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Tibicen dealbatus (MALE) - Megatibicen dealbatus - male

Tibicen dealbatus (MALE) - Megatibicen dealbatus - Male
Marlin, Falls County, Texas, USA

Tibicen dealbatus
Tibicen dealbatus largely replaces T. pronotalis as one travels west into the "Plains", and Texas is no exception. Both T. dealbatus and T. pronotalis are riparian and often associated with tree thickets and permanent/quasi-permanent water sheds. Not only are they similar ecologically, they are very similar behaviorally; the calls of the males are "identical".

They are also thought to intergrade along a thin band where the ranges abut. The males of both dealbatus and pronotalis will often call an hour or two after sunset, a strange behavior for Tibicen here in the most other species call from sunrise to sunset and rarely later.

I have observed dealbatus specimens from eastern, central & southern Texas are often larger and browner than those from Kansas and Nebraska. It seems as though populations along the southern perimeter of the range are often browner and rarely characterized by the "bright" greens seen in many populations in the heart of the Plains (Colorado, Kansas, Nebraska, South Dakota, & Montana).

In reading commentaries, I encounter this quote from … David J. Ferguson, 24 December, 2007 - 1:48pm

"a few comments - This species is usually green or at least greenish in most areas where it is found (while it is alive anyway), and the color is usually enough to separate it from T. dorsata. However, in the Rio Grand drainage in New Mexico, it is brown, and looks a lot like T. dorsata. The dark markings are not as strongly developed, and as Andy mentioned the head is wider. Also, the brown is not the rich orangey brown that is typical of T. dorsata. This species occurs primarily in trees along watercourses or in towns, while T. dorsata favors shrubs out in open country (though I have found the two together where habitat meets, and even what I think might be a few hybrids once). I have been here in New Mexico since 1982, and have never found T. dorsata along the Rio Grande - so far anyway."
… David J. Ferguson, 24 December, 2007 - 1:48pm

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