On a Collection of Bats from Paraguay. 435 
LIV.—On a Collection of Bats from Paraguay. 
By Ouprirtp THomas. 
Tue British Museum has recently received from Mr. W. 
Foster a collection of bats made by him in Central Paraguay, 
a region of particular interest and importance to all mam- 
malogists on account of the large number of species described 
by Azara from there, species many of which have been 
hitherto by no means satisfactorily identified. I have there- 
fore worked out Mr. Foster’s beautifully-prepared collection 
with unusual pleasure, and have been rewarded by finding in 
it authentic topotypical examples of eight of Azara’s thirteen 
bats and also two species new to science. The latter are both 
members of the genus Molossus,a group in which Mr. Foster 
has been extraordinarily successful, as he has sent home 
examples of no less than six species of it, a very surprising 
proportion out of only nineteen species altogether. 
I have also taken the opportunity of comparing with the 
Paraguayan bats the specimens sent by the late Mr. R. 
Perrens from Goya, on the Parana, further south in Cor- 
rientes. These, for want of Paraguayan material, I have 
hitherto had to treat provisionally as representing Azara’s 
species, but I now find that in two cases at least they differ 
sufficiently to require separation. 
1. Vespertilio dorianus, Dobs. 
3g. Villa Rica. 16th February, 1901. 
36,49. Sapucay. February, March, and May. 
Forearms 37 to 39 millim. 
2. Lasiurus borealis bonariensis, Less. & Garn.* 
S, 2. 24th February and 10th March. 
The Red Bat was not observed by Azara, his Chauve-souris 
septiéme, the basis of Vespertilio villosissimus, Geoff., being 
clearly a southern representative of the Grey Bat (Lasiurus 
cinereus, P. de Beauv.). 
3. Dasypterus ega argentinus, Thos. 
Dasypterus ega argentinus, Thos. Ann. & Mag. N. H. (7) viii. p. 247- 
(1901). 
9. Sapucay. 18th March. “ Caught flying.” 
4, Myotis albescens, Geoff. 
Chauve-souris douziéme, Azara; the basis of Vespertilio albescens, 
Geoff. 
2. Tacuaral. 12th November, 1900. 
* Cf, Allen, P. Biol. Soc. Wash. xiii. p. 165 (1900). 
31% 
