438 Mr. O. Thomas on a 
Azara’s tenth bat—the “pardo acanelado” of the Spanish 
edition. Their forearms measure 36 to 39 millim. 
But comparing with these the series obtained at Goya by 
Mr. Perrens, it is interesting to find that the latter are, on 
the contrary, the largest of all the forms assigned to the 
common and widely-spread “ Molossus obscurus.”’ So marked 
is the difference, that the Corrientes form should clearly have 
a special name, and may be called 
Molossus obscurus currentium, subsp. n. 
Similar in all essential characters to M. obscurus as 
described by Dobson. Size larger than in other subspecies, 
and especially than in the geographically nearest M. o. crassi- 
caudatus. General colour paler than usual, near but rather 
darker than Ridgway’s “ broccoli-brown.” But someexamples 
are more rufous. Scarcely paler below. In correlation with 
the greater size, the cranial crests, especially the lambdoid 
ones, are of unusual development. 
Dimensions of the type (measured in flesh) :— 
Forearm 42 millim. (other specimens 40, 40:5, 40°6, 41, 
and 42). 
Head and body 78; tail 36 ; ear 14. 
Skull: length from gnathion to occipital surface above 
foramen magnum 18:4; interorbital breadth 5:7 ; inter- 
temporal breadth 3°6; front of canine to back of last 
molar 6°8. 
An adult female skull measures 17-9 by 12 in greatest 
breadth. 
Hab. Goya, Corrientes. 
Type. Male. B.M.no. 98.38. 4. 28. Collected Ist October, 
1896, by Mr. R. Perrens. Eleven specimens examined. 
In M.o. crassicaudatus the skull-length, measured as above, 
is about 16°5 to 17 millim., and in a series from Sao Paulo, 
representing velox, Temm., about 17°5 millim. 
8. Molossus Fostert, sp. un. 
29,49. Villa Rica and Sapucay. 
Similar to M. nasutus, but very much smaller. 
Small upper premolar minute or absent. Lower incisors 
four. 
Size intermediate between M. rufus and obscurus. Ears 
rather small, rising close together at the hinder end of a 
distinct thread-like rim running along the muzzle from the 
nose, just as in M. nasutus ; mner margin nearly straight, 
tip broadly rounded off, outer margin slightly convex ; anti- 
tragus about as high as long, nearly cireular, though less 
