SCIURUS. 129 
Sciurus fuscovariegatus, Schinz, Synop. Mamm. ii. p. 15 (1845, ex Gray)”. 
Macroxus adolphei, Lesson, Descr. des Mamm. &c. p. 141 (1847, descr. orig.)™. 
Macrozxus pyladei, Lesson, tom. cit. p. 142 (1847, descr. orig.)"*. 
' Sciurus dorsalis, Gray, P. Z. 8. 1848, p. 138, pl. vii. (descr. orig.)"*; Sclater, op. cit. 1870, p. 670”. 
Sciurus rigidus, Peters, Monatsb. Ak. Berl. 1863, p. 652 (descr. orig.)"; Frantzius, Arch. f. Nat. 
xxxv. 1, p. 266; Fischer, Zool. Gart. 1877, p. 21”. 
Sciurus oculatus, Peters, Monatsb. Ak. Berl. 1863, p. 653 (descr. orig.)”. 
Sciurus intermedius, Verreaux (ap. Gray), Ann. & Mag. Nat. Hist. 3rd ser. xx. p. 421 (1867, descr. 
orig.)”. 
Macrozus nicoyana, Gray, tom. cit. p. 423 (1867, descr. orig.)”. 
Macroxus melania, Gray, tom. cit. p. 425 (1867, descr. orig.)™. 
Hab. Muxico (Uhde, Mus. Berol.?"), Amoca (Mus. Brit.), Goazacoalcos (Sumichrast, 
U.S. Nat. Mus.*); Guatemaua (Verreaux, Mus. Brit.?2); Honpuras (Dyson, Mus. 
Brit.®); Nicaracua (Mus. Paris.\*); Costa Rica (Zeledon, Carmiol, U.S. Nat. 
Mus."), Nicoya (Salvin, Mus. Brit.?*), San José (Frantzius & Hoffmann, Mus. 
Berol.'8 °); Panama, Veragua (Arcé, Mus. Brit., Mus. Paris.), Point Burica (Kellett 
& Wood, Mus. Brit.*; Boucard, Mus. Paris.), Obispo (Hassler Exp., Mus. Coll. 
Harv). 
The numerous nominal species whose names are given above were arranged in Mr. 
Allen’s Monograph as synonyms of two species, S. hypopyrrhus? and S. boothie™. An 
examination of the series in the various European Museums, including most of the types, 
enabled me to show that they thoroughly intergrade°, a conclusion which has since 
been accepted by Mr. Allen*. I have even grave doubts as to whether they are really 
separable from the last species. But as I have not yet found specimens strictly inter- 
mediate between S. variegatus and S. hypopyrrhus in the character of the pelage and 
the annulation of the fur, it seems best to keep them distinct. 
In this species the differences in comparative length of tail and ears, on which Mr. 
Allen laid most weight in separating S. boothie from S. hypopyrrhus, cannot be depended 
on; and [have been totally unable to detect any constant difference in general stoutness 
of form or breadth of muzzle. As to colour, the intergradations of the different varieties 
are quite complete; so that it is often difficult or impossible to say to which a given 
specimen is to be referred. Each variety, however, has its own type, and seems to 
predominate in its own immediate locality. The five principal phases known to me 
may be thus arranged :— 
1. The hypopyrrhus type. Upper parts dark grey, the hairs black, ringed with 
white or pale fulvous. Lower parts either concolorous with the upper, or 
washed with rufous. To this variety I agree with Mr. Allen in referring 
Bennett’s S. nigrescens®; and it is to the same form that the description 
of Macroxus boothie in Gray’s memoir of 1867 refers, although that 
author’s Sciurus boothie of 184319 was founded on a young example of 
BIOL. CENT.-AMER., Mamm. Vol. 1, June 1880. S 
