774 M15. OLDFIELD THOMAS ON [NoV. 13, 



III the skull, the bull.'w of lesueuri are deeidedly sin;i,ller thiui in 

 (jrayi — a, dift'erence already noted in the ' Catalogue of Mai'supials.' 



Gould's Hypsiprymniis (jrayi was described from the Swan 

 llivei- ; and this name will thei'efore stand for the continental 

 foi'm. Its type is in the Museum, B.M. No. 41.1157. 



44. Lagostrophus fasciaxus Per. & Les. 



Three males ; five females. 



In 1807 Perouand Lesueuv described the Banded Wallaby from 

 specimens obtained on this very island ; so tliat Mr. Shortridge's 

 examples are absolute topotypes, and as such of vei'y great interest, 

 no specimens having been again obtained from the islands until 

 quite recently. In 1900, however, the British Museum received 

 from the Perth Museum two skins fi-om Dori'e Island ; but these 

 were put away without any special comparison being made of 

 them with the mainland form. Indeed, at that date, before the 

 Balston Exploration, no specimens well -enough collected to form 

 the basis of a compai'ison were available in this country. 



Now, howevei', that the Balston seiies contains sets fi-oin both 

 localities, I am able to state that the two forms — the one from the 

 islands about lat. 25° S., and the other from the Perth and Avon 

 regions of the mainland, about lat. 32° S. — are quite definably 

 different. The latter would bear the name of L. fasciatus albipilis 

 (lould, whose co-types are nos. 44.9.30.1 & 2 of the British 

 Museum collection. 



As the pi-esent specimens show, true L. fasciaUis is a rather 

 shorter-tailed animal than albipilis; the fur is shorter, the 

 general colour is paler, the ears are both shorter and paler-coloured 

 than in the allied form, the long white-riuged piles of the coat are 

 less prominent and numerous, and the bristle-hairs of the toes 

 only cover the base of the claws, while in albipilis they considerably 

 sui'pass the latter ; the claws are also longer in fasciatus, sur- 

 passing the tip of the toes by from 2 to 5 mm. more than is the 

 case in albijnlis. 



The following are the measui'ements of a pair of each subsj)ecies, 

 taken in the flesh by Mr. Sliortridge : — 



L. fasclatns fasciatus. — Bernier Island, 



Head and body. Tail. Hind foot. Ear. 



mm. mm. mm. mm. 



cT 593 400 330 106 48 



5 400 355 110 51 



L. fasciatus albipilis. — Avon District. 



J 410 405 112 62 



5 400 390 110 60 



I can find no tangible difference between the Dorre and Bernier 

 Island examples of Z./«scirtiits. 



