_Male._ Black, with slightly gilded tomentum. Head gilded; frontalia deep black, hardly widening in front; thorax with three black stripes, an indistinct blackish line on each side of the middle stripe; abdomen tessellated with white; wings grey; veins bordered with a lurid hue, especially towards the costa; praebrachial vein forming a slightly acute angle at its flexure, near which it is much curved inward, and is thence straight to its tip; discal transverse vein slightly curved inward near its hind end, parted by a little more than half its length from the border and from the praebrachial transverse; alulae testaceous. Length of the body 5-1/2 lines; of the wings 9 lines. Subfam. MUSCIDES, _Walk._ Gen. IDIA, _Meigen_. 9. Idia xanthogaster, _Wied. Auss. Zweifl._ 11. 349. 2. Inhabits also Hindostan and Java. 10. Idia testacea, _Macq. Hist. Nat. Dipt._ 77. 246. 3. Inhabits also Mauritius. Gen. MUSCA, _Linn._ 11. Musca obtrusa, _Walk._ See p. 105. Subfam. ANTHOMYIDES, _Walk._ Gen. ARICIA, _Macq._ 12. ARICIA VICARIA, n. s. _Foem._ Fulva, subtus testacea; capite nigro, apud oculos albo; antennis testaceis; alis cinereis, apud costam luridis. _Female._ Tawny, testaceous beneath. Head black, white about the eyes; antennae testaceous; abdomen clothed with short black bristles; legs testaceous, tarsi piceous; wings grey, with a lurid tinge towards the costa; veins black, discal transverse vein nearly straight, parted by about its length from the border, and by a little more than its length from the praebrachial transverse; alulae slightly testaceous; halteres testaceous. Length of the body 3-1/2 lines; of the wings 6 lines. 13. ARICIA SQUALENS, n. s. _Foem._ Nigra, cinereo tomentosa; facie argentea; antennis testaceis; thorace vittis nigris vittisque duabus lateralibus latis testaceis; abdomine obscure testaceo; pedibus piceis; femoribus nigris; tibiis anticis testaceis; alis cinereis; apud costam subluridis; venis halteribusque testaceis. _Female._ Black, with cinereous tomentum. Face silvery white; antennae pale testaceous, third joint long, linear, extending to the epistoma; thorax with black stripes, and on each side with a broad testaceous stripe; abdomen dull testaceous; legs piceous; femora black, fore tibiae testaceous; wings grey, with a lurid tinge towards the costa; veins testaceous, discal 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 praebrachial transverse; alulae whitish; halteres testaceous. Length of the body 3 lines; of the wings 6 lines. Subfam. ORTALIDES, _Haliday_. Gen. LAMPROGASTER, _Macq._