Other Common Names
Loving Scarab, double-horned rhino beetle
Synonyms and other taxonomic changes
(Palisot de Beauvois
Orig. Comb: Scarabaeus truncatus Palisot de Beauvois, 1806
Explanation of Names
truncatus - probably refers to the rather short horns. (Plausible speculation.)
Black, distinctly flattened, both sexes with three prominent horns on head. Elytra deeply striated. Resembles Xyloryctes jamaciensies, but has three, not one, horn. P. valgus is similar, but smaller, and has very short horns.
Both genders have horns. This is unusual among horned scarabs.
Woodlands. Adults have been reported causing cabin fires by coming down chimneys, presumably attracted to fireplace smoke and spreading embers.
April-September (South Carolina), reported July-September (North Carolina)
Adults of this genus will take fruit and meat in captivity. One sources says adults eat other insects.
Adults come to lights. Larvae feed in rotten logs, reported, in particular, from dead oaks. Presumably, males (?) use horns to defend breeding sites. Lifespan of adults is reported to be quite long (up to two years) in captivity. Reported to have structures for sound production (stridulation) (2)
. Stridulate softly when handled (P. Coin, Durham, NC 11 July 2007).
Larvae and adults are also "carnivorous" and will - if not preferentially - feed on grubs & pupae of other scarabs (incl. D. tityus)
not illustrated in most North American guides on beetles.
-smaller, with horns reduced to bumps
, Xyloryctes jamaicensis
Brimley, p. 207--occurrence in North Carolina (3)
Deyrup, p. 96, has photo of this species but does not name it--states they live in rotten logs (4)
Harpootlian, p. 115, fig. 229 (5)
Taber, p. 147, discusses life history briefly, photo, fig. 127. (2)
(Original citation is Glaser, Coleopterist's Bulletin, 1976; 30: 133-8.)
page says adults of both sexes identical.
Elytra and Antenna
--says adults eat other insects.
Beetles of Oklahoma
--museum holdings for that state