Hermeuptychia sosybius, the Carolina satyr, is a butterfly of the family Nymphalidae. It is found in the United States from southern New Jersey south along the coast to southern Florida, west to south-eastern Kansas, central Oklahoma and central Texas. It is also found in Mexico and Central America.

The wingspan is 32–38 mm.Butterflies and Moths of North America collecting and sharing data about LepidopteraLife history of H. sosybius. USA: TX: Brazoria County, Bar-X Ranch, Rd. 971N, 29.13252 -95.58340, ex ovum ex ? collected on 4-Mar-2000, except o, which is TX: Wise Co., LBJ National Grassland. an ovum, 6-Mar-2000 b–d 1st instars, photographed on 14- 14- & 16-Mar-2000, respectively e–g 2nd instars photographed on 21- 19- & 21-Mar-2000 e, f are just after molt, shed larval skins are behind and 1st instar head capsule (black) is on the left in e, f is in a curled position adopted when disturbed h pre-molt quiescent 2nd instar larvae in a typical “head-to-head” resting position, 24-Mar-2000 i–j 3rd instars, 24- & 27-Mar- 2000 k–l 4th (ultimate) instars, ??, 3- & 6-Apr-2000 l close to pupation, note the color and shape change m prepupa, 6-Apr-2000 n–p pupae, 9-Apr-2000, 8-Aug-1998, & 17-Apr-2000 o is from Wise Co., wing color is starting to develop p near eclosion, dark adult is seen through semi-transparent pupal cuticle. Most images show different individuals. Images a–g are enlarged 2 times (scale on f) compared to the rest (scale on l)

The larvae also feed on various Poaceae species, including Axonopus compressus, Eremochloa ophiuroides, Stenotaphrum secundatum and Poa pratensis.

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