12 ARKIV FÖR ZOOLOGI. BAND 3. NiO 12. 



Bufo marinus L. and Bufo crucifer Wied. 



As far as I caii judge 25 specimens of the toads belong 

 to the species Bufo marinus L. and 5 to B. crucifer Wied. 

 Of the former, which vary in length between 19 and 195 mm., 

 14 are from Tatarenda, Bolivia, Chaco 1902, 4 from Salta, 2 

 from Quinta, Argentina, Erl. Nordenskiöld ; the other five have 

 been taken by Holmgren at San Fermin, Mojos and Tuiche, 

 Bolivia. The five crucifer-specimens, varying in length be- 

 tween 21 and 36,.') mm., have been found by Holmgren at 

 Tuiche, Bolivia and Vacamayo, Peru. 



The smallest crucifer-specimens and two of the smallest 

 marinus-specimens agree completely in colour. The ground- 

 colour in these is olive gray with regnlar dark spöts, placed 

 in pairs on' the back, which also has a light median line; 

 the lower surfaces are light and the limbs are distinctly 

 cross-banded. But the nose is more acuminate in the crucifer- 

 specimens and the hind limbs and the toes are longer than 

 in B. marinus. In the former the hind limbs are thus 155 

 — 157 '^/o, the tarsus with the 4th toe 64—65 7o, of the length 

 of the body, but in the latter these measurements are not 

 higher than 140 and 60 'Vo- In the larger specimens this 

 difference becomes still more distinct, the largest crucifer- 

 specimen (36,.') mm.) having these measures 167 and 71,2 '^ o, 

 but a marinus-specimen of the same length (39 mm.) respec- 

 tively only 126 and 54 '^/o. 



By the table below vve find that the hind limbs in B. 

 marinus vary in length rather much, but in none they pass 

 140 7o of the length of the body. In the smallest specimens 

 they seem to be longest, but a great variation may be said 

 to exist both in small and large specimens. 



The paratoids, on the contrary, grow very regularly with 

 age; being in the youngest specimens only half as long as 

 their distance to the tip of the snout, they become longer 

 and longer, being in specimens of about 100 mm. equal with 

 this distance and in still larger specimens considerably longer. 



