1917.] 



Allen, Lang and Chapin, Bats from the Belgian Congo. 



449 



Upperparts hair-brown, the hairs darker on basal half; a conspicuous tuft of 

 white hairs on the shoulders; underparts similar to back but paler; membranes dark 

 brown; limb bones pale brown on both surfaces; wing membranes attached to the 

 whole length of basal joint of outer toe; no postcalcaneal lobe. Ears small, yellowish 

 brown; tragus short, broad, straight on inner border, convex on outer border, 

 expanded at middle. Tail wholly included in the interfemoral membrane. 



Represented by 5 specimens, the type and 3 topotypes (2 of them in alcohol) from 

 Medje, the other from Avakubi, collected Feb. 21, 1914. 



Collectors' measurements of type: Total length, 82 mm.; head and body, 42; 

 tail, 40; foot, 8; ear, 9. 



Forearm, type (from skin), 36.8; third metacarpal, 35.8; tibia, 26.8; foot, 7; 

 ear, 5X6; tragus, 3 X 1. The forearm length in 2 alcoholic topotypes is, 9 35.8, 

 9 35.3; the Avakubi specimen, 38.8. 



Skull (type), total length, 11.3; zygomatic breadth, 8.2; breadth of braincase, 

 7.3; interorbital breadth, 3.9; maxillar breadth, 5.1; breadth at base of canines, 3.6; 

 upper toothrow (with canine), 3.6; length of mandible, 7.9; height at coronoid, 2.5; 

 lower toothrow, 3.9. Skull short and very broad, the braincase greatly expanded. 

 Inner incisor large, with the secondary column about one fourth lower than the main 

 cusp; outer incisor inserted posterior to the inner one, minute, about one third of the 

 height of the inner, and wedged in between inner incisor and canine. The single 

 upper premolar is approximately the size of m 3 , and quite similar to it in form. 



The pure white shoulder tuft is a conspicuous feature in the type 

 and topotypes; it is present in the Avakubi specimen, but only the tips of 

 the hairs are white (yellowish white instead of pure white). The collectors' 

 measurements and the forearm are somewhat larger than in the type, but 

 the skull measurements are practically the same in all the specimens. 



46. Glauconycteris alboguttatus sp. now 



Text Fig. 7, B. 



Type, No. 49317 (and only specimen) adult female in alcohol, Medje, March 14, 

 1914; Herbert Lang and James P. Chapin. American Museum Congo Expedition. 

 Orig. No. 2351. 



Upperparts seal brown; underparts slightly paler. A patch of lengthened pure 

 white hairs on each shoulder at base of humerus, about 8 mm. long by 5 mm. in 

 width, separated for about 10 mm. by dark fur from a second patch of white hairs of 

 similar extent but the area longer and narrower. They are symmetrical on both 

 shoulders and conspicuous when the fur is floated out in clear alcohol. Muzzle, 

 chin and sides of face nearly naked and whitish. Propatagium and outer border of 

 wing whitish; forearm and phalangeal bones light brown above and nearly white 

 below. Ears blackish externally, whitish internally. Membranes and feet blackish 

 brown, interfemoral lighter below than above. 



