34 PROCEEDINGS OF THE ACADEMY OF [1897. 



OBSERVATIONS ON TARSIUS FUSCUS. 

 BY HARRISON ALLEN, M. D. 



The Academy of Natural Sciences of Philadelphia possesses an 

 adult female of Tarsius fuscus which through the courtesy of the 

 curators I have recently dissected. The specimen was purchased of 

 Mr. H. A. Ward of Kochester, and is without locality. I propose 

 to describe the superficies, auricle, rugae, bones and muscles, and 

 compare them especially with the account of the corresponding parts 

 in the allied species Tarsius tarsius, as given in Burmeister's mon- 

 ograph. 1 This memoir, elaborately detailed and beautifully illus- 

 trated by the author, stands in such high repute that anatomists 

 have accepted the account of the genus as final. Mivart and Muir 

 in their descriptions of the structure of the Lemuroidea 2 omit Tar- 

 sius. Nevertheless, I have been induced to make this record because 

 of the specific independence of the Academy's specimen, as well as 

 for the reason that variations in structure should be made the sub- 

 ject of special scrutiny. Apart from these considerations, I believe 

 the warmest admirer of the memoir will admit that the teeth are 

 imperfectly described, and the references to the mechanism of the 

 limbs inadequate. When a muscle is not described in this essay, 

 it will be understood that Burmeister's account has been found to 

 agree in all respects with my own. 



The abdomen had been opened, the symphysis pubis divided and 

 the organs of generation, as well as the greater part of the intestines, 

 removed before I received the specimen. 



THE SUPERFICIES. 



The fur generally is long and silky. The tips on the back and 

 sides are dark brown, on the crown and sides of the neck gray, with 

 a disposition to become lighter in hue toward the rump. The hair 

 of the head has a subtip of obscure chestnut, elsewhere with the ex- 

 ceptions named, the basal two-thirds are dark plumbeous. On the 

 under surface of the trunk the fur is light at the tips, while on the 

 inner side of the thigh it is almost white. The inner parts of the 



1 Beitrilge znr niiheren Kenntniss der Gattung Tarsius, von Hermann Bur- 

 meister. Berlin, 1846, 4°, pp. 140, pis. vii. 

 s Zool. Trans., VII, 1866. 



