Latrodectus mactans [Latr-m]
The venom of this very small, red-spotted spider is said to be the most deadly known. Years ago Dr. S.A. Jones reasoned out from reports of persons bitten by this spider that a potency of its venom would be almost a specific for the most excruciatingly painful cases of angina pectoris. Experience has tended to prove that Dr. Jones was right. It is generally given in the 30th potency, though the 6. may be used.