[55] _British Sessile-eyed Crustacea_, ii. 381. [56] _Book of Nature_, i. 174. [57] _Mémoires_, iv. 386. [58] _Proceedings Boston Society of Natural History_, xxi. 223–228. [59] _Natural History of Aquatic Insects_, p. 47. [60] _Mémoires du Museum_, xviii. 442, 443. [61] _Mémoires_, vi. 352–55. [62] _Diptera_, iii. 281. [63] _Cambridge Natural History_, v. 494. [64] _Mémoires pour servir_, i. 577 sqq. [65] _Bulletin of the Illinois State Laboratory of Natural History_, iv. 167. [66] W. Evans, _Trans. Entomol. Soc._ (London), iv. 261. [67] _Mémoires pour servir_, t. vi. Plate 31. [68] _Mémoires du Muséum_, t. xix. pp. 103, 104. Transcriber’s Notes: 1. Obvious printers’, punctuation and spelling errors have been corrected silently. 2. Some hyphenated and non-hyphenated versions of the same words have been retained as in the original. 3. Superscripts are represented using the caret character, e.g. D^r. or X^{xx}. 4. Italics are shown as _xxx_.