1922] Allen, Congo Sciuridae, Anomaluridse, Idiuridx 65 



Anomalurops beecrofti chapini, new subspecies 



Type, No. 50480, cf adult, Medje, Belgian Congo, May 6, 1910; Herbert Lang 

 and James P. Chapin. American Museum Congo Expedition. Orig. No. 861. Named 

 for James P. Chapin. 



Smaller and much lighter in color than A. beecrofti citrinus Thomas, 1 from Benito 

 River, Spanish Guinea. 



General color above (including membranes), }^ellowish gray; middle of back 

 from occiput to sacral region with an irregular broad band of ochraceous orange, 

 varied with black, the hairs individually (about 20 mm. in length) mouse-gray 

 basally, passing gradually into a broad band of dull black, followed by a subapical 

 band (5-6 mm. wide) of ochraceous orange and conspicuously tipped with black; 

 hairs of upper surface of membrane for the antero-lateral fourth of the border rigid 

 and intense black; a well-defined patch of white or buffy white at lateral base of 

 ears, indistinctly merging by a downward sweep with the white or whitish half collar 

 in front of shoulders, and the usual small tuft of partly concealed white hairs on occi- 

 put; front and sides of head dull gray or buffy gray, extending laterally to sides of 

 throat ; general color below (including membranes) ochraceous buff to base of hairs 

 (varying in some specimens to light buff or even whitish), except on the throat and a 

 broad median band thence to anal region (usually narrowing posteriorly) and the 

 inside of thighs, which parts are intense orange-rufous in high-colored specimens, 

 paler in others; basal third of tail and caudal membrane below like ventral surface, 

 above like the lower back; apical two-thirds of tail dull brown, varying in different 

 specimens from dark brown to pale fulvous brown and even cinnamon-brown; 

 upper surface of feet dull grayish with a slight buffy suffusion; soles and palms naked, 

 pale brown, as are the nose and apical two-thirds of ears. 



Collectors' measurements of type: Total length, 512 mm.; head and body, 310; 

 tail vertebrae, 202; hind foot, 59; ear, 29. 



Measurements of skull (type): Greatest (occipito-nasal) length, 54.5; condy- 

 loincisive length, 51.4; zygomatic breadth, 34.4; least interorbital breadth, 18.4; 

 breadth of brain-case, 26.3; length of upper toothrow, 11.9. 



Collectors' measurements of 10 adults (5 cf, 5 9), of which 8 are from Medje 

 and 1 each from Poko and Akenge: 



Total Length Head and Body Tail Vertebrae Hind Foot Ear 



cf 512 (501-518) 301 (278-323) 211 (195-223) 59 (56-62) 31 (29-32) 

 9 510 (475-555) 297 (277-330) 213 (198-226) 59 (58-60) 31 (29-32) 



Represented by 14 specimens (8 cf, 6 9 , all adult but 2), collected as follows: 



Medje, 12, (6 d", 6 9), March 13, April 9, 13, 27, 30, May 6, 8, September 24, 

 October 12, 1910, February 28, 1914. 



Poko, 1 (cf ), August 22, 1913. 



Akenge, 1 (tf 1 ), October 1, 1913. 



Anomalurops beecrofti chapini is geographically nearest A. bee- 

 crofti citrinus Thomas (type from " Benito River, Spanish Guinea," 

 collected by G. L. Bates), from which it differs in considerably smaller 

 size and much less intense coloration. Fortunately I am able to make 



1 Anomalurus beecrofti citrinus Thomas, 1916, Ann. Mug. Nat. Hist., (8) XVIII, August, p. 236. 

 'About a dozen specimens examined." 



