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BANGS: CHIRIQUI MAMMALIA. 
Syntheosciurus,! gen. nov. 
Type: Syntheosciurus brochus, sp. nov. 
Characters. General external appearance much as in Microsciurus, but ear 
still smaller, hardly standing up above the fur, and very woolly; pelage very 
long, dense, and woolly; size larger than usual in Microsciurus ; skull and 
teeth peculiar; skull very thin and papery, with very small, feeble, constricted 
rostrum, with the upper outline (of rostrum) straight; audital bulle small; 
molar teeth as in Microsciurus and peg-like premolar present ; incisors very 
slender and projecting outward (not curved under as usual in tree squirrels) ; 
upper incisors with a well-marked central groove down each. 
Syntheosciurus brochus,? sp. nov. 
Type. — Mus. Comp. Zodl., No. 10,402, ad. g, Boquete, April 80, 1901. 7,000 ft. 
Two adults, g and 9, Boquete, 7,000 ft. altitude, taken together on 
April 30. 
Characters. — Size intermediate between Microsciurus and Guerlinguetus ; 
tail a little less than length of head and body, full and bushy; ear very low, 
round, and woolly; pelage very long, soft, and woolly, with very thick under 
fur; general coloration dark reddish olive, with under parts varying from 
orange rufous to ferruginous; no distinct line of demarcation between colors 
of upper and under parts; skull and incisor teeth peculiar (as pointed out in 
the description of genus). 
Color. — Upper parts finely mixed olivaceous bistre and dull tawny olive — 
the hairs olivaceous bistre, tipped with dull tawny olive ; under fur dark 
mouse-gray ; orbital ring, sides of nose and chin tawny olive; tail similar to 
back, fringed along sides with pale rusty and slightly more reddish, less 
olivaceous below; under parts, especially along middle line, strongly suffused 
with orange rufous in the type (ferruginous in No. 10,403, nursing female). 
Measurements — 
No. Sex. Total length. Tail vert. Hind foot. Ear. 
10,402 type & ad. 320 150 46 17 
10,403 Q ad. 315 145 46 16 
Skull type, adult g, basal length, 35.6 ; occipitonasal length, 44; zygo- 
matic width, 25.2; interorbital width, 12.6 ; palatal length, to palatal notch, 
20; to end of pterygoid, 27.4; length of nasals, 13; width of nasals, 5.8; 
length of upper molar series, 7.6 ; length of single half of mandible, 27. 
Remarks. — Mr. Brown met with this remarkable squirrel but once, when 
he took the pair described. It was unknown to the native hunters who ac- 
1 Sxovpos = squirrel, and Sdv@erTos = combined. 
2 Brochus, with projecting teeth. 
