BRN 9-3 - Flipbook - Page 42
Tribe Bothriospilini
Genus Chrotoma (Casey, 1891) Monotypic genus.
2. Chrotoma dunniana (Casey, 1891). Limited number
of observations in the southern part of the
southwest. Found in southern Arizona and
southeastern Texas. It is unclear whether these
disjunct populations represent a gap in range,
different species, lack of observation. . . . Found as
far south as northern Mexico. This image, by
Andrew Wesley Legan, is curated on iNaturalist and
is shown under a Creative Commons license. Follow
link.
Tribe Callichromatini (Swainson, 1840)
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Genus Plinthocoelium (Schmidt, 1924)
3. Plinthocoelium suaveolens suaveolens (Linnaeus,
1768). Limited number of observations in the
southern part of the southwest. Found in northern
Sonora and eastern Texas. It is unclear what these
disjunct populations represent - a gap in range,
different species, lack of observation. . . . Found as
far south as Panama. This image, by Ted C. MacRae,
is curated on iNaturalist and is shown under a
Creative Commons license. It is from north central
Texas. Follow link. This subspecies is unlikely in our
area.
4. Plinthocoelium suaveolens plicatum (LeConte,
1853). This subspecies is found in west Texas and in
Arizona (image shown on the following page is from
south of Portal, Arizona). Curated on iNaturalist and
shown here under a Creative Commons license; from
Paul Dennehy. See earlier notes about disjunct
populations. Check those Mulberry trees; this
burrower seems to prefer them. This species is
highly variable in color. Compare this image with
the other subspecies, Ò3Ó.
Tribe Callidiini (Kirby, 1837)
Genus Callidium (Fabricius, 1775). There are 19 species
of Callidium in the United States and Canada.
5. Callidium antennatum hesperum (Newman, 1838) Blackhorned Pine Borer. The image shown here is an
observation on iNaturalist by Tony Palmer, shown
here under a Creative Commons license. This beetle
was captured west of Portal, Arizona, on 4 May
2024. There are two subspecies of Callidium
antennatum. This subspecies is found in the west. It
feeds on dead conifers. BugGuide, citing an entry
about the eastern subspecies in Eastern Forest
Insects by Whiteford Baker, notes that ÒEggs are laid
beneath bark scales on dead trees or overwintered
cut wood. The larvae feed on the phloem and outer
sapwood, making broad wavy tunnels and pushing
frass out through small holes. Pupation occurs in the
wood in long cells plugged with wads of frass.
Usually one generation per year.Ó And for context,
yes that is a thumbnail in the lower right of the
image. This is a small beetle.
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