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We present a review of Dendrocephalus (Dendrocephalinus) with an updated diagnosis for the subgenus and a key to all known species. We provide new records of Dendrocephalus alachua, which was previously supposed to be extinct, and we describe a new species, Dendrocephalus proeliator sp. nov., which is separated from all other species based on the form of the male frontal appendage. Dendrocephalus proeliator sp. nov. appears to be morphologically intermediate between D. alachua and D. lithaca. In addition, we provide conservation assessments for all four species in the subgenus, according to IUCN Red List standards. We also report for two species the first known examples of direct male-male agonistic behaviour and competition for access to areas frequented by receptive females.
The host plant and life history observations of Plesioclytus morrisi Wappes and Skelley and Plesioclytus relictus Giesbert (Coleoptera: Cerambycidae: Plesioclytini) are described for the first time. The host for both species is shown to be Polygonum polygamum Vent. (Polygonaceae). Observations also indicate that plants chosen for oviposition occur in open sand areas of scrub habitat.
Host plants of Romulus globosus Knull (Coleoptera: Cerambycidae) are described for the first time. Notes on its natural history are provided. The larvae of R. globosus feed in living roots of scrub oaks, including Quercus geminata Small, Quercus myrtifolia Willd., and Quercus laevis Walter. Field observations show that the beetle emerges below ground, and females may burrow to lay eggs on the roots.