Hogna frondicola

Physical description and identification

Hogna frondicola is a compact, dark wolf spider — small for its genus, which contains some of the largest lycosids in the world. The look is sober rather than showy: a dark brown body, a clean pale stripe down the middle of the carapace, a darker abdomen and strongly bristled legs. On bare soil it reads simply as a fast brown spider; on leaf litter it disappears.

Adults

• Size: females measure roughly 11–14 mm in body length and males about 9–12 mm. That makes this a medium-sized wolf spider, well under half the bulk of the Carolina wolf spider and clearly smaller than most other North American Hogna.
• Colour and pattern: dark greyish brown overall, with a pale grey to buff longitudinal band running down the centre of the carapace and narrow pale margins along its sides. The abdomen is darker still, often nearly black, with a faint lance-shaped heart mark at the front and paler flecking towards the spinnerets. Contrast is sharpest just after a moult and fades with wear.
• Eyes: the standard lycosid arrangement of eight eyes in three rows — four small eyes in a low front row, two large forward-facing eyes above them, and two more set high and far back. The two big eyes give genuinely good vision for a spider and produce the greenish eyeshine that gives wolf spiders away at night. Our guide to spider eyes covers how the arrangement works.
• Other features: the legs carry conspicuous bristles and spines. The fine hairs are sensory, picking up air movement and substrate vibration, while the stiff spines form a cage that holds struggling prey. Mature males have dark, swollen pedipalps, longer legs and a slimmer abdomen, and do most of the wandering.

Eggs and egg sac

The female encloses her eggs in a rounded sac of tough silk and attaches it to her spinnerets, then carries it everywhere until the young emerge, tilting her abdomen upward so it clears the ground. She basks with the sac turned towards the sun, which shortens development in a short northern summer. A female that loses her sac will hunt for it and reattach it.

Spiderlings

When the young are ready the mother opens the sac and the spiderlings climb onto her abdomen, where they cling to specialised knobbed hairs in a layer several deep. Contrary to a common claim, they do not stay until maturity: they ride for about one to two weeks on the last of their yolk reserves, then disperse and hunt independently, passing through several moults before they are adult.

Hunting instead of a web

No capture web is built at any stage. Hogna frondicola is a cursorial hunter that walks, watches and sprints, pinning prey with the front legs and biting immediately. Silk still matters: it produces a dragline as it moves, wraps the egg sac, and lines a short retreat under a stone, a log, a mat of dead grass or in a shallow depression in the soil. That retreat is where it shelters by day and where northern individuals wait out bad weather — see where spiders go in winter.

Where Hogna frondicola lives

This is one of the most widely distributed wolf spiders in North America. It occurs right across Canada, from Newfoundland and the Maritimes west through Ontario and the Prairie provinces to British Columbia and the Yukon, and south through much of the United States, reaching Alabama in the southeast and California in the west. Few lycosids tolerate such a span of climate.

Habitat is open and ground-level: meadows, old fields, pasture, prairie, roadside verges, forest clearings, woodland edges and the leaf litter just inside the tree line. It also turns up in gardens, on lawns and in mulch beds. The spider needs surface cover it can get under — stones, logs, boards, bark, dead grass — and open ground it can run across, and it is most abundant where the two meet.

In the north it is active from spring thaw to autumn and overwinters as an immature, sheltering under litter, stones and snow cover in a state of cold-induced dormancy. Adults appear from late spring, and males are seen most often in early summer when they leave cover to search for mates.

Is Hogna frondicola venomous?

Yes, in the ordinary spider sense: it has venom glands and uses venom to subdue insects. The venom is not medically significant to people, pets or livestock. Lycosid venom has no tissue-destroying enzyme like that of the recluse spiders and no potent nerve toxin like that of the widow spiders, and reviews of verified spider bites in North America place wolf spider bites among the minor ones, producing local effects only. There is no antivenom because none is needed.

Can Hogna frondicola bite?

It can, but it is a poor candidate for biting anyone. The spider is small, fast and committed to escape; its instinct on meeting a person is to run into cover. Recorded bites involve a spider trapped against skin — caught inside a glove, a sock or bedding, or gripped when picked up. A female carrying an egg sac may hold her ground and raise her front legs in warning rather than flee, and is best left undisturbed.

A bite feels like a sharp pinprick and leaves two tiny punctures, often with a little redness and swelling that fades within hours to a day. Wash the site with soap and water, apply a cold pack, and take an ordinary over-the-counter painkiller if it is sore. Seek medical advice if swelling spreads well beyond the bite, if the area looks infected in the following days, or if you develop hives, dizziness or breathing difficulty, which would indicate an allergic reaction rather than venom toxicity. Never cut, suck or burn a bite, and skip the folk remedies.

Ecological importance and behaviour of Hogna frondicola

Across grassland and field-edge habitats, ground-hunting wolf spiders are among the most numerous invertebrate predators present, and Hogna frondicola is one of the species doing that work over the widest area. It feeds on ants, crickets, grasshopper nymphs, beetles, flies, caterpillars, springtails and smaller spiders, taking whatever it can overpower. In farmland and hay meadows, spiders of this size and abundance are recognised as useful natural controls on pest insects.

Natural predators: ground-feeding birds, shrews, small mammals, toads, snakes, centipedes and larger spiders all take them, and spider wasps hunt them specifically — the wasp paralyses a wolf spider, drags it to a burrow and lays one egg on it. Parasitoid flies and mites attack them as well.

Prey-predator dynamics: being out in the open is the price of hunting on foot. The spider offsets it with camouflage that matches dead grass and litter, a very fast escape run and the habit of freezing flat against the ground when a shadow passes.

Courtship and season: males mature in late spring and travel to find females, signalling from a distance with rhythmic palp drumming and leg waving — an approach without the correct signal risks being treated as prey. Females may produce more than one egg sac in a good season. Most individuals complete the cycle in a year, though at high latitudes development can take longer.

Relationship with humans: entirely benign. One found indoors can be cupped and released outside, where it belongs. Reducing leaf litter and stacked wood against the walls of a house, and fitting door sweeps, keeps wandering males out far better than any spray.

Similar spiders and how to tell them apart

Quick facts

Did you know?

• The species was described in 1885 by James Henry Emerton, a self-taught American arachnologist and illustrator whose surveys of New England spiders are still consulted. He placed it in Lycosa; it was later moved to Hogna.
• Frondicola means leaf-dweller in Latin, from frons (foliage) and -cola (inhabitant) — an accurate name for a spider of leaf litter and field debris.
• Its range, from the Yukon to Alabama, is one of the widest of any North American wolf spider, and far wider than that of any other Hogna on the continent.
• Identifying North American Hogna from photographs is usually impossible. Specialists rely on the shape of the adult male palp and the female epigyne under magnification, not on colour or size.

In summary, Hogna frondicola is a small, dark, pale-striped wolf spider that hunts on foot over a huge swathe of North America, carries its eggs and then its young on its own body, and poses no threat to anyone. It is a good species to learn, because recognising it teaches the whole wolf spider family.