FJBOM THE ISLAND 0¥ SALWATTY. 133 



Subfam. Obtalides, Holiday. 

 G-en. PoTiCAEA, Walk. 



7. PoTiCARA BiARCUATA. FcBOT. Nigra, capite aurato vertice rubro 

 frontalibus atris, antennis luteis, pectore abdomineque nigro-viridibus, 

 femoribus flavis apice nigris, alls nigris striga basali maculis tribus 

 costalibus striga postica exteriore maculisque duabus subapicalibus 

 albidis. 



Female. Black. Head gilded yellow, nearly as broad as the thorax ; 

 vertex deep red ; front deep black ; face broad, with an ochraceous 

 mark towards the front. Antennae luteous, not more than half the 

 length of the face ; third joint slightly tapering, full twice the length 

 of the second ; arista very delicately setulose. Thorax dull. Pectus 

 greenish black, shining. Abdomen blackish green, fusiform, much 

 narrower but hardly longer than the thorax. Femora, excepting the 

 tips, and fore coxae yellow. Wings black, in structure like those of 

 P. triarcuata; a small whitish streak near the base of the costa; 

 three triangular whitish costal spots, of which the first is very small ; 

 a whitish oblique streak beyond the middle of the hind border, and two 

 whitish triangular spots near the tip of the latter ; veins and halteres 

 black. Length of the body 5 lines; of the wings 12 lines. 



The structure of the head in this genus indicates its affinity to 

 Achias ; it is also allied to Dacus and to Lamprog aster. 



G-en. Achias, Fahr. 



8. Achias dacoides. Mas. Obscure rufa, capite flavescente dilatato 

 fasciis duabus vittisque sex nigris, antennis piceis basi fulvis, thorace 

 vittis tribus nigris scutello fulvo metathorace fascia albida, abdomine 

 piceo petiolato vitta pallidiore, pedibus nigris tarsis posticis femori- 

 busque flavis, alls cinereis vitta costali fusca, halteribus flavis apice 

 nigi'is. 



Male. Dark red. Head dingy yellowish, much dilated, broader by 

 half than the thorax ; two black bands on the vertex ; face vdth two 

 black stripes ; two oblique black stripes on each side, each of the first 

 pair forked towards the facial stripe, and thus including a small trian- 

 gular yellowish dot. Antennae piceous, tawny at the base, not extend- 

 ing to the epistoma; third joint tapering, full four times the length 

 of the second ; arista setulose. Thorax with three black stripes ; 

 scutellum tawny ; metathorax with a whitish band. Pectus partly 

 covered with cinereous tomentum. Abdomen petiolated, elliptical, 

 piceous, with a paler stripe and with cinereous tomentum, much nar- 

 rower and rather longer than the thorax. Legs black ; femora yellow, 

 black at the base ; hind tarsi yellow, black towards the tips. Wings 

 cinereous, with a brown costal stripe ; veins black, pale yellow towards 

 the base; discal transverse vein hardly bent inward, parted by one- 

 fourth of its length from the border, and by more than its length 



LllOr. PEOC. — ZOOLOaT, TOL. Till. 11 



