SUPPLEMENT. 
In the first parts of this volume I adopted, owing to an unfortunate misunderstanding, 
a different northern limit of the Central-American subregion from that selected by 
the Editors of the work. Instead of taking the valleys of the Rio Grande and Gila as a 
boundary, I drew the line at the 25th parallel of north latitude, thus rejecting many 
Nearctic species which extend into the Northern-Mexican States of Sonora, Chihuahua, 
&c. Although I am still of opinion that the latter is the most natural limit of the 
subregion, it is evident that uniformity with the rest of the work demands the adoption 
of the more northern boundary; I therefore accepted it in the rest of the volume; and 
I now notice the few species of Bats and Insectivores which were omitted in the early 
parts. I have also added what little further information has reached me while going 
through the press, and have corrected one or two of the graver errors into which I 
have fallen, thus bringing up the subject, to the best of my power, to the date of the 
completion of publication. 
The additional genera and species are marked thus “(N.),” and are duly incorporated 
in the tables which will be given in the Introduction. 
VESPERUGO (p. 19). 
Under this heading I should have noticed Scotophilus miradorensis, a provisional 
name proposed by Dr. H. Allen for a Bat of that genus, of which a single specimen 
was sent by Dr. Sartorius from Mirador, Vera Cruz, to the Smithsonian Institution 7. 
Along with the other Bats described by Dr. Allen at the same time, I omitted V. mira- 
dorensis in hopes of being able to obtain the type for examination ; but in this I have 
been disappointed (cf: infra, p. 205, sub voce VESPERTILIO). 
[Vesperugo parvulus (p. 21). 
A specimen of this species has been obtained by Mr. A. Forrer in the Tres Marias 
Islands, the locality from which Mr. Allen’s types were procured.—O. T.] 
* [This Supplement was left by Mr. Alston in an almost complete state at the time of his death on the 7th 
of March 1881. The few additional specimens that have since come into our hands have been determined by 
Mr. Oldfield Thomas, who has in certain cases added a few notes respecting them. These will be found in 
brackets in their proper places with Mr. Thomas’s initials attached to them.—LEbp. | 
+ Proc. Acad. Philad. 1866, p. 287 (deser. orig.). | 
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