70. ERISTALIS RESOLUTUS, n. s. _Mas et Foem._ Niger, capite antice albo, thorace vittis duabus fasciaque pectorisque disco cinereis, scutello fulvo, abdomine fasciis interruptis aeneo-viridibus, tibiis basi fulvescentibus, alis fuscis (mas) aut obscure fuscis (foem.) basi cinereis, halteribus testaceis. _Male and Female._ Black. Head shining, with white tomentum beneath and on each side of the face; third joint of the antennae piceous, arista simple; thorax with two cinereous stripes and with one cinereous band, somewhat chalybeous towards the scutellum, which is tawny; the band continued on each side of the pectus, whose disk is cinereous; abdomen with an interrupted aeneous-green band on the second segment, third and fourth segments aeneous-green, each with three large black spots; tibia somewhat tawny towards the base; wings brown (male) or dark brown (female), cinereous towards the base; halteres testaceous. Length of the body 6 lines; of the wings 10 lines. 71. ERISTALIS CONDUCTUS, n. s. _Foem._ Niger, faciei lateribus albis, antennis, scutello, abdominis fasciis pedibusque testaceis, thorace antico albido, alis subcinereis apice obscurioribus. _Female_. Black. Head shining, with white tomentum behind, beneath and on each side of the face; antennae, scutellum, and legs testaceous, arista simple; thorax whitish in front, the whitish part continued in a short band on each side of the pectus; abdomen testaceous at the base and beneath, and with three testaceous bands; hind tibiae with black tips; wings slightly greyish, darker towards the tips, cubital vein much less bent than usual; halteres testaceous. Length of the body 3-1/2 lines; of the wings 6 lines. 72. ERISTALIS SUAVISSIMUS, n. s. _Foem._ Fulvus, capite testaceo vertice nigro, thorace vittis quinque testaceis, abdomine nigro maculis sex lutescentibus, segmentorum marginibus posticis aeneis, pedibus nigris testaceo fasciatis, alis sublimpidis punctis duobus costalibus nigris. _Female_. Tawny. Head with testaceous tomentum, vertex black, shining; antennae testaceous, arista simple; thorax with five testaceous stripes; pectus with two oblique testaceous bands on each side; abdomen black, with six somewhat luteous spots, the basal pair larger and darker than the middle pair, which are larger than the hind pair, apical segment with two testaceous points, hind borders of the segments aeneous above, testaceous beneath; legs black, tibiae at the base and tarsi testaceous; wings nearly limpid, costa with two black points; halteres testaceous. Length of the body 5-1/2 lines; of the wings 10 lines. 73. ERISTALIS MUSCOIDES, n. s. _Mas._ Cyaneo-viridis subchalybeus, capitis callo antennisque fulvis, faciei lateribus albo tomentosis, thorace subvittato, abdomine nigro maculis aeneo-viridibus, pedibus nigris, alis subcinereis, halteribus albis.