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[[strikethrough]] 23 [[/strikethrough]] [[strikethrough]] 16 [[/strikethrough]] (51) CHARLES V. RILEY and L. O. HOWARD. An interesting Aquatic Bug. Insect Life, IV, Nos. 5 and 6, December, 1891, pp. 198-200, fig. 22. Original figure and characteristics of a remarkable North American Aquatic Heteropteron assigned to the family Hydrobatidae and most nearly related to the genus Metrobates [Subsequently (l.c. Nos. 9 and 10, June 1892, p. 321) Dr. E. Bergroth named the insect Rheumatobates rileyi]