3. ASILUS SUPERVENIENS, n. s. _Mas._ Cinereous, capite subaurato, mystace aurato setis paucis nigris, thorace vittis tribus latissimis nigris, abdomine fulvescenti-cinereo, pedibus rufescentibus, femoribus nigro vittatis, tarsis nigris, alis cinereis apice nigricantibus, halteribus testaceis. _Male._ Cinereous. Head slightly gilded, pale cinereous, and clothed with pale hairs behind; mystax composed of gilded bristles, above which there are a few shorter black bristles; antennae black, third joint elongate-fusiform, arista much longer than the third joint; thorax with three very broad hardly divided black stripes; abdomen with a slight fawn-coloured tinge, tip black, sexualia very small; legs reddish, femora striped above with black, tarsi black, reddish at the base; wings cinereous, blackish towards the tips; halteres testaceous. Length of the body 8 lines; of the wings 14 lines. Gen. OMMATIUS, _Illiger_. 4. Ommatius noctifer, _Walk._ See page 88. Fam. EMPIDAE, _Leach_. Gen. HYBOS, _Fabr._ 5. HYBOS DEFICIENS, n. s. _Mas._ Niger, thorace fulvo globoso macula dorsali nigra, abdomine basi fulvo, pedibus anterioribus testaceis, femoribus posticis subtus spinosis, alis cinereis apice obscurioribus, stigmate venisque nigris, halteribus testaceis, apice piceis. _Male._ Black. Thorax and pectus tawny, the former globose, with a black dorsal spot; abdomen tawny at the base; anterior legs testaceous, hind femora spinose beneath; wings grey, darker at the tips; stigma and veins black; halteres testaceous, with piceous tips. Length of the body 2 lines; of the wings 4 lines. Fam. SYRPHIDAE, _Leach_. Gen. ERISTALIS, _Latr._ 6. Eristalis resolutus, _Walk._ See p. 95. Gen. BACCHA, _Fabr._ 7. BACCHA PURPURICOLA, n. s. _Foem._ Purpureo-fulva; capite chalybeo; antennis rufis; pedibus fulvis; tibiis posticis apice tarsisque posticis basi piceis; alis nigricantibus, apud costam obscurioribus, spatio apicali subcostali cinereo; halteribus testaceis. _Female._ Tawny, tinged with purple. Head chalybeous; antennae red; legs tawny, hind tibiae piceous towards the tips, hind tarsi piceous towards the base; wings blackish, darker along the costa, cinereous towards the tips with the exception of the costa; halteres testaceous. Length of the body 5-1/2 lines; of the wings 9 lines. Fam. MUSCIDAE, _Latr._ Subfam. SARCOPHAGIDES, _Walk._ Gen. SARCOPHAGA, _Meigen_. 8. SARCOPHAGA BASALIS, n. s. _Mas._ Nigra, subaureo tomentosa; capite aurato; thorace vittis tribus nigris; abdomine albido tessellato; alis cinereis; venis lurido marginatis; alulis testaceis.