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Hypsiglena jani
Hypsiglena torquata jani.jpg
Scientific classification
Hypsiglena torquata jani distribution.svg
The distribution of Hypsiglena jani (brown), which now includes the two former subspecies Hypsiglena torquata dunklei (orange), and Hypsiglena torquata texana (yellow).
  • Liophis janii
    Dugès, 1865
  • Hypsiglena texana
    Stejneger, 1893
  • Hypsiglena ochrorhynchus texana
    — Steneger & Barbour, 1917
  • Hypsiglena torquata dunklei
    Taylor, 1938
  • Hypsiglena torquata texana
    — A.H. Wright & A.A. Wright, 1957
  • Hypsiglena ochrorhynchus janii
    — W.W. Tanner, 1944
  • Hypsiglena torquata jani
    — Crother, 2000
  • Hypsiglena jani
    — Mulcahy, 2007

Hypsiglena jani, commonly known as the Texas night snake or the Chihuahuan night snake, is a small species of mildly venomous snake in the family Colubridae. The species is native to the southwestern United States and adjacent northeastern Mexico.


The epithet, jani, is in honor of Italian taxonomist Giorgio Jan.


H. jani grows from 10 to 16 inches (25 to 41 centimetres) in total length (including tail), record 20 inches (51 cm). It is typically a light gray or tan in color, with dark brown or dark gray blotching down the back, and has an unmarked underside. It has smooth dorsal scales. The eye has a vertically elliptical pupil. H. jani is rear-fanged, and is considered to be venomous, though it is not dangerous to humans.


As the common names imply, H. jani is a primarily nocturnal snake.


The diet of H. jani consists of primarily lizards, but it will also eat smaller snakes and occasionally soft bodied insects.


H. jani prefers semi-arid habitats with rocky soils.


H. jani is an oviparous species that breeds in the spring rainy season, laying 4-6 eggs that take approximately 8 weeks to incubate before hatching. The eggs average 27 mm (1.1 in) long by 10 mm (38 in) wide. The hatchlings are about 15 cm (5.9 in) in total length.

Geographic range

H. jani ranges from southern Kansas to southern Colorado, and south throughout New Mexico, the western half of Texas to central Mexico.


Three subspecies are recognized as being valid, including the nominotypical subspecies.

  • Hypsiglena jani dunklei Taylor, 1938
  • Hypsiglena jani jani (Dugès, 1865)
  • Hypsiglena jani texana Stejneger, 1893

Nota bene: A trinomial authority in parentheses indicates that the subspecies was originally described in a genus other than Hypsiglena.

  • Dugès A (1865). "Du Liophis janii". Mém. Acad. Sci. Lett. Montpellier 6: 32-33. (Liophis jani, new species). (in French).
  • Powell R, Conant R, Collins JT (2016). Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition. Boston and New York: Houghton Mifflin Harcourt. xiv + 494 pp., 47 plates, 207 figures. ISBN: 978-0-544-12997-9. (Hypsiglena jani, pp. 409-410 + Plate 39).
  • Stejneger L (1893). "Annotated List of the Reptiles and Batrachians Collected by the Death Valley Expedition in 1891, with Descriptions of New Species". North American Fauna 7: 159-228. (Hypsiglena texana, new species, p. 205).
  • Tanner WW (1944). "A Taxonomic Study of the Genus Hypsiglena ". Great Basin Naturalist 5 (3 & 4): 25-92. (Hypsiglena dunklei, p. 48; H. ochrorhynchus janii, pp. 48–51; and H. o. texana, pp. 51–54).
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