It is now quite well established that certain spiders found in the United States are poisonous, the chief one being Lactrodectus mactans, commonly known as the black widow or hour-glass spider. No doubt it is thought by many to be the only venomous spider in this country; however, an occasional case is found in which other species are responsible. Whether or not the reaction is due to an individual sensitiveness on the part of the patient is, as yet, a matter of some conjecture. It does remain a fact, however, that definite reactions do occur, as is shown by the following case:
Mrs. C. S., aged 24, entered the hospital because of a spider bite on the ulnar side of the right elbow, and a rash over the entire body with the exception of the face.
She stated that while riding in an automobile, Nov. 5, 1928, she