Collection of Bats from Paraguay. 439 
exactly so than in M. obscurus, owing to the antero-superior 
edge being flattened. Tragus minute, linear. A distinct 
gular sac in the male. 
Fur fine and silky; hairs of back about 5 to 6 millim. in 
length. Distribution of fur much as in MM. rufus, but with 
rather more hair on the distal part of the forearm and on the 
proximal part of the fourth finger. General colour above 
dark glossy chocolate-brown, varying considerably in tone ; 
the bases of the hairs light, but not for so great an extent as 
in M. obscurus. Under surface also brown, but without 
gloss. 
Skull distinctly of the M/. nasutus pattern, high, swollen, and 
bulbous in the brain-case and narrowed in the face. Median 
crest present but not high, and not running back to meet the 
lambdoid ridges posteriorly, there being a small triangular 
space on the crown quite smooth and unridged, even in the 
oldest specimens seen. Palate deeply arched between the 
teeth, as in M. nasutus. Chin strongly developed, projecting 
downward. 
Upper incisors well thrown forward, more so than in 
M. obscurus. Anterior premolar, when present, exceedingly 
minute, smaller even than the minute outer lower incisors; 
altogether absent in three specimens out of six. Lower 
incisors four. Anterior lower premolar about half the height 
of the second, in the tooth-row, not crushed. 
Dimensions of the type, measured in the flesh :— 
Forearm 48:5 millim. (other specimens: ¢, 47°53; 2, 47°5, 
48, 48°5, 49). 
Head and body 76; tail 54; spread 354. 
Skull: greatest length 18°5; basal length 15; greatest 
breadth 11°38 ; interorbital breadth 6:2 ; intertemporal breadth 
3°7 ; front of canine to back of m* 6:8. 
Hab. of type. Villa Rica. 
Type. Male. B.M. no. 1. 8. 1. 17. Collected 26th 
February, 1901. 
This distinct species is, with its larger ally M. nasutus, 
interesting from its annectant nature, having the general 
characters of the Molossus rufus and ovbscurus group, with a 
wholly different dental formula. The variation in the 
presence or absence of the small upper premolar is especially 
noticeable, three out of the six specimens having the tooth 
and three not; the same variation is to be observed in 
M. nasutus, in which of the two Museum specimens one has 
the tooth and the other has not. 
