Yes the brown recluse is more venomous because the toxin goes through your blood and destroys tissue if it isn't treated then you might have to get it amputated EDIT the venoms toxicity is comparable to each other, however the types are different so an answer based on the effects of the venom of a brown recluse over that of a black widow is invalid, the only way to determine an answer for this is to use a comparison in the quantities required to form a lethal dose, this is usually done by extrapolating upwards via a lethal dose in a mouse,... because you would kill a person to find out directly otherwise.
black widow,brown widow, and brown recluse
The Brown Recluse and the Black Widow are both poisonous and native to New Mexico.
arachnids
Scorpions, Black Widow Spider, and Brown Recluse Spider. These came to me first, there are a lot more critters around.
Bears, venomous snakes of several varieties, black widow and brown recluse spiders, alligators, bees and wasps.
According to Dr. G.B. Edwards, an arachnologist with the Florida State Collection of Arthropods in Gainesville, the brown widow venom is twice as potent as black widow venom. However, they do not inject as much venom as a black widow, are very timid, and do not defend their web.
No, the brown recluse
The two most famous and venomous are probably the Black Widow and Brown Recluse (or Violin Spider). Their venom is powerful and may be fatal if untreated.
The brown recluse (No, the brown recluse is brown, not black. It also has black pattern on its back resembling a violin. Thus, the brown recluse's nickname of fiddle-back.)
the brown recluse would win because of the scaring and the blue red discoloration: answer- actually I just put these two spiders in the same container and watched them fight to the death. The brown recluse didn't really do anything, but the black widow spun its web and when the brown recluse got stuck inside of i, it was game over.. the black widow attacked the brown recluse by stabbing it with it's back legs and then bit it multiple times. Now the black widow is posted up in the corner of the container full.
Black widow, brown widow, and desert recluse.
http://www.idph.state.il.us/envhealth/pcreclusespiders.htm Black widow and Brown Recluse