lyon] the hares and their allies 4^9 



and are last seen on the seventh pair of ribs. The shafts of the 

 ribs are relatively narrow and there is no indication of the wide 

 expansion found in Lcpits. Decidedly the widest part of the rib is 

 just behind the spine. 



Shoulder Girdle and Upper Extremity (pi. xcvii, 4). — The scapula 

 of Pronolagus is different in form from the same bone in Lcpus and 

 in Sylvilagiis, and has relative proportions about the same as are 

 found in Romerolagus. It is relatively long and narrow, the su- 

 perior border relatively less convex, the antero-superior angle moder- 

 ately pronounced, and the supra-spinous fossa relatively narrow. 



Regarding the humerus of Pronolagus there is nothing peculiar 

 by which it can be distinguished from the humeri of many of the 

 other genera. 



The form, relative sizes, and positions of the radius and ulna (pi. 

 xcviii, 7) are much alike in Pronolagus and in Oryctolagus. The 

 bones are about subequal in size ; the ulna is not reduced in the middle 

 of its shaft, and is situated external to the radius rather than behind 

 it. Both bones are moderately slender. The radius is equal to the 

 humerus in length. 



The carpus, the metacarpus, and the phalanges of Pronolagus are 

 entirely similar in form and position to these same bones in any of 

 the Leporidae as detailed in the general account of the wrist and 

 the hand (page 378). 



Pelvis and Lozvcr Extremity. — The os innominatum of Pronolagus 

 resembles, in most respect, the same bone in the genera Syhc'ilagus 

 and Oryctolagus, but the ilium is even narrower than it is in them, 

 and its ventral edge is straight, in this respect resembling the ilium 

 of Romerolagus. 



The femur, the tibia, and the fibula (pi. xcix, 3) of Pronolagus 

 are typical for the family as detailed in the general account (page 

 382) and show nothing that is peculiar for the genus. 



The basal width of the metatarsus is contained about two and a 

 half times in the length of the third metatarsal. 



The combined lengths of the three phalanges of each of the hind 

 toes approximately equal the length of the metatarsal to which they 

 are attached. 



The genus is represented by a single skeleton, Pronolagus crassi- 

 caudatus from South Africa. 



Pronolagus is a peculiar genus, first classed as Lepus and later as 

 Oryctolagus. It has not much to associate it with the former, and 

 but little with the latter. In the structure of its teeth, postorbital 

 processes, palate, and zygoma, it appears related to Romerolagus. 



