Procecidochares stonei Blanc & Foote is a facultatively multivoltine, stenophagous, gall-forming fruit fly on Viguiera laciniata Gray and V. deltoidea Gray var. parishii (Greene) Vasey and Rose [now in the genus Bahiopsis, and the variety elevated to species] (Asteraceae) in southern California. ...

The axillary bud galls of P. stonei were found on the lower portions of previous growing season's branches of both host species. They lack or have short pedicels, and are dark green, subspheroidal, and bear many bract-like leaves, especially apically (Fig. 6B).

Several features were measured on mature galls containing puparia from both host species. Galls from V. laciniata measured 2.9-12.5 [7.9 ± 0.25] mm in width and 3.9-15.2 [9.5 ± 0.3] in length (n = 80).