This name is a synonym of Comarostaphylis arbutoides subsp. costaricensis (Small) Diggs.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Publ. Field Mus. Nat. Hist., Bot. Ser. 4: 320 1929.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:17769-2.
This name was in version 1 of The Plant List, record kew-2647175, and has not been changed.