NOTES ON SOME SQUIRRELS OF THE SCIURUS 



HIPPURU3 GROUP, WITH DESCRIPTIONS 



OF TWO NEW SPECIES 



By MARCUS WARD LYON, Jr. 

 Assistant Curator, Division of Mammals, U. S. National Museum 



Squirrels of the Spiurus hippurus group are represented in the 

 collections of the U. S. National Museum by sixteen specimens, 

 over half of them collected by Dr. W. L. Abbott in his explora- 

 tions of Malaya, among them two forms not previously described. 

 Squirrels of this group have been recorded from the Malay Penin- 

 sula, Sumatra, Java, Borneo, and the Natuna Islands. 1 They have 

 not been taken by Dr. Abbott or by other collectors, so far as I am 

 aware, on the numerous smaller islands of the Malay Archipelago. 

 Whether this is due to an actual absence of the group from those 

 islands, or to rarity, or to some peculiarity of habit, it is impossible 

 to say. 



Four forms of this group are here recognized, two of which occur 

 on the Island of Borneo. They may be known by the following 

 key and descriptions : 



.-/.—Middle line of back very different in color from rest of upperparts. 



S. grayi (Borneo) 

 A'.— Middle line of back not different in color from rest of upperparts. 

 B. — Size smaller, outer side of forearm concolor with upperparts. 



S hippurellus (Borneo) 



B' . —Size slightly larger, outer side of forearm concolor with sides of neck. 



C. — Rostrum narrow, dorsal portion of premaxillce very narrow ; 



underparts lighter S. hippurosus (Sumatra) 



O . — Rostrum not so narrow, dorsal portion of premaxillse broad ; 

 underparts darker. . .. S. hippurus (Malay Peninsula, Java) 



'Anderson, Zool. Results, Western Yunan, 1879, P- 2 4 T (Malay Peninsula, 

 Sumatra, Java). 



Bonhote, Fasc. Malay. Zool. 1, 1903, p. 19 (Malay Peninsula). 



Geoff roy, Mag. de Zool., CI. 1, No. 6, pi. 6, 1832 (Java). 



Gray, Ann. Mag. Nat. Hist.. 3d ser., xx, 1867, p. 283 (Malacca, Borneo). 



Hose, Mammals of Borneo, 1893, p. 45 (Borneo). 



Jentink, Notes Leyden Mus., v, 18S3, p. 118 (Malay Peninsula, Sumatra, 

 Borneo). 



Schlegel and Miiller, Verhandl. Nat. Gesch. Nederl. Overz. Bezitt., p. 86 

 (Sumatra, Assam, Canton, China). 



Willink, Natuurkundig Tijdschrift Nederlandsch-Indie, LXV, 1905, p. 239 

 (Sumatra, Java, Borneo, Natunas). 



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