It is the other one ;-)...
Ramphocelus costaricensis is found on the pacific slope and Ramphocelus passerinii is from the atlantic slope, so yours is actually Ramphocelus costaricensis.
http://darnis.inbio.ac.cr/ubisen/FMPro?-DB=UBIPUB.fp3&-lay=WebAll&-error=norec.html&-Format=detail.html&-Op=eq&id=3432&-Find
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