Lemurs of the Hapalemur Group. 351 



tjpe-specimen also the angle of the mandible is less rounded 

 and the upper end of the coionoid is thinner, longer, and less 

 curved than shown in Schleo:el's fio-ure. 



The specimen described by Schlegel as H. griseus was 

 •discovered by Pollen at Ambassuana, three days' journey 

 fiom the nortii-west coast of Madagascar. If, as I suspect, 

 the type of //. schlegeli belongs to the same species, it 

 probably came from the north-west coast of Madagascar, 

 possibly also from Ambassuana. 



The Arm-glands 0/ Hapalemur. 



The presence of glands on the forearm in Hapalemur 

 griseus — or, rather, olivaceus, for such one of the specimens 

 proves to be — was first pointed out by Beddard, who also 

 iiscertained, from Jentink and Milne-Edwards, that no such 

 glands are developed in Proleinur simus. This character 

 alone is sufficient, in my opinion, for generic separation of 

 the two species. 



In the two male specimens of H. oh'vaceus^ in which he 

 described the glands, he pointed out that the naked tract of 

 skin above the wrist was covered with long and coarse 

 papilla? ; but, judging from his figures, the papillae were much 

 better developed in the first specimen examined than in the 

 second. 



In the two other skins in the Society's collection, which 

 Beddard did not see — namely, the small one received Nov. 10, 

 1887, and the adult received June 9th, 1903, — the gland 

 differs in that the tract of integument is comparatively 

 smooth, being merely roughened, so far as can be judged on 

 the dried skin, with fine granular papillse. 



With regard to the glands on the upper arm, regarded by 

 Beddard (but, I think, wrongly) as mammse, I can find no trace 

 of them in the small and presumably immature skin ; and in 

 the adult skin with the glandular tract of the forearm nearly 

 smooth they are less well developed than in the specimen in 

 wiiich they were first detected — namely, the one with the 

 glandular area of the forearm exceedingly coarsely papillate. 



I do not think any special importance should be attached 

 to these differences, because in Letnur calta, which possesses 

 similar glands, the spur on the glandular tract of the forearm, 

 which may be compared to the papillse in Hapalemur, varies 



* I hare the dried skin of the example described by Beddard in 1884. 

 Of the second specimen described in P. Z. S. 1891, p. 449, and 1902, 

 p. 159, no history was given, and the skin was not preserved. Probably 

 it was olivaceus. 



