Scoliidae (Hymenoptera) of the Lower Río Grande Valley.By Porter, C.C.
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Charles C. Porter. 1981. Scoliidae (Hymenoptera) of the Lower Río Grande Valley. The Florida Entomologist 64(3): 441-453.
The Lower Rio Grande Valley scoliid fauna includes 5 species: the aestivally common Trielis octomaculata texensis
(Saussure), Campsomeris tolteca
(Saussure), which abounds throughout the year, and the sporadically encountered Campsomeris completa
Rohwer, C. hesterae
Rohwer, and C. ephippium
(Say). The Trielis
seems to be of old Sonoran origin, while the Campsomeris
are Neotropic species, some of which invade Sonoran habitats. Valley populations of T. octomaculata
and C. tolteca
differ in phenology, activity temperatures, flower selection, and habitat preference. Campsomeris hesterae
has not been recorded previously from the United States.
The south Texas scoliid assemblage shows strikingly low equability. Of the 5 species taken since 1973,
is represented by 251 specimens,
Trielis octomaculata texensis
and C. hesterae
by 2 each, and
by a single male.