14 ARKIV FÖR ZOOLOGI. B\ND 2. N:0 20. 



The majority of the specimens, no less tlian 34 examples, 

 belong to the species A. variahilis, previously known to be 

 common in Cameroon. The varying appearence of this form, 

 mentioned by Peters \, Matschie -, and Werner ^ is very 

 well marked also in this collection, there being all sorts of 

 differences in coloration. 



As to the variety tuherosa, it differs from the typical 

 form by having the skin on the back covered with weil mar- 

 ked tubercles, having a stronger and stouter structure, be- 

 sides by a longer nose and and longer hmbs at least to judge 

 from these two specimens. However, in none of the 15 varia- 

 bilis-specimens I measured, the length of the nose was more 

 than 14,2 7ö of the length of the body, while in this form 

 this measurement was 15,3 and 15,4. 



Possibly, on grounds mentioned, these specimens ought 

 to be distinguished as a species apart, and if the different 

 appearence of the skin on the back proved to be so valuable 

 a character as most authors consider, there would be no 

 doubt of this; but according to my opinion too much stress 

 has been laid upon this character, as far as this genus is 

 concerned. I owe this opinion to the fact that in one or 

 another of the typical variabilis-specimens there are some 

 small tubercles, slightly visible, but still present, but especi- 

 ally to the statement made below for the two specimens of 

 A. macrodactylus, the one having distinct tubercles, the other 

 being total] y in want of such. Moreover, the differences we 

 find in the measurements are based only on two small pro- 

 bably young specimens and therefore perhaps not be paid 

 too much regard to. As I do not like without weighty rea- 

 sons to establish any new species of this genus, being in 

 some respects already divided in too many species, and there 

 is no other described to which this form shows a greater re- 

 semblance than to A. variahilis I put it, as mentioned be- 

 fore, as a variety of this one. 



The diagnosis of it would then be as follows: 



Differs from the typical form in the following points: Skin 

 on the upper parts of body and extremities covered with distinct 

 larger and smaller longitudinal warts, body stronger and stouter, 



' Monatsb. d. K. Akad. Wiss., Berlin 1875. p. 210 (A. dispar). 



2 Sitzber. d. Ges. naturf. Fr. Berlin 1890. p. 173. 



^ Verbandl. d. zool. bot. Gesellscb, Wien 1898. Bd. 48. p. 193. 



