SYNTHETOSCIURUS. 91 



b." Superior outline of skull not greatly PAGE 



curved Guerlinguetus 1 03 



b.' Premolars, ~. 



a." Braincase highly arched on posterior 



half of frontals Microsciurus 98 



b." Braincase rounded and slightly arched 



on posterior half of frontals Baiosciurus 100 



c. Size large; total length over 450 mm. 

 a/ Premolars, ^7. 



a." Front of skull depressed at base of ros- 

 trum Araosciurus 106 



b." Front of skull arched at base of ros- 

 trum Parasciuru^ no 



b/ Premolars, ^7. 



a." Tail short, broad, bushy. 



a/" B raincase depressed, inflated laterally . Otosciurus in 

 b." Tail long, narrow, bushy. 



a/" Nasals equal to least interorbital 



breadth Echinosciurus 113 



b.'" Nasals longer than least interorbital 



breadth Hesperosciurns 130 



The first genus of the Sciuridce is remarkable for the slender 

 lower incisors which project outwards, and the upper ones are 

 grooved in the center. But one species is known. 



33. * SyiithetoHciurus. 



Syntheosciurus (sic) Bangs, Bull. Mus. Comp. Zool., 1902, 



Vol. xxxix, p. 25. 



Premolars, ^jj. Size small. Skull thin, papery; rostrum straight, 

 audital bullae small; incisors slender, the lower pair projecting out- 

 ward, the upper with central groove. 



67. brochus (Syntheosciurus!), Bangs, Bull. Mus. Comp. Zool., xxxix, 



1902, p. 25. 

 PROJECTING-TEETH SQUIRREL. 



Type locality. Boquete, Chiriqui, Panama. Altitude 7,000 feet. 



Genl. Char. Size small; ears low, round, woolly; pelage long, soft, 

 woolly; other characters as in genus. 



eT-ffxii>u(}i>-= Synthetosciurus. 



