114 WALKEE ON DIPTERA OF ARU ISLANDS. 



Gen. Dacus, Fahr. 



12.9. Dacus EXPANDBNS, n. s. Fcem. Fulvus, latiusculus ; antennarum 

 articulo tertio piceo angusto linear! longissimo ; abdomine vitta tenui 

 nigricante ; alis limpidis, costa vittaque postica fuscescentibiis. 



Female. Tawny, rather broad, very slightly covered with hoary tomen- 

 tura, which forms stripes on the thorax and indistinct bands on the 

 abdomen ; third joint of the antenna? piceous, slender, linear, very 

 long ; arista bare ; abdomen with a slender blackish stripe ; wings 

 limpid, brownish along the costa, and with a short oblique brownish 

 stripe extending from the base to the interior border; veins black, 

 discal transverse vein oblique, parted by full one-fourth of its length 

 from the border, and by more than its length from the praebrachial 

 transverse ; halteres testaceous. Length of the body 4 lines ; of the 

 wings 8 lines. 



130. Dacus pectoralis, n. s. Fosm. Cinereo-niger ; capite fulvo, 

 facie guttis duabus nigris ; antennarum articulo tertio piceo angusto 

 lineari longissimo ; callis duabus humeralibus, fasciis duabus obliquis 

 pectoraUbus lateralibus, scutello tarsisque testaceis ; thoracis vittis 

 tribus abdominisque una canis ; pedibus fulvis piceo cinctis ; alis lim- 

 pidis, costa vittaque postica fuscescentibus. 



Female. Black, slightly covered with cinereous tomentum. Head 

 tawny, with two small black dots on the face; third joint of the 

 antennae piceous, slender, linear, very long, arista bare ; thorax with 

 three indistinct hoary stripes ; humeral calli, an oblique band on each 

 side of the pectus, scutellum and tarsi, testaceous; abdomen with 

 one hoary stripe ; legs tawny, with diffuse piceous bands ; wings 

 limpid, brownish along the costa, and with a short oblique brownish 

 stripe, extending from the base to the interior border ; veins black ; 

 discal transverse vein parted by less than one-fourth of its length 

 from the border, and by a little more than its length from the prae- 

 brachial transverse ; halteres testaceous. Length of the body 3f lines ; 

 of the wings 71 lines. 



131. Dacus lattfascia, n. s. Fosm. Niger; capite postice et apud 

 oculos albido ; antennarum articulo tertio vix longo ; thoracis fascia, 

 metathorace pectorisque fasciis duabus obliquis canis ; abdomine 

 cyaneo ; femoribus albidis apice nigris ; alis albo-limpidis, costa atra, 

 fasciis duabus latissimis nigris ; halteribus testaceis. 



Female. Black. Head whitish behind and about the eyes ; third joint 

 of the antennae linear, round at the tip, hardly long, arista plumose ; 

 thorax with a band on the hind border of the scutum ; metathorax 

 and an oblique band on each side of the pectus hoary; abdomen 

 blue; coxae and femora whitish, the latter with black tips; wings 

 limpid white, deep black along the costa, and with two very broad 

 black bauds ; veins black ; discal transverse vein very oblique, parted 



