WALKER ON DIPTEEA OF AEU ISLANDS. 131 



the costa ; veins testaceous, diseal transverse vein very slightly 

 curved inward, parted by much less than its length from the border, 

 and by a little more than its length from the prsebrachial transverse ; 

 alulae whitish ; halteres testaceous. Length of the body 3 lines ; of 

 the wings 6 lines. 



Subfam. Oetalides, Haliday. 

 Gen. Lampeogaster, Macq^. 



14. Lamfrogaster \entralis, n. s. Fam. Testaceo-cinerea ; capite 

 apud oculos albo, vertice luteo, facie pallide fulva; thorace lineis 

 septem indistinctis nigricantibus j abdomine fusco maculis dorsalibus 

 canis, subtus cavo lateribus ferrugiueis; pedibus nigris, tibiis ferru- 

 gineo fasciatis ; alis limpidis basi subtestaceis, fasciis incompletis 

 guttisque fuscis apud costam nigricantibus. 



Female. Cinereous, with a testaceous tinge. Head white about the 

 eyes, vertex luteous; face pale tawny, with white grooves for the 

 antennae ; antennae tawny, small ; arista slightly plumose at the base ; 

 thorax with seven indistinct blackish lines; abdomen brown, with 

 dorsal hoary nearly triangular spots, under side marsupial- like or 

 with a pouch, ferruginous on each side ; legs black, each tibia with a 

 ferruginous band ; wings limpid, slightly testaceous at the base, with 

 brown dots and bands, the latter abbreviated hindward, blackish 

 towards the costa ; veins black, testaceous towards the base ; diseal 

 transverse vein straight, parted by about one-third of its length from 

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

 transverse; alulae cinereous; halteres testaceous. Length of the 

 body 5 lines ; of the wings 10 lines. 



Gen. Tetpeta, Meigen. 



15. Trypeta roripennis, n. s. FcRm. Fusca ; capite nigro, facie 

 alba ; antennis nigris rufo-fasciatis ; thorace vittis quatuor canis ; 

 abdominis segmentis testaceo marginatis ; pedibus nigris, tarsis hal- 

 teribusque testaceis; alis nigris, punctis plurimis albis. 



Female. Brown. Head black ; face white ; antennae black, third joint 

 red, linear, rather long, black towards the tip; arista plumose; thorax 

 with four hoary stripes; abdominal segments with testaceous hind 

 borders ; legs black, tarsi testaceous ; wings black, with very nume- 

 rous white points, a few of which are rather larger than the others ; 

 diseal transverse vein straight, parted by less than its length from the 

 border, and by more than twice its length from the praebrachial trans- 

 verse ; halteres testaceous. Length of the body 2 lines ; of the wings 

 4 lines. 



