LONNBERG, MAMMALS. 41 



B. n. atigmatux K. campestris 



Horizontal distance between anterior brims of the orbit at the middle ... 47 mm. 13 mm. 



Horizontal distance between the lower brim- of the orbit at the middle . (55 60 



Hori/ontal diameter of the orbit . . 30 27 



Another expression for the greater orbit of P. . stigmatus is found in the vertical 

 through its anterior margin passing almost along the anterior border of the second 

 molar, while in P. campestris the corresponding vertical passes almost through the 

 middle of the second molar. 



The maxillary below the orbit has also quite a different shape in the two ani- 

 mals. It is much higher and its outer wall above the molar series is more vertical 

 in R. >i. stigmatus; in R. campestris it is lower but convex, almost inflated between 

 the molars and the anteorbital fossa. This is proved by the following measurements 

 from the same skulls as those used above 



R. n. stigmatus R. mmpestris 

 Vertical distance from anterior alveolar margin of middle molar to lower 



margin of anteorbital fossa 20 mm. 14, s mm. 



1'istancc between the outer sides of the first molars 37.5 > 33 



Greatest width of skull at the maxillaries on a level with the middle 



of the first molar 42,5 * 43 



If the second of these measurements is subtracted from the third and the thus 

 received sum is divided in halves AVC get an expression for how much the maxillary 

 protrudes beyond the outer surface of the molars on either side of the two species 

 viz. in R. n. stigmatus 2,5 mm. but in R. campestris 5 mm. This difference is the 

 more striking as the greatest width across the maxillaries is in the latter species 

 situated much nearer to the alveolar margin than in E. n. stigmatus. The second of 

 the three last measurements indicates as well that the palatal breadth of R. campestris 

 is less than that of P. it. stigmatus. 



The length of the horns of the greatest of the two R. n. sligmrttux at hand is 

 not quite 9 cm. and their tips sit only 44 mm, apart while the same distance in 

 the other specimen is 53 mm. 



The nasals of R. n. stigmatus are not especially elongated but longer than in R. 

 campestris. They measure in the present two specimens resp. about 40 and 49 mm. 

 In this respect this species resembles two other species of Rhaphicerus for which 

 JENTLNK (1. c. pp. 40, 41) has used the specific names rufescens (H. SMITH) and 

 iKeUeni JENTINK*. The latter species is from Angola and differs in having the 

 horse-shoe-shaped brown marking on the crown of the head broadly developed 

 , upper parts of a chocolate-milk brown*, - the horns in the male - 



- bent back, slightly curved*, - nipper surface of skull feebly roughened > 



. If R. kelleni has a high maxillary like P. n. stigmatus or low like R. cam- 

 pestris is not indicated in the description. 



Of what he considers to be R. rufescens (H. SMITH)*, JENTINK has only had 

 a female. This is said to have been procured from the dealer FRANK in Amsterdam 

 and it once belonged to Dr. SUNDEVALL'S collections and its habitat seems to be 

 Natal, (JENTINK 1. c. p. 40). SUNDEVALL often exchanged specimens with FRANK 



Sjdsi.edtn Kilimandjaro-Mertt Expedition. 2. 6 



