NO. 5 MAMMALS OK I'ANAMA (UilWMAN 125 



lime of his visit to San Mimu-l Island in the spriiij^j of Hjoo. From 

 /). darliui^i of the adjacent inainlaiul it is distiiiji:uishfd at once by 

 imich more intense rufesccnt general coloration. The hind feet are 

 rnsty reddish instead of silvery white. Moreover, the skull is rela- 

 lively narrower, more elonj^ated, with smaller audilal bullae. 



Regarding:: the habits of the species Mr. Wau^s remarks: " Lon- 

 chcrvs lahilis \ ■- l^iplotnys lahilis] was abtmdant in .San Mij^'uel 

 Island. i»iU was wholly arboreal. Mr. Urown eatehinf; all his specimens 

 in (raps set on the branches of large trees. It a|)pears to be diurnal, 

 and on one or two occasions Mr. Brown saw the animal proceeding 

 along the branches with a curious gliding gait, his account suggesting 

 the name 1 have used for the species. It is the ' Katon Marcnero ' 

 of the islanders." 



Specimens examined: San Miguel Island, 14.' 



DIPLOMYS DARLIMGI (Goldman) 



Darling's Spiny Rat 



[Plate 26, fiRs. I, \(i\ 



Isothrix dnrlingi Goldman, .Smiths. Misc. (>)ll., Vol. 60, No. 2, pj). 12-13, 

 S<'|)triiil)cr 20, IQ12. I ypc from Marr.-inaiiti (near Krai <lc Santa 

 Maria), on tlic Rio Tuyra, ca.stcrn Panama. 



This species of Diplomys was first obtained by Dr. S. T. Darling, 

 of the .Sanitary Dep.irtinenl. Isthmian Canal Commission, at Ancon, 

 Can.'d Zone. No member of the genus had jjreviously been taken on 

 the Panama mainl.ind, although an insular form described as 

 Lonchcrcs labilis lianas had been discovered on San Miguel Island 

 in the Bay of Panama. D. darliuf^i is much paler in color than 

 J), lahilis, the general tone of the uppcrparts being ochraceous bulTy 

 mixed with black, instead of the rich rufesccnt tint of J), lahilis. The 

 feet are silvery white instead of rusty reddish as in the latter species. 

 'J'he skull is relatively broader, the zygomata more spreading 

 anteriorly and llx; audital bullae are larger. It may be not very 

 unlike Diplomys caniceps (Cunther) from Medellin, Colombia, but 

 the latter seems to be somewhat difTcrcnt in color, with a bushy t.'iil, 

 .111(1 the skull, as figured. dilTers in detail. 



Of the habits of D. darlin^i little is known except that it is an 

 arboreal animal. The type specimen was seen one morning running 

 up the trunk of a tree and was shot when it paus<'d for a moment, 

 partially hidden by the curvature of the trunk. The tree stood on 

 the low forested bank of the I\io Tuyra where tliat stream meets the 



* Thirteen in collection Mus. Comp. Zool. 



