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Genus Cesonia

Striped Spider - Cesonia bilineata Tiny spider - Cesonia bilineata Cesonia rothi - female Ground Spider Cesonia bilineata - Cesonia bilineata Cesonia bilineata  - Cesonia bilineata Spider - Cesonia bilineata Ground spider - Cesonia sincera - male Cesonia rothi. ? - Cesonia
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Gnaphosidae (Ground Spiders)
Genus Cesonia
10 species in the USA, 1 of those is also found in Canada.
Cesonia bilineata Group - 4 longitudinal black lines on the abdomen in the bilineata group.

Elegans group - At most 3 longitudinal black lines.

Lugubris group - 2 paramedian longitudinal white lines reaching beyond middle of abdomen length.

Josephus group - Abdomen without pair of white stripes or with short stripes only.
bilineata - Bilineata is the most widespread species and is the only one in the genus that is found in the eastern half of the US.
bixleri - one data point somewhere near Mariposa County (east central)
classica - Southern CA, NV & AZ.
gertschi - Mostly in AZ or just outside its borders.
irvingi - Doubtful you'd ever see it, data points are on islands south of FL. Might be found on the southern tip of FL.
josephus - josephus is found only in southern CA
rothi - Very southeastern tip of CA.
sincera - C. sincera is found more in the TX region
trivittata - Very southwestern tip of CA.
ubicki - Very southeastern tip of Arizona.
See Also
Internet References
~ - PDF, A revision of the spider genus Cesonia.