis acutis. 



Pleopodes trachea nulla muniti. 



Telsum brevissimum, medio anguste rotundate paulum producto. 



Uropodes longi, producti, tertiam corporis partem longitudine subsequantes ; scapus 

 angustus, processu endopoditi brevi ; endopoditum gracile scapum paulum superans ; 

 exopoditum longum dimidio longius quam scapus, gracile, teres. 



Color albidus, punctis nigris minutissimis pigmentatus. 



Long. 6 mm. Lat. 2'2 mm. 

 • Distribution. Chagos Archipelago : Salomon, one specimen ; Coin, Peros, four 

 specimens. 



