On the Holotype of Parazetes auchenicus. KOS 
readily into this scheme, owing to their abnormal colour. 
But their positions seem clear enough, viz. :— 
Mico melanoleucus, Rib., is a Mystax. 
Hapale chrysoleuca, Wagn, (incl. sericeus, Gray), is a 
true Hapale. 
And the following new species is a Mico :— 
Mico leucippe, sp. n. 
Like Hapale chrysoleuca, but the ears untufted, nearly . 
naked. Head, fore limbs, body, and hips quite white ; lower 
legs, feet, and tail light golden yellow, not so strong as in 
chrysoleuca. 
Teeth with the structure typical of Hapale, not of 
Mystax. 
Dimensions of the type (measured in the flesh by Friulein 
Snethlage) :— 
Head and body 235 mm.; tail 342; hind foot 64; 
ear 30. 
Skull: greatest length 48:5 ; basal length 33°8 ; breadth 
of brain-case 26°2; maxillary tooth-row 11°8. 
Hab. Lower Amazons. ‘Type from Pimental, Rio Tapajoz. 
Type. Adult male. B.M. no. 9.3.9.2. Original num- 
ber 14. Collected 13th November, 1908, by Fiiiulein Dr. E. 
Snethlage. Presented by the authorities of the Museum 
Goeldi, Para. 
This beautiful white marmoset had been supposed to be 
Hapale chrysoleuca, but is readily distinguished by its wholly 
untufted and almost naked ears. ‘Two specimens were 
obtained by Fraulein Snethlage, both quite alike. 
‘Shot in deep forest.”—Z. S. 
XXI.—The Holotype of Parazetes auchenicus, Slater 
(Pyenogonida). By W.T. Cauman, D.Sce., F.R.S. 
(Published by permission of the Trustees of the British Museum.) 
IN a paper published in this Magazine in 1879 (ser. 5, vol. iii. 
p. 281), the late Mr. H. H. Slater described a Pycnogon from 
Japan as Parazetes auchenicus, gen. et sp.n. He stated that 
