bangs: chikiqui mammalia. 25 



Syntheosciurus/ gen. nov. 



Type : Sijntheosciurus 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 

 Ion", 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 bulla; small ; 

 molar teeth as in Microsciurus and peg-like premolar present ; incisor.s very 

 slender and projecting outward (not curved under as usual in tree squirrels) ; 

 upper incisors with a icell-marked central groove down each. 



Syntheosciurus brochus,- sp. nov. 



Type. — Mus. Comp. Zool., No. 10,402, ad. $, Boquete, April 30, 1901. 7,000 ft. 

 Two adults, $ 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 

 orano-e 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 rutous in the type (ferruginous in No. 10,40.3, nursing female). 



Measurements — 



Skull type, adult $, 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 'S.Kiovpos = squirrel, and ^vvOeros = combined. 



2 Brochus, with projecting teeth. 



