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Dynastes tityus
Range:  eastern United States, principally the southeast
Size:  30 - 65 mm

Dynastes tityus is closely related to the enormous Hercules beetle (Dynastes hercules) of Central America, which can reach lengths of 17 cm (6.5 inches).  D. tityus measures some 6 cm in length and occurs over a wide area of the eastern United States, ranging as far north as New Jersey, and as far west as Texas.  The adult beetles have a distinctive odor, possibly defensive, or perhaps pheromonal.  The thoracic horn of the male in this species often bears a small prong on either side of its base.  The female, like that of other rhinoceros beetle species, is hornless.  The larvae develop in the compost of dead trees, particularly deciduous hardwoods.

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Along with D. granti of Arizona, D. tityus ranks among the largest and heaviest of North America's insects occurring north of Mexico.  Both of these species are of similar weight and dimension, although D. granti has proportionately longer horns for its size.
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Dynastes tityus (pair) - Image  K. Hightower

 
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The male Dynastes tityus is of an olive green hue that varies to an ashy grey.  The pattern of spots on the elytra (wing covers) is unique to each individual.
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Dynastes tityus (male) - Image  C. Campbell

 
Dynastes tityus (female) - Image  C. Campbell
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A female D. tityus of a much darker, more green-brown colour.   The sexes look quite similar in respect to colouration, although they are still readily distinguishable by the fact that the male of the species, like other kinds of rhinoceros beetles, has horns. 
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