NOTES ON LIFE-HISTORIES AND DESCRIPTIONS OF ADULTS AND IMMATURE STAGES OF PROCECIDOCHARES KRISTINEAE AND P-LISAE NEW SPECIES (DIPTERA, TEPHRITIDAE) ON AMBROSIA SPP IN SOUTHERN CALIFORNIA

Procecidochares kristineae Goeden, n. sp., and P. lisae Goeden, n. sp. , are described and figured as adults and distinguished from each othe r by their wing patterns, chaetotaxy, and genal color and by these and additional characters from all other North American congeners. Sexual ly dimorphic wing patterns in P. lisae are reported for the first time from this genus. First through third-instar larvae and puparia also a re described and figured for both species, but few morphological diffe rences were found. Procecidochares kristineae and P. lisae are strictl y monophagous tephritid flies forming axillary bud galls on branches o f the native, shrubby, xerophytic ragweeds, Ambrosia dumosa (Gray) Pay ne and A. eriocentra (Gray) Payne (Asteraceae), respectively. Both are circumnatal species that overwinter as first instars within incipient galls in southern California. Further gall and larval development and host-plant regrowth and reproduction are stimulated concurrently by w inter rainfall. Reproduction by P. kristineae is rarely biennial, usua lly univoltine or bivoltine, and rarely trivoltine, depending on local yearly rainfall patterns; whereas, P. lisae usually is univoltine or bivoltine.