l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



Genera! characters. — Similar to A. palliata palliata. but general 

 color purer black, less suffused with brownish or rufous, especially 

 on flanks, rump, and posterior part of back ; pelag'e of forehead, 

 anterior part of cheeks and chin inclined backward, and that of upper 

 side of neck directed forward, forming a ruff about face as in A. p. 

 palliata; skull with broad braincase and narrow premolars. Differ- 

 ing" from A. coibensis in decidedly larger size, and from A. p. mcxi- 

 cana in much darker body color as well as larg-er size. 



Color. — Upper parts varying from pure black to black finely and 

 usually rather inconspicuously mixed with buff over most of dorsum, 

 leaving head and rump pure black ; under parts in general thinly 

 haired, black or dark brownish, becoming lighter through varying 

 shades from burnt umber of Ridgway to brownish ochraceous on 

 the long hairs overhanging lower part of sides ; chin, arms, legs 

 and tail pure glossy black. 



Skull. — Size and general form similar to that of A. p. palliata, but 

 braincase broader posteriorly ; frontal profile in male rising more 

 abruptly from rostrum ; zygomata usually more squarely spreading 

 posteriorly, the superior border of squamosal root more strongly 

 curved inward over auditory meatus ; supraoccipital protuberance 

 stouter, more projecting; interpterygoid fossa broader; audital bulla? 

 flatter; premolars narrower. Skull differing from those of A. coi- 

 bensis and A. p. mexicana in decidedly larger size. 



Measurements. — Type: Total length, 1,272 millimeters; tail verte- 

 brae, 715 ; hind foot, 143. An adult male topotype ; 1,267; 685; 142. 

 Average of 5 adult female topotypes: 1,262 (1,123-1,552): 657 

 (603-710); 140 (135-142). Skull (type): Greatest length, 123.5; 

 condylobasal length, 103.7; zygomatic breadth, 87.2; length of nasals, 

 21.8; anterior width of nasals, 10.5; width of nasals at median con- 

 striction, 8; interorbital breadth, 12.2 ; palatal length, 46.8; maxillary 

 toothrow, 29.4 ; width of crown of third upper premolar, j.j ; antero- 

 posterior extent of supraoccipital protuberance (measured from 

 lambdoid suture) 14. 1. 



Remarks. — Mycetes palliatus Gray was described and figured from 

 specimens supposed to be from Caracas, Venezuela, and that place has 

 been republished as the type locality of the species in several recent 

 lists. Mr. Sclater 1 and Mr. Alston, 2 however, have shown that the 

 specimens really came from the shores and islands of Lake Nic- 

 aragua. Comparison of series of specimens from various localities 



1 Proc. Z06I. Soc. Lond., 1872, p. 7. 



2 Biologia Ccntrali-Americana, Mammalia, p. 5, 1879. 



