16 DIDELPHYS. 



Color. Upper parts and sides black, with occasional long white 

 hairs, mostly on dorsal region; face and forehead whitish; around the 

 eyes and line in the center of the crown, black; under parts white 

 shaded with dusky; legs and feet black, digits reddish, half way from 

 claws on hands, only at base of claws on feet; tail black at base, 

 remainder flesh color. 



Measurements. Total length, 640-940; tail vertebras, 250-535; 

 tarsus, 56-80. Skull: total length, 91; Hensel, 80; zygomatic width, 

 47; mastoid width, 27; interorbital constriction, 6; palatal length, 

 palatal arch to alveoli of incisors, 53 ; length of upper molars, 20. 



a.^texensis (Didelphisf), Allen, Bull. Am. Mus. Nat. Hist., 1901, p. 172. 

 TEXAS OPOSSUM. 



Type locality. Brownsville, Cameron County, Texas. 



Geogr. Distr. Coast region of Texas from Nueces Bay southward, 

 and the lower Rio Grande Valley as far at least as Del Rio, Val Verde 

 County, sporadically northward to San Antonio; Matamoros, State 

 of Tamaulipas, Mexico. 



Genl. Char. Like D. mesamericana, but tail relatively longer; 

 nasals longer, usually terminating posteriorly in an acute angle. 



Color. Like D. mesamericana. 



Measurements. Total length, 698-820; tail, 255-410; tarsus, 

 58-73. Skull: total length, 95-128; basal length, 87-117; zygomatic 

 width, 46-70; length of nasals, 41-57 ; palatal length, 53-70; length of 

 upper molar series, 19-21. 



b. tabascensis (Didelphis!}, Allen, Bull. Am. Mus. Nat. Hist., 1901, 



P- *73- 

 TABASCO OPOSSUM. 



Type locality. Teapa, State of Tabasco, Mexico. 



Geogr. Distr. State of Vera Cruz to that of Tabasco, and across 

 State of Chiapas, Mexico, to northern Guatemala. 



Genl. Char. Nasals long, terminating posteriorly in a pointed 

 angle; color similar to D. mesamericana; tail long. 



Color. Apparently not different from the typical form, except 

 that the under parts are yellowish. A black and gray phase exists. 



Measurements. Total length, 684-1017; tail, 318-463; tarsus, 

 57-75. Skull: total length, 90-139; basal length, 82-122; zygo- 

 matic width, 45-62.5; length of nasals, 43.5-60; across postorbital 

 processes, 21-26; interorbital constriction, 10.5-13.3 ; mastoid breadth, 

 26-42; palatal length, 53-76.5; length of upper molar series, 19-20.6. 



15. richmondi (Didelphis!}, Allen, Bull. Am. Mus. Nat. Hist., 1901, 

 P- i?5- 



