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, 



