The tadpole and advertisement call of Scinax pachycrus (Miranda-Ribeiro, 1937) are described. One multipulsed note of 305.5ms mean duration and dominant frequency of about 1.8kHz composed the advertisement call. The tadpole presented dextral proctodeal tube positioned above, not reaching the margin of lower fin; anteroventral oral disc; labial tooth row formula 2(2)/3. Based on the larval characters of S. pachycrus, the inclusion of this species in the S. ruber group is corroborated.
