82 WALKER ON DIPTERA OF ARU ISLANDS. 



Gen. Adraga, n. g. 



Mas. Corpus sublineare. Caput thorace non latius. Oculi connexi. 

 Antenna brevissimae j articulus tertius rotundus ; arista apicalis, gra- 

 cilis, setiformis. Thorax sutura transversa bene determinata. Scu- 

 tellum prominens, trigonum, marginatum. Abdomen thorace paullo 

 brevius, non latius. Pedes breviusculi, validi, non dilatati. AI(B 

 mediocres. 



Male. Body nearly linear, rather thick. Head not broader than the 

 thorax. Eyes connected. Antennae very short ; third joint round; 

 arista apical, long, slender, setiform. Thorax with the transverse 

 suture very distinct. Scutellum prominent, triangular, with a border. 

 Abdomen a little shorter and not broader than the thorax. Legs stout, 

 rather short, not dilated. Wings moderately broad; veins in structure 

 like those of Clitellaria. 



18. Adraga univitta, n. s. Mas. Nigra, subtilissime punctata, an- 

 tennis piceis, thorace vitta cinerea, tarsis posterioribus albis, alis 

 nigricantibus. 



Male. Coal-black, hardly shining ; antennae piceous ; thorax and abdo- 

 men very minutely punctured; thorax with a stripe of cinereous 

 tomentum; posterior tarsi white; wings blackish, veins black. 

 Length of the body 3 lines ; of the wings 5 lines. 



Gen. Obrapa, n. g. 



F(£m. Corpus breve, latum, crassum, convexum. Caput transversum, 

 thorace angustius. Antennae breves; articulus tertius rotundus; 

 arista apicalis, gracilis, setiformis. Thorax sutura transversa bene 

 determinata. Abdomen transversum, thorace paullo latius, valde bre- 

 vius. Pedes breviusculi, validi ; antici subdilatati. Alee mediocres. 



Female. Body short, broad, thick, convex. Head transverse, narrower 

 than the thorax. Antennae short ; third joint round ; arista apical, 

 slender, setiform. Thorax with the transverse suture very distinct. 

 Scutellum large, prominent, with a marginal suture. Abdomen trans- 

 verse, a little broader than the thorax, and not more than half its 

 length. Legs stout, rather short, the fore pair slightly dilated. 

 Wings moderately broad, veins rather irregular ; discal areolet large, 

 quadrilateral ; externomedial veins, subanal vein, and anal vein very 

 slight ; subanal vein and anal vein united at some distance from the 

 border. 



1.9. Obrapa perilampoides, n. s. Foem. Atra, nitens, subtilissime 

 punctata, capite glabro, antennis piceis, tarsis posterioribus albidis, 

 alis limpidis, venis albidis basi nigris, halteribus niveis. 



Female. Deep black, shining, very minutely punctured ; head smooth ; 

 antennae piceous; posterior tarsi whitish, with black tips; wings 

 limpid, veins whitish, black towards the base ; halteres snow-white. 

 Length of the body 2^ lines ; of the wings 5 lines. 



