MAMMALIA — RODENTIA, 
57 
is not to be met with. Gray describes also a D. alhida ; whitish-grey, 
nearly uniform ; the hair of the back elongated, white at the base : from 
St. Vincents, in the West Indies. Size of a Guinea-pig, Cavia cdbaya. 
This species (?) is quite unknown to me. 
Lund has, in the often quoted Kopenh. Denkschr. p. 286, also drawn 
attention to the difference between the two citron yellow Agutis. I am 
of his opinion, that Markgraf’s Aguti is the one defined by Desmarest 
and most authors as D. aguti. Lund, on the other hand, would totally 
separate the South Brazilian species from that of Paraguay (the D. Azarce, 
Lichtenst.), and calls the former D. caudata. He distinguishes the two 
by this, that in the D. Azarce the rump is of the same colour with the 
rest of the body (in the D. caudata, pure grey) ; the size is smaller, and 
the tail shorter. I can, however, affirm, from seeing the numerou 
South Brazilian specimens in the Vienna collection, that the colour o 
the rump in them here and there also falls into grey ; no difference o 
size exists ; and therefore the specific distinction is inadmissable. 
The reporter regrets, that from want of room, he can only 
epitomise the extensive and valuable communications of Liind 
in the Kopenh. Denksch. of 1841. 
Lund distinguishes two Cavioe ; a larger darker one, with white beUy, 
which he calls Cavia aperea, and considers identical with Lichtenstein’s 
C. obscura and C. leucopyga, which is correct. To another smaller one, 
with shining fur passing into reddish, and a yellow-grey belly, he gives 
the name of C. rufescens. This is, as the reporter adds, the same with 
Wagler’s C.fulgida, Lund distinguishes a smaller species of Cerodon 
rupestris, which he names C. saxatilis, but merely characterizes it by 
the configuration of the skull. Ccelogenys fulvus and Juscue belong to 
one species ; the difference of the skull in regard to smoothness or rough- 
ness depending, he is inclined to think, on difference of sex. 
Duplicidentata. — What Blasius complains of in the Eu- 
ropseo-Siberian Hares, that they are certainly not numerous, 
but sufficiently intricate, applies still more to the numerous 
species of the other zones. Blasius has not merely lamented, 
but busied himself, along with Bachmann, in unravelling this 
intricacy. 
Blasius mentions, in the Verh. der Versamml. der Naturf. zu Braun- 
schweig, p. 88, that after the examination of an Irish Hare, he finds 
that the Lepus hibernicus cannot be separated as a species from L. va- 
riabilis {L. borealis). He describes, moreover, a new species, L. aqui- 
lonius, already mentioned by Pallas, under the ]L. variahilis, as “ Mmsak.’* 
101 
