714 SHUFELDT—OSTEOLOGY OF THE STRIGES. [Dec. 7, 
bubonine genera, as for instance Budo or Speotyto. The post- 
palatine blades are broadish, flat and thin, quite unlike other Owls. 
This Long-eared Owl has a mandible of the same general pattern 
as seen among the S¢rigtde generally. The bone is rather light ; 
the inturned processes of the articular ends are longer than usually 
seen in other species and genera; the superior margin of either 
ramus, near its middle, is gently curved outward ; the ramal vacuity 
is ragged and slit-like in the longitudinal direction. Fig. 6 and 
Fig. 30, Pl. XVII, give a good idea of the skeleton of the trunk in 
Asio, and I would only call attention to one peculiarity here, and 
we are to note that the grooves on the front of the sternum for artic- 
ulation with the coracoids decussate, as they do in certain diurnal 
Raptores. This is not the case in Strix pratincola, but is seen in 
Bubo maximus and other bubonine Owls. 
The clavicles are firmly united below, and a coracoid is pierced 
through its shaft in the same manner as we found it in Sfeotyto. 
The wing bones are comparatively long, and the humerus (PI. 
XV, Fig. 22) alone pneumatic, and it highly so, the foramen being 
almost circular and flush with the general surface of the bone. I 
have not seen the os prominens in this species, and am inclined to 
believe that it is either very rudimentary or perhaps entirely absent. 
The expanded portion of the first phalanx of index digit is very 
thin, and divided near its middle by an oblique osseous ridge. We 
noted that it was solid and nearly of uniform thickness in Budo, 
twice perforated in S¢rzx. 
Respecting the pelvic limb, the long bones of thigh, leg and 
metatarsus offer no special departures from those structures in ordi- 
nary Owls at large; but in the foot, attention is called to the rela- 
tive lengths of the first and second phalanx of the third toe. These 
are subequal, to be sure, but not in the same degree as we found in 
Budo, for here in Aso the second phalanx is relatively longer than 
the same joint in the Great Horned Owl. 
Several species of the genus Syrnzum present us with interesting 
characters in their skeletons. 
Dr. Robert Collett has given us quite a number of good figures 
of the skulls of various species of Syzzzum in his well-known me- 
moir entitled ‘*‘ Craniets og Oreaabningernes Bygning hos de nord- 
europeiske Arter af Familien Strigide,’’ a translation of which, 
including additional matter and all the original plates and figures, has 
been published by the present writer, as stated in the Introduction, 
