2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 63 



greatest breadth of nasals, 11 ; interorbital breadth, 14.1 ; postorbital 

 breadth, 8.5 ; palatal length, 45.6 ; upper molariform tooth row, 26.4 ; 

 upper premolar series, 11. 6. 



Remarks. — While the water opossum of Middle America and Co- 

 lombia is very similar in size and color to C. minimus of north- 

 eastern South America it differs in numerous cranial details from 

 that animal as figured by Burmeister." The nasals are conspicuously 

 longer and very diiTerent in form. The sagittal crest develops in 

 both sexes early in life. In a specimen from Rio Frio, Cauca River, 

 Colombia, the tail is black to the tip. 



Specimens examined. — Total number, ii, as follows: 



Panama: Cana (type), i. 



Costa Rica : San Jose, i ; exact localities unknown, 3. 



Nicaragua: Matagalpa, i. 



Colombia : Bagado, i ; Barbacoas, i ; Guanchito, i ; Porto Frio, 

 Cauca River, i; Palmira, i. 



LONCHOPHYLLA CONCAVA, new species 



Type from Cana (altitude 2,000 feet), eastern Panama. No. 

 179621, skin and skull, male adult, U. S. National Museum (Bio- 

 logical Survey Collection), collected by E. A. Goldman, May 20, 

 1 91 2. Original number 21 701. 



General characters. — Similar in size to L. mordax, but color 

 darker; cranial and dental characters different, the second upper 

 premolar notably narrower, and in the reduced development of the 

 internal lobe more like that of the much larger species, L. hesperia. 



Color. — About as in Glossopliaga soricina; general color of upper 

 parts near warm sepia (Ridgway, Color Standards and Nomencla- 

 ture, 1912), the under parts and basal color of fur of upper parts 

 somewhat paler. 



.Skull. — Broader and more massive than that of L. mordax, the 

 l)raincase larger and more fully inflated ; interpterygoid fossa 

 broader ; coronoid process lower, the upper outline more broadly 

 rounded ; angle of mandible longer ; incisors slightly larger ; second 

 upper premolar much less extended transversely owing to reduction 

 in size of inner lobe; molar crowns more quadrate, less triangular 

 in outline. Compared with that of L. hesperia the skull is much 

 smaller and relatively shorter and broader, the braincase relatively 

 larger but flatter above ; coronoid process with less broadly rounded 



' Fauna Brasiliens, pp. 72-73, pi. 11, figs 3-4, 1856. 



