Spiders in Idaho

Idaho has 12 unique spider species of which the brown recluse and the black widow are considered the most dangerous. The hobo that was detected here for the first time during the 1960s commonly thrives throughout the country, though its level of toxicity to humans remains a topic of debate.

Common spiders: Hobo (Eratigena agrestisI), Cat-faced (Araneus gemmoides)

Largest spider: Hobo (Eratigena agrestisI)

Highly Venomous Spiders

Sicariidae

• Brown Recluse (Loxosceles reclusa)

Cobweb (Theridiidae)

• Black Widow (Latrodectus Hesperus)

Less Venomous Spiders

Orb-weaver (Araneidae)

• Banded Garden (Argiope trifasciata)
• Western Spotted Orb-weaver (Neoscona oaxacensis)
• Cat-faced (Araneus gemmoides)

Jumping (Salticidae)

• Bold Jumper (Phidippus audax)
• Platycryptus californicus

Cobweb (Theridiidae)

• Triangulate Cobweb (Steatoda triangulosa)

Prowling (Miturgidae)

• Long-legged Sac (Cheiracanthuim mildei)

Funnel Weaver (Agelenidae)

• Barn Funnel Weaver (Tegenaria domestica)
• Hobo (Eratigena agrestisI)

Ground (Gnaphosidae)

• Sergiolus montanus

Wolf (Lycosidae)

• Trochosa ruricola