Notes on Australasian Rats. 425 with a dark dorso-central vitta winch is visible from almost any angle. Legs yellow, tarsi black. Wings clear, veins yellow basally. Calyptrse and halteres yellow. Frons slightly less than one-third of the head-width ; orbits each with three supraorbital bristles and two infra-orbitals ; cruciate interfrontals lacking ; parafacial at base of antennae wider than the rather broad third antennal segment ; longest hairs on arista distinctly longer than width of third antennal segment; palpi narrow. Thorax with about three pairs of closely placed presutural acro-stichals ; prealar very long ; sternopleurals 1 : 2. Fore tibia with one anterodorsal and one posterior bristle well apicad of middle ; basal segment of fore tarsus slender, as long as next three, second, third, and fourth segments dilated, of about equal width, fourth less than twice as long as wide ; mid-femur with two anterior, one antero-ventral, and three postero-ventral bristles basad of middle ; mid-tibia with one autero-dorsal, one postero-dorsal, and two posterior bristles ; hind femur with six antero-ventral bristles, a wide space between third and fourth, and one or two postero-ventral bristles; hind tibia with one antero-ventral, two antero-dorsal, and two postero-dorsal bristles. Costal thorn short ; last section of fourth vein not longer than preceding section. Length 11 mm. Type, Lower Ranges, North Khasi Hills, Assam, 1878 (^A. Chennell). One female. The largest species of the genus known to me. XLI. — Notes on Australasian Rats, xvkh a Selection of Lectotypes of Australasian Muridaj. By Oldfield Thomas. (Published by permission of the Trustees of the British Museum.) While determining a rat from Mt. Compass, in the neigh-bourhood of Adelaide, sent to the British Museum by Prof. Wood Jones, I have had occasion to study the various South-Australian species described by Grey and Gould, which were largely based on the material sent home by Capt, (later Sir) George Grey. These specimens have been somewhat indiscriminately labelled Mus (now to be called Rattus) fuscipes and greyi,
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