DYTISCIDJCj GYRINID^E. 
Ins. 45 
fornia, p. 615, sericuns , British Columbia, p. 619, latitans , Germany, 
Belgium, p. 621, liispanicus , Spain, p. 622, gomJoti (Dej., MS.), Madagas- 
car, p. 623, and validus, Chili, p. 624, id. 1. c. 
Colymbetes crotchi , California, p. 626, rugipennis , Nebraska, tliomsoni , 
Lapland, Iceland, Greenland (?) p. 628, substrigatus , Arabia, vagans, N. 
Persia, p. 630, and procerus, Arabia, p. 631, 1. c. 
Hyderodes crassus and collaris , id. Z. c. pp. 633 & 634, Australia. 
Dytiscus vcxatus, North-Western North America, p. 643, latro, Man- 
churia, aud piceatus, Irkutsk, p. 644, id. 1. c. ; D. zersi , Sordelli, Bend. 
1st. Lomb. (2) xv. pp. 137-139, fig. 6, and Bull. Ent. Ital. xiv. p. 232, fig. 
Fossil, from the lacustrine deposits of Morla, near Bergamo. 
Hydaticus modestus , p. 650, americanus, N. America, p. 651, rectus , 
Parana, amazonicus, Upper Amazons, p. 655, dineutoides, Sarawak, p. 657, 
conco'or , Cochin China, p. 661, ponticus, Mesopotamia, p. 662, agaboides , 
Cochin China, p. 663, rhantoides , Japan, Formosa, Manchuria, China, 
p. 664, dcemeli (Wehncke, MS.), Australia, p. 668, rectangulus , Persia, 
Punjab, and duplex , Borneo, p. 669, Sharp, l. c. 
Thermonectus depictus (Reiche, MS.), Colombia, p. 679, simulator , 
Parana, p. 681, cuneatus, Panama, and batesi, Upper Amazons, p. 682, 
id. 1. c. 
Sandracottus guttatus , Australia, rotundus } Celebes, p. 688, ornatus, 
p. 689, and nauticus, Borneo, p. 690, id. 1. c.. 
Graphodcres perplexus , N. America, and elatus } Amurland, N. America, 
id. 1. c. p. 695. 
Cybister siamensis, Siam, Andamans, p. 717 ,prolixus, Ceylon, convexus, 
East Indies, p. 718, filicornis, Gaboon, Guinea, p. 719, deplanatus, Came- 
roons, Cape Coast Castle, operosus (Dej., MS.), Madagascar, p. 720, 
insignis, G.aboon, p. 722, modestus , Cameroons, Gaboon, p. 725, cinclus \ 
Madagascar, p. 730, asiaticus, India, Persia, Mesopotamia, fumatus, Siam, 
Malay Peninsula, p. 731, crassipes, Arabia, tibialis, Madagascar, p. 735, pec- 
toralis , Deccan, p. 736, wehnckianus, India (?), cephalotes , Abyssinia, p. 737, 
dytiscoides, Madagascar, p. 738, confusus , India, Ceylon, China, p. 739, 
gracilis , India, ventralis, Madras, p. 742, crassus , Sylhet, p. 743, cognatus , 
Java (?), p. 744, celebensis, Celebes, p. 745, and ponticus , Mesopotamia, 
p. 748, id. 1. c. 
GyRINIDjE. 
R^gimbart, M. Essai monographique de lafamille des Gyrinidce. l^ 10 
partie. Ann. Soc. Ent. Fr. (6) ii. pp. 379-468, pis. x.-xii. 
This paper is preceded by notes on anatomy, transformations, &c. 
The author divides the Gyrinidce into the three tribes Enhydrini , Gyrinini , 
and Orectochilini, of which only the first is discussed at present. Details 
of a considerable number of species are figured. 
Dineutes truncatus , Sharp, and Gyreies lionotus , Aub6, figured ; Sharp, 
Biol. Centr. Am. Col. i. (2) pi. i. figs. 15 & 16. 
Macrogyrus, g. n., Regimbart, Ann. Soc. Ent. Fr. (6) ii. p. 432. Allied 
to Enhydrus ; suture of first two abdominal segments oblique, completely 
effaced on the outer half, $ with first joint of the front tarsi consider- 
