NO. 2057. THE GRASSHOPPER MWE—HOLLISTER. 433 



Size larger, with larger skull (condylobasal length, 25.4-28.0; breadth brain- 

 case, 12.9-13.6); ears smaller (12.6-15.8). 

 Color paler; the young much grayer, less blackish; hind foot less than 



22 mm O.l. missouriensis, p. 438. 



Color darker; the young more blackish, less gray; hind foot 22 mm 



0. I. leucogaster, p. 434. 



Ear tufts cinnamon-brown or smoky, not conspicuously different from color of 

 crown. 

 Skull elongated, with high braincase. 



Ear large (15.0-16.9 mm. from notch) 0. I. longipes, p. 451. 



Ear small (11.9-13.9 mm. from notch) 0. I. breviauritus, p 453. 



Skull not elongated; braincase flattened. 



Color very dark; more sooty, less brown 0. l.fuliginosus, p. 447. 



Color less dark; more brownish, not sooty. 

 Size larger (skull, condylobasal length, average, 26.2; zygomatic breadth, 



14.8) 0. I. ruidosse, p. 448. 



Size smaller (skull, condylobasal length, average, 25.1; zygomatic breadth, 



14.0) 0. I. capitulatus, p. 450. 



Size averaging smaller; tail relatively long, usually more than half the length of head 

 and body; skull averaging smaller, witli comparatively wide interorbital region; 

 teeth lower crowned, unworn cusps of ??i' longer than high; m^ smaller, broadened 



transversely; m* usually more than half the length of tooth row O. torridus. 



Color of adults in fresh pelage pale pinkish-cmnamon ; not drab, brown, nor decid- 

 edly dark pinkish-cinnamon. 

 Anterior palatine foramina short, not extending backward to plane of fronts of 



first molars 0. t. longicaudus, p. 463. 



Anterior palatine foramina longer, extending backward fully to plane of fronts of 

 first molars. 



Size larger (total length, 146-161; tail, 57-58; hind foot, 20-22) 



0. t. perpallidus, p. 459. 



Size smaller (total length, 120-146; tail, 37-53; hind foot, 18-20.5). 



Color very pale pinkish-cinnamon 0. t. pulcher, p. 461. 



Color rich, intense pinkish-cinnamon 0. t. clarus, p. 465. 



Color of adults in fresh pelage brown, drab, or decidedly dark pinkish-cinnamon; 

 not pale pinkish-cinnamon. 

 Color of adults grayish-drab; not brown or cinnamon. 



Ear small (14.0-15.1) 0. t. tularensis, p. 466. 



Ear large (15.2-17.1) O.t. canus, p. 471. 



Color of adults brown or dark pinkish-cinnamon; not grayish-drab. 

 Head and face, in fresh, full pelage, dark brown, much darker than back; gen- 

 eral coloration darker. 

 Size smaller (total length, 137-148; hind foot, 19-21); ear small (14.2-15.4) 



O.t. ramona, p. 468. 



Size larger (total length, 148-155; hind foot, 21-22); ear large (16.7-16.8). . . . 



O.t. macrotis, p. 469. 



Head and face, in fresh, full pelage, light brown, not conspicuously darker than 

 back; general coloration lighter. 



Ear tufts in full pelage white, conspicuous; ear small (12.0-15.8) 



O.t. torridus, p. 456. 



Ear tufts in full pelage buffy-cinnamon, not conspicuous; ear large (15.2-17.8). 



Size larger, with longer tail (55-64); audital bullae large 



O.t. surrufus, p. 472. 



Size smaller, with shorter tail (47-57); audital bullae small 



0. t. yakiensis, p. 470. 



34843°— Proc.N.M.vol.47— 14 28 



