536 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



sagittal crest; upper incisors, only two; outer and lower wall of orbit 

 wide, about 7 mm. ; bulla? not swoDen, underparts g-rayish white. 



Color. — Upper parts range from a light wood brown to a color 

 between ochraceous and tawn}^ ochraceous (type is of latter color, 

 moderately frosted). Dorsal stripe and face marks range from a light, 

 bright russet to a dark brown, similar to a dark burnt umber (latter 

 color in the type). Dorsal stripe is widest in region of shoulder and 

 gradually disappears on the rump or on lower back (as in the type). 

 Underparts light grayish, irregularly spotted in two specimens (one 

 the type), with a pinkish Iniff. Individuals may or may not be frosted, 

 type moderately frosted. 



Skull and teeth. — Temporal ridges never uniting to form a sagittal 

 crest, forming instead two parallel ridges on top of skull. Never more 

 than two upper incisors even in the ver}' young; lower outer wall of 

 orbit about 7 mm. wide, bulla? not swollen. 



Measweinents.- — See table, page 537. 



Spechnens examined. — Seven skins with skulls and two alcoholics 

 from western Borneo. 



HemarJix. — J^yctleehushorneanux is very distinct and needs no com- 

 parison with any of the preceding species. 



NYCTICEBUS BANCANUS, new species. 



Type.—AdxxM female. Skin and skull, Cat. No. 124907, U.S.N.M., 

 collected at Klabat Bay, Island of Banka, east of Sumatra, June 24, 

 1904, l)y Dr. W. L. Abbott. Original number 3432. 



Dlstrlhution. — Island of Banka. 



Diagnostic characters. — Like Nycticelms horneanus, but underparts 

 darker, bulh^ more inflated and lower outer rim of orbit narrow, 

 about 3 mm. wide. 



Color. — Type: Upper parts generally a color something between 

 Ridgway's ochraceous-buff and ochraceous with practically no frost- 

 ing; dorsal stripe something between a dark russet and tawny. Dorsal 

 stripe not of the well-defined type, disappearing in the lumbar region. 

 Face markings concolor with dorsal stripe. Underparts a mixture of 

 grayish and ochraceous-butf. 



Skull and teeth. — Skull similar to that of Nycticehus horneanus, but 

 the mastoid bullre are slightly more inflated and the outer and lower 

 walls of the orbit are narrow, about 3 to 4 mm. wide, against 6 to 8 in 

 N. horneanus. Upper incisors only two. 



Measurements. — See table, page 537. 



Sp)ecl7nens examined. — One, the type. 



Remarks. — Nycticehus hancanus is apparently a well-marked offshoot 

 of N. l>orneanns. The skin of the type and only specimen is practically 

 indistinguishable from Cat. No. 142233, U.S.N.M. , one of the paratypes 

 of JSf. horneanus^ but the narrowness of the outer and lower orbital wall 

 in JV. Inrneamis at once distinguishes the two species. 



