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For the United States & Canada
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Genus Scytodes

Scytodes - female UNKNOWN SPIDER - Scytodes lugubris Scytodes - Scytodes univittata - male Spitting Spider? - Scytodes lugubris Scytodes - Scytodes univittata - female Scytodes sp. - Scytodes long legged mottled cream spider - Scytodes Recluse? - Scytodes
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Haplogynes)
Family Scytodidae (Spitting Spiders)
Genus Scytodes
7 species in the USA & Canada.
Carapace Patterns compared to drawings in Valerio, 1981 (1)
Carapace Patterns and leg qualities compared to specimens on website species pages (updated:2017) (see Internet References below)

S. atlacoya: ♂ (spotted or ringed legs, with darker joints)

S. fusca: ♂ (clear legs, with darker joints)

S. longipes: ♂ (spotted, splotched or ringed legs, with darker joints)

S. lugubris: ♂ (long-thin stripes on legs, with dark joints)

S. Thoracica: ♂ (thickly-banded legs)

S. univittata: ♂ (clear legs, males have modified fore-legs, with two rows of spines)
S. atlacoya - TX (from the Texas Spider List, linked below)
S. dorothea - USA, (CO, TX that I'm sure of)
S. fusca - FL (2)
S. longipes - Pantropical
S. lugubris - Pantropical
S. thoracica - Eastern States and adjacent Canada to Indiana (2)
S. univittata - TX to CA (2)
S. zapatana - USA
Internet References
~ Texas Spider List - List of species found in Texas.
~ - Spiders From the Southwestern United States with Descriptions of New Species, Gertsch, 1935.
~ Possible Scytodes lugubris by Pen Araneae on Flickr
~ Comparative Biology of cave-dwelling Spitting Spiders - 2011 Article with images and information about this genus.
~ BOLDSYSTEMS page for the genus Scytodes - These are specimens verified by DNA testing.
Works Cited
1.Spitting Spiders (Araneae, Scytodidae, Scytodes) from Central America.
Valerio, C.E. (1981). 1981. Bull. AMNH 170: 80-89.
2.How to Know the Spiders
B. J. Kaston. 1978. WCB/McGraw-Hill.