Local feeder (Diptera: Cecidomyiidae) in stems of Ambrosia

I discovered about 12-15 of these larvae living gregariously in the stem interior of a side branch of the host. They were a pale pinkish-orange color. The same side branch stem was also inhabited by an agromyzid puparium (record 0040) and a mordellid larva (record 0045). The cecidomyiid larvae possessed a pair of superficially hooklike structures on the posterior end that appeared to match the "recurved lobes on the terminal segment" described for the genus Resseliella on p. 56 and illustrated on p. 77 of Gagné (1989). I did not rear adults.