Wetmore — New Species from Cave Deposits. 81 



portions in the different bones is without explanation. Tyto cavatica is 

 a small barn owl of the group of species containing Tyto glaucops, insularis 

 and bargei and like these is distinct specifically from Tyto perlata of the 

 North American continent, Cuba and the Bahamas. 



Corvus pumilis, sp. nov. 



Characters. — Ulna similar to that of Corvus palmarum Wiirttemberg, 

 but distinctly longer, olecranon relatively longer, heavier and broader at 

 tip; external margin bounding carpal articulation more produced; and shaft 

 compressed to form an angular margin on inner side directly above carpal 

 articulation. 



Description. — Type, Cat. No. 4925, Dept. Vert. Pal., American Museum 

 Nat. Hist., right ulna, from Cueva San Miguel, near Morovis, Porto Rico, 

 collected in July, 1916, by H. E. Anthony. 



Ulna with olecranon produced and strong, tip broad and blunt on the 

 end, where it is impressed by an indistinct shallow pit; internal glenoid 

 surface broadly elliptical, placed obliquely to the axis of the bone and 

 with a shallow raised margin; external glenoid surface produced as a thin 

 flattened plate, with outer margin slightly rounded and postero-external 

 edge produced to form a right angle; insertion of external portion of 

 triceps marked by an angular ridge ; a distinct external ridge with an acute 

 margin on shaft immediately below head; shaft with a slight external 

 convexity; nutrient foramen on inner surface, 25 millimeters from ex- 

 tremity of olecranon; paillae for attachment of secondaries fairly promi- 

 nent; external margin of carpal head produced, extending slightly beyond 

 margin of shaft. 



Measurements. — (Of type.) Total length 68 mm., diameter of shaft 

 on external surface 4 mm. 



Range. — Known only from Cueva San Miguel near Morovis, Porto 

 Rico. (Extinct.) 



Remarks. — This species is represented by a single ulna from Cueva 

 San Miguel near Morovis. From Corvus leucognaphalus, known as a 

 living bird in Porto Rico, the present species is distinguished readily 

 by its smaller size. In study skins of four females of C. leucognaphalus 

 that I collected during 1912 on the eastern slopes of El Yunque de Lu- 

 quillo in Porto Rico, the ulna measures 75 mm. in length in three speci- 

 mens, and 76 mm. in the fourth. As the female in leucognaphalus is 

 distinctly smaller than the male it will be seen at once that the ulna from 

 Morovis, with a total length of 68 mm., lies well outside the range of 

 variation in leucognaphalus. In a skeleton of C. palmarum, the small crow 

 from Santo Domingo, the ulna measures 62 mm. The species described 

 here is intermediate in size between palmarum and leucognaphalus and 

 thus is larger also than C. minutus from Cuba, or the peculiar slaty 

 colored C. jamaicensis from Jamaica. 



In former years, therefore, there were two types of the genus Corvus 

 on Porto Rico as there are today on Cuba and on Santo Domingo. 



