During the past four years the writer has been getting together a collection of Locustidæ from various parts of the State of Indiana, with a view a preparing a general descriptive paper of the species of that family found in the State. In working over the material thus gathered thirty-seven species are found to be represented, four of which are evidently new to science. Of the four, three belong to the genus Orchelimum and one to the genus Conocephalus. The former genus is represented in the collection by ten specis and the latter by four. Below is given a descritption of each of the four species believed to be new, together with such notes concerning the distribution of each as I find in my field note-book.