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Comments & ID Thoughts
It was longer than an inch. Hairy like a wolf spider. I had never seen a spider with a big chocolate-drop structure on its abdomen like that. The markings on its abdomen indicate that the chocolate-drop structure is not anomalous. I wondered if it were some sort of egg sac. Higher resolution images are available.
- Submitted by:
- Submitted: Mar 6, 2019
- Photographed: Aug 11, 1999
- Spider: Tigrosa grandis
- Sex:
Male, - Location: Boulder field, Colorado, United States
- Spotted Outdoors: Open field, pasture, prairie, grassland
- Found in web?: No
- Attributes: Dorsal
Mar 8, 2019
Aug 10, 1999
Boulder , 
Hi, this is a Wolf Spider (Lycosidae), Tigrosa grandis. I don’t now what is on the abdomen, it might be from an injury, or just a drop of mud.
I’m wondering if it might be from a parasitic wasp – either wasp eggs or a leaking wound. I tried to find a similar photo but there is a mind-numbing amount of videos of wasps and spiders fighting to the death.