Catalogue of Trogositidae, by Leveillé, in Ann. Soc. ent. France, 1888, p. 429.
For classification, see Sharp, Biol. Centr. Amer. Col. ii. pt. i. 1894, p. 443.
See Ganglbauer, Käf. Mitteleuropas, i. p. 530, as well as Leconte and Horn Classification, etc., p. 130.
Perris, Larves, etc., p. 75.
Ritsema, Catalogue of Helota, Notes Leyden Mus. xiii. 1891, p. 223, and xv. 1893, p. 160.