Attempts were made to identify bacteria normally associated withAnastrepha suspensa(Loew). Isolations (70), were made under aerobic conditions from apparently healthy field-collected larvae and larval trails in infested guavas, as well as from laboratory-reared eggs and larvae.Four different bacteria,Micrococcussp. (flavus-like),Erwiniasp.,Pseudomonassp., andP. ovalisChester were encountered. Although possible, none were isolated with such regularity as to suggest an intimate symbiotic relationship.