1. MYCETEa. 39 



fur, when it is bent back and examined, as to make one almost 

 doubt if the black specimens are not another state or local variety 

 of the red ones. — Ann. and Mag. N. H. 1845, xvi. p. 217. 



M. I. Geoffrey states there can be no doubt that M. niger and M. 

 stramineus of Geoffroy are the same species, M. niger being the males, 

 and M. stramincKS the females and young. There are in the Jardin 

 des Plantes young males changing into the black state. Stentor 

 Jhvicaudatas, Geoif., is a variety, and S.fascus, Geoff., a pale speci- 

 men oi Mycdes 2irsinus. (See Cat. Mus. Paris, p. 53.) 



Slack observes, " Dr. Gray lays great stress upon the texture of the 

 hairs as a specific distinction. In M. seniciilus the hairs of the adult 

 are soft to the touch, whUe those of the young are hard and rigid." 

 —Journ. Acad. N. S. Phil. 1862, p. 516. 



The species may be divided thus : — 



1. Porehead high, with the hair rclioxed, forming a ridge across 



the centre of the crovni. 



a. The fur rather rigid in 1, 2, 3. 



b. Fur soft, silky, elongate, 4, 5. 



2. Forehead with the hair directed forward ; crown smooth, with 



radiating hairs. 



a. Fur short, rather rigid in 6, 7, 8. 



b. Fur rather soft, 9. 



c. Fur very long, silky, 10. 



1. Mycetes ursinus. The Araguato. B. M. 



Brown or blackish, yellow-washed ; hairs rather rigid, brown, 

 with yellowish tips. Male, female, and junior. 



Mycetes ursinus, Desm. Mamm. ; Pr. Max. Abbild. t. ; Graij, Ann. ^• 

 May. N. II. 1845, xvi. p. 218. Stentor flavicaudatus, &fo^. Simla 

 ursiua, Humb. S. guariba, Ilumb. Mycetes fuscus, Knhl ; Sjnx, 

 Bras. t. 30. 



Var. Yellow ; the tail, head, feet, sides of the head, body, and 

 limbs yeUow. Male. B.M. 



M. stramineus, Spi.c, Bras. t. 31. M. barbatus, fcem., Spix, Bras. 

 t. 33. 



Ilab. Brazil. 



2. Mycetes seniculus. The Golden Howler. B.M. 



Reddish chestnut ; middle of the back golden yellow ; hair one- 

 coloured to the base, short, rather rigid, without anj- underfur ; 

 hair of the head short. Males and females. 



Alouatc, Buff. II. K. xv. p. o ; Siippl. vii. t. 15. Simla seniculus, Linn. 

 S. X. i. p. 37 ; Grail, Ann. Sc May. X. IL 1845, xvi. p. I'lO. My- 

 cetes seniculus, Knhl. Koyal Monkey, Penn, 



Hah. Brazil ; Guiana. In Bohvia a paler variety. 



