34 KM'I) ANDERSEN 



nhoays wanting:: in RJ(. fimiigatus ; I Iuin'o liad the opiiorluiiily 

 of cxaiiiining eight spcciinciis of the; typical form; in one (a 

 youngish in(hvidual, cotype of Rh. macrocep/talus) an cxcceiUngly 

 niinulc^ }r is present on both sides, situated (piite on the external 

 aspert of llie maxillary bone; llie same is the case in the Asmara 

 specimen (adult, teeth almost unworn) sent from tlie Genoa 

 ^Museum; in Senna's figure of an Erythrea skull (1. s. c. figs. 36 

 and 37) I find not only a p^ but even a \), ; this is the only 

 instance known to me of the presence of a rudimentary p^ in 

 Rh. famigatus. — (3) Rh. hildebtmndti , Pet., from Mazoe to 

 Kenya, at once distinguished by its very large size; \)^ is only 

 occasionally wanting, p- as a rule present. — (4) Rh. eloquens, 

 K. And., a])parently confined to Uganda, in size intermediate 

 between Rh. funiigatus and MldebrandU , with \>^ almost 

 always completely lost, and })- still more reduced in size than 

 in hildebrandtl. 



Rh. ferrum-equhium is of jiractically tlie same size as Rii. 

 famigatus ; p^ is very often, })- not rarely lost, and whenever 

 thes(^ small premolars are present , they are external ; in so far 

 tliere is some resemblance between the two species, and this is, 

 no dou))i, the reason why Peters regarded them as very closely 

 related (') , and Dol)Son (in 1878, 1. s. c.) even as inseparable. 

 But they are in many respects fundamentally different : — The 

 skull of fumigatus (and allied Ethiopian species) is at once 

 distinguished by its very high and abruj)tly projecting nasal 

 swellings and stronger sagittal crest; as a conse(pienc(^ of these 

 two peculiarities the postnasal depression (between the nasal 

 swellings and the front of the sagittal crest) is much deeper than 

 in ferrum-equiniitn; the cranial rostrum is somewhat narrower, 

 the occipital portion of the skull slenderer; the ears l)roader 

 scarcely attenuated below the tip, the tip itself blunter; the sella 

 considerably broader, h'ss ])andurate, and its front face densely 

 covered with ivither long hairs; the jiosterior cciunecting process 

 lower and more rounded off; the indices of llie ihird. foiu'ih. and 

 tiflh melai-arpai are. respectively, (il)!2. 7"i(). and Ih^i. whi-reas in 

 fcrruin-rquinum lliey are (\h\. l^-lh. and 7/i3, i. e. the jteculiai' 

 shor1(Miing of the lliird metacarpal in fcrraiii-cquinuin is noi 



