WALKEE ON DIPTEBA OF ARU ISLANDS. 119 



duabus apiceque nigro-cinereis, fasciis tribus satis nigricantibus ; hal- 

 teribus albis. Mas. Vertice luteo postice nigro, femoribus apice 

 testaceis, alarum fasciis subconnexis. Fcem. Vertice nigro, tibiis 

 nigris, posticis basi testaceis. 

 Male and Female. Blackish green. Head testaceous; antennae tes- 

 taceous, third joint short, conical ; arista plumose ; abdomen deep 

 black ; legs testaceous ; femora black ; wings limpid white, with three 

 broad blackish stripes, the second emitting a branch from its outer 

 side to the costa, a streak connected with the outer side of the third 

 band, and the tips blackish cinereous; discal transverse vein straight, 

 parted by much less than its length from the border, and by a little 

 more than its length from the prsebrachial transverse ; halteres white. 

 Male. Vertex luteous, black hindward ; femora with testaceous tips; 

 bands of the wings partly connected. Female. Vertex black ; tibiae 

 black, the hind pair testaceous towards the base. Length of the 

 body 1^-2 lines ; of the wings 3-4 lines. 



Gren. Tetpeta, Meigen. 



142. Trypeta multistriga, n. s. Fcem. Testacea; thorace pecto- 

 reque nigro-strigatis ; abdomine maculis quatuor lateralibus anteri- 

 oribus fascia lata apiceque nigris ; femoribus posterioribus nigro 

 vittatis ; alis nigricantibus basi marginal! maculis guttisque albis. 



Female. Testaceous. Third joint of the antennae short, conical; arista 

 plumose ; thorax with black bristles on each side, with eight black 

 streaks, four in front, of which the middle pair are very short, four 

 hindward, the middle pair short, the outer pair connected in front of 

 the scutellum, two lateral black streaks ; pectus with a black inter- 

 rupted streak on each side; disk also black; abdomen with two 

 transverse black spots on each side towards the base, and with a 

 broad black band ; oviduct black, flat, lanceolate, obtuse at the tip ; 

 posterior femora striped with black ; wings blackish, limpid for a 

 space from the base along the costa and along the hind border, and 

 with twelve white marks of various size, four discal, eight marginal ; 

 discal transverse vein nearly straight, parted by one-fourth of its 

 length from the border, and by about its length from the praebrachial 

 transverse. Length of the body 3^ lines ; of the wings 6 lines. 



143. Trypeta dorsigutta, n. s. Mas. Atra; capite piceo vitta tes- 

 tacea, subtus albo ; antennis testaceis ; thorace cinereo punctis late- 

 ralibus albis, pectore albido ; abdominis segmentis testaceo marginatis ; 

 tibiis albido fasciatis, tarsis albidis ; alis albo-limpidis, strigis basalibus 

 fasciisque duabus latis nigricantibus, prima antice furcata ; halteribus 

 albis. 



Male. Deep black. Head piceous, with cinereous tomentum, white 

 behind and beneath, a testaceous stripe on the vertex ; antennae tes- 

 taceous, black at the base, third joint conical, white at the base. 



