The larva of Lacosoma arizonicum Dyar is figured for the first time. This species was previously known to feed on oaks (Quercus), but no specific Quercus species has been reported. We studied the life history of L. arizonicum and confirm four larval host plants from field-collected larvae: Quercus arizonica, Q. emoryi, Q. gambelii, and Q. hypoleucoides. Larvae were successfully reared to pupation in captivity on Q. virginiana (in Florida). A tachinid fly in the genus Lespesia, was reared from a single L. arizonicum larva.
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