neioSuh.'^peciesof^l(itac\\ivn^. (105 



wliole upper surface i.-? uniform grey. Under surface white, 

 not very sharply defined, the iuiirs white to their roots, 

 except just on the sides of the belly. Crown and muzzle 

 scarcely darker than back ; supraocular patches very large, 

 about 13 mm. in greatest diameter, and only about 3 mm. 

 from each other, the separating line being quite narrow. 

 Arms and legs grey like body ; hands and feet whitish. Tail 

 with its white end about one-third of its scaly portion. 



Dimensions of the type (measured on a re-made skin) : — 



Head and body 255 mm. ; tail 260, its scaly part 200, its 

 white tip 70; hind foot 38. 



Skull: condylo-basal lengtli 58-5 ; ms^-^ lO'o. 



J]ah. Central Bolivia. Type from Santa Cruz do la 

 Siena. 



Ti/pe. Adult female. B.M. no. 47. 11. 22. 15. Collected 

 by Mr. Thomas Bridges. 



Evidently most nearly allied to the Paraguayan form, but 

 distinguishable by its greyer colour (even if somewhat faded), 

 the larger supraocular patches with unusually narrow division 

 between them, the whiter under surface, and shorter white 

 tail-tip. 



Metacldrus nudicaiidatus imhutus, subsp. n. 



Most nearly allied to M. n. phwurus^ with which it agrees 

 in the reduction of the white on the tail, but the body — and 

 especially the flanks — strongly suffused with ocliraceous, in 

 this respect closely matching the more northern M. n. colom- 

 hicnius, Allen. Back darker along the middle line, but 

 without a definite stripe. Under surface dull whitish from 

 chest to anus, the throat and bands along sides of belly clear 

 ocliraceous. Crown and centre of nape black. Supraocular 

 spots small, ocliraceous. A well-marked ocliraceous patch 

 behind the base of the ear. Line from eye to ear bhickish. 

 Ciieeks dull ocliraceous. Forearms and legs grey ; metapodials 

 dark brown, digits whitish. Tfiil on the upper side dull 

 brown neaily to the tip, below dull brownish wliite. 



Dimensions of the type (-neasured in the flesh) : — 



Head and body 238 mm. ; tail 259 ; hind foot 39 ; ear 29. 



Length of lower jaw 40*5. 



Bab. Mindo, Ecuador. 4200'. 



Ti/pe, Adult male. B.M. no. 13. 10. 24. 71. Original 

 number 183. Collected 12th Ju-ie, 1913, by Gilbert 

 Hammond. Presented by Oldfirld Thomas. One specimen. 



M. n. phceurus is the form characteristic of llie humid 

 western lowlands of Ecuador, and has a remarkably dull 



