WALKEE ON DIPTERA OF AKU ISLANDS. 121 



(lots containing pale marks, some of them confluent and forming a 

 middle band ; discal transverse vein straight, enclosed in a pale streak, 

 parted by much less than its length from the border and by much 

 more than its length from the prabrachial transverse; halteres 

 whitish. Length of the body 1^ hne ; of the wings 3 lines. 



Subfam. Achiides, Walk. 

 Gren. AcHiAS, Fahr. 



147. AcHiAS LONGiviDENS, n. s. Mus et FcBm. Viridi-cinerea ; capite 

 testaceo fasciis duabus vittisque tribus anticis nigris ; antennis nigris ; 

 thorace vittis quatuor purpureo-nigris, pectore ferrugineo ; abdomiue 

 viridi-fulvo ; pedibus piceis ; alis limpidis, costa lurido-nigricante, vena 

 transversa discali fusco nebulosa ; halteribus testaceis apice nigris. 

 Mas. Oculis longissime petiolatis, scutello viridi, femoribus basi fulvis. 

 Fcem, Oculis subpetiolatis, scutello nigro-purpureo. 



Male and Female. Greenish cinereous. Head with two black bands on 

 the vertex and w ith four black stripes in front ; antennae black, third 

 joint linear, very long, arista plumose ; thorax with four purplish black 

 stripes, middle pair abbreviated hind ward and having behind them 

 a spot of the same hue, lateral pair interrupted ; pectus ferruginous ; 

 abdomen tawny, with bright green reflections, testaceous beneath; 

 legs piceous ; wings limpid, blackish, and with a lurid tinge along the 

 costa, whence a short oblique blackish streak proceeds by the prae- 

 brachial transverse vein ; discal transverse vein clouded with brown, 

 hardly curved, parted by less than one-third of its length from the 

 border, and by much more than its length from the prsebrachial 

 transverse, which is very oblique; halteres testaceous, with black 

 tips. Male. Head with the fore black band interrupted ; eyes with 

 very long petioles, the latter about three-fourths of the length of the 

 body ; scutellum green ; femora tawny towards the base. Female. 

 Eyes with short petioles, extending a little beyond the sides of the 

 thorax ; scutellum blackish purple. Length of the body 5-6 lines ; 

 of the wings 12-13 lines. 



148. AcHiAS LATiviDENS, n. s. FcsM. Viridi-ciuerea ; capite testaceo, 

 vittis tribus anticis nigris, oculis subpetiolatis ; antennis nigris ; thorace 

 vittis quatuor purpureo-nigris, scutello cyaneo basi viridi, pectore fulvo ; 

 abdomine viridi-fulvo; pedibus nigris, femoribus basi luteis, tibiis 

 luteo fasciatis; alis subcinereis, vitta costali nigricante iuterrupta 

 lurida strigata, vena transversa discali fusco nebulosa ; halteribus tes- 

 taceis apice nigris. 



Female. Greenish cinereous. Head testaceous, with three black stripes 

 on the face ; eyes very slightly petiolat^d ; antennae black ; thorax 

 with four purplish black stripes; scutellum blue, green at the base; 

 pectus tawny; abdomen tawny, with bright green reflections; legs 

 black ; femora luteous towards the base ; tibiae with indistinct luteous 



