The following list introduces the numbers by which the specimens illustrated in this memoir are designated in the catalog of the United States National Museum. Each specimen is also marked with a field catalog number, the locality in which it was found, and the name of the collector: PLATE CXI. _a_, 155895; _b_, 155897; _c_, 155898; _d_, 155896; _e_, 155900; _f_, 155916.