30 CHIROPTERA. 
and the second subtriangular in form. The use of this curious arrangement is quite 
unknown. The muzzle is not produced beyond the lower lip; the eyes are very large, 
the ears short and broad, the forehead deeply concave, and the calcanea greatly elon- 
gated. Another peculiarity is the colour of the fur and membranes, which is pure 
white, an extremely rare tint in the general colouring of the Mammals of tropical or 
even of temperate latitudes. 
Besides D. albus (which has a forearm of about 2 inches) Professor Peters has 
described D. scutatus, a smaller species, with a differently formed tail-pouch, from 
South America. 
1. Diclidurus albus. 
Diclidurus albus, Max. zu Wied, Isis, 1819,p. 1680 (descr. orig.)'; Beitr. Nat. Bras.ii.p.242°; Abbild. 
t. xvi.°; Dobson, Cat. Chir. Brit. Mus. p. 891, t. xx. fig. 7°. 
Diclidurus freyreissii, Max. zu Wied, Abbild. Nat. Bras. t. xvi. text’; Gray, Zool. Voy. ‘ Sulphur,’ 
p- 25, t. vill. figs. 1, la’. 
Hab. Guatemata (Sarg, Mus. Berol.3); Nicaragua, Pueblo Nuevo (Belcher, Mus. 
Brit.4)—Brazi}. 
The first description of this very curious Bat was sent by Prince Wied to the ‘ Isis’ 
under the name of D. freyreissii, which the editor, Professor Oken, changed on his 
own responsibility to D. albus. The Prince observes that he would have wished to 
return to the original designation, but by an oversight D. albus had been printed 
on the plate in the ‘ Abbildungen,’ and he therefore thought it best to retain that 
name. 
Little is known of this species. First discovered in Brazil, its range extends to Nica- 
ragua, where a specimen, now in the British Museum, was captured by Mr. Barclay, 
botanist to Sir E. Belcher’s expedition—and to Guatemala, whence an example has been 
sent by Herr Sarg, probably from the neighbourhood of Coban, to the Berlin Museum. 
Prince Wied’s original example was found concealed between the leaf-stems of a cocoa- 
nut-palm near the mouth of the Rio Pardo. 
4. MOLOSSUS. 
Molossus, Et. Geoffroy, Ann. du Mus. vi. p. 154 (1805). 
Dysopes, Illiger, Prod. Syst. Mamm. &c. p. 122 (1811). 
This and the next genus belong to the group Molossi of Professor Peters and Mr. 
Dobson, and are distinguished by their large ears (often united in front), their single 
pair of upper incisors, their swollen upper lips, and their thickened tails, on the basal 
part of which the interfemoral membrane works backwards and forwards like a sheath. 
