NO. 1 552. NO TES ox MA LA } A X FOB C VPIXES—L YON. 583 



thiofi has been shifted backward in Thecurus and is found on the first 

 dorsal vertebra; the very long- neural spine on the first dorsal of 

 Acanthion occurs on the second dorsal in Theciwus. The lumbar 

 vertebrjB (Plate LVII, fig. 10) in Thecurus have large rectangular lateral 

 processes, directed anteriorly much as in Acanthion^ but the processes 

 are rather more slender. The lirst and one-half of the second sacral 

 vertebra serve for the attachment of the ilia. The presternum is 

 relatively shorter in Thecurus than in Acanthwn and the expanded 

 part is relativel}' wider. The limb bones are relatively short and 

 heavy, proportioned as they are in Acanthion^ but the anteriorly pro- 

 jecting "knee" at about the middle of the tibia is more pronounced. 

 The scapula is somewhat wider, in proportion to size, in lliecurus 

 than in AcmitJuon. It is almost identical in size and shape to the 

 scapula of Atlierurus. 



THECURUS SUMATR.1E, new species. 



Type.—^km and skull of adult male, Cat. No. 143432, U.S.N.M., 

 collected at Aru Ba}^, east coast of Sumatra, January 17, 1906, by Dr. 

 W. L. Al)bott. Original No. 1637. 



Distrlhution. — Known only from the vicinity of Aru Ba}^, Sumatra. 



Diagnostic characters. — The same as given for the genus above. 



Color. — General color on top of head and anterior half of back, 

 much like a dark dral) of Ridgway, specked, especially on top of neck 

 and toward the sides with the dirty white tips of the spines. Sides of 

 head and neck and underparts drab, conspicuously specked with the 

 dirty white tips of the spines. Under side of neck dirty white or 

 cream-buff, crossed by a drab collar 25 to 30 mm. wide. The feet and 

 legs are darkened almost to liidgway's seal brown. The quills are 

 blackish, with dirty whitish tips of 20 to 25 mm. Spines on the lower 

 back blackish with short (about 5 mm.) light-colored tips. 



Skull and teeth. — The characters of the skull have already been 

 described. The skulls as a whole show a great deal of individual 

 variation in respect to size, comparative width of skull, and length of 

 nasals. (See table of measurements, p. 593.) The teeth show equal 

 variation in size, No. 143431 having the length of upper toothrow 

 19.5 mm. and No. 143435, with teeth worn to the same extent, 17.2 

 mm. AVear produces very striking effects on the teeth; reentrant 

 angles seen in the young and in the 3"oung adults are entirely lost in 

 old individuals, and judging by the teeth alone one might easily con- 

 sider joung and aged adults to belong to different genera. 



Measurements. — External measurements. (See table, p. 593.) Cra- 

 nial measurements of the type: Basal length, 92.3 mm. ; basilar length, 

 85; condylo-basal length, 99.4; greatest length, 108; upper length, 

 103.7; palatal length, 51.3; zygomatic breadth, 56; distance between 

 outer margins of external auditory meatus, 42.8; interorbital constric- 



