SCIURIDZ—SCIURUS BOOTHL”. 743 
along the sides, midway between the edge of the ventral surface and the 
middle of the back, and in having rather less white below. In No. 11412, 
the color of the middle of the back is nearly uniform blackish-brown, with a 
quite well-marked grayish subdorsal band; the ear-patches are pure white, 
and there are large areas of white on the ventral surface. In No. 11411, the 
upper parts are dull faded reddish-brown instead of blackish-brown; the light 
lateral band is still better marked, and the white below is restricted to a spot 
at each arm-pit. Four other specimens are similar to the last, except that 
the lateral band is more or less whitish, and the tail is more broadly edged 
with white. The white of the lower surface is sometimes confined wholly to 
the throat and breast, and sometimes forms a narrow, more or less interrupted, 
mesial line, widening over the posterior part of the ventral surface. In No. 
11421, the lower surface is rusty-yellow, with the upper parts paler than in 
any of the preceding. No. 8506 (from Nicaragua) is wholly pale yellowish- 
brown above and rusty-yellow below, with white arm-pits. The above- 
‘mentioned pale-grayish lateral band is placed high up on the sides, and does 
not correspond in position with the usual ‘lateral line” which marks the 
division of the ventral from the dorsal surface. 
As would be expected, these phases of coloration have given rise to 
numerous synonyms. Lesson’s Macroxus adolphei and M. pylader seem both 
referable here, the former agreeing with No. 11364, described above, except 
that the entire lower parts are white instead of having the white restricted to 
irregular large patches; the latter (AL. pyladei) agrees closely with the usual 
Costa Rican phase of this species, in which the ear-patches and the whole 
lower surface are rufous.* Both were deseribed from Central American 
* Lesson’s above-cited work being rare in American libraries, I append an exact transcript of his 
descriptions, kindly furnished me by Dr. E. J. Nolan, Secretary of the Academy of Natural Sciences of 
Philadelphia, from the copy of Lesson’s work contained in the Academg’s library, the only copy in this 
country of which I have knewledge :-— 
“19, L°ECUREUIL D’ADOLPHE. 
“ ( Macroxus Adolphei, Lesson) 
“Cet 6cureuil, par son facies, rappelle ’écurenil du Pylade, et cependant sa coloration est différente. 
Le male et la femelle ont été tués par mon trére, Adolphe Lesson, dans les foréts qui avoisinent Realejo, 
dans la province de Nicaragua, du centre-Amérique. Est-ce une variété du suivant? ‘ 
“Plus fort que le pyiade, Vécureuil d’Adolphe a la queue de Ja longueur du corps, et cette partie a 
la méme nature de poils et la méme coloration que le pylade, excepté son sommet, qui a une touffe noire 
et un bouquet biane terminal. Les poils de cette queue sont roux en dessus, ondés de noir et terminés de 
blanc. Le blanc est plus apparent sur les portions latérales et en desseus. 
“Te male a le dessus de la téte brun tiqneté de gris, le dessus du corps varié de noir luisant et de 
roux vif par ondulations; ie dessus des membres est également varié de roux et de brun; mais les ex- 
trmités en dessus sont Drunes tiquetées de gris-roux. Deux grosses touffes blane-neigeux, placées dér- 
rire les oreilles, tranchent sur le pelage, et le pylade a deux plaques de méme forme, rouge-chamois ; 
