DYTISCID^. 
247 
Agahus desertoi'iun, Mor., = lineatiis, Gebl. ; S. Solsky, Hor. Ent. Ross, 
ix. p. 307. 
Gaurodytes angusticoUis, J. Sahib., is not synonymous with adjjressus, 
Aube ; G. hceffneri^ Thorns., nec Aube, = wasastjerme^ Sahib. ; J. Sahlberg, 
S. E. Z. xxxiV. pp. 63 & 64. 
Agahinus, g. n., Crotch, I. c. p. 397. Allied to Noterus by form of its 
coxal process, but with 2 joints of the 4 anterior tarsi dilated in the $ , 
and the mesothoracic side-pieces distinct. Type of a tribe, Agahinini^ 
between the Noterini and Dytiscini. A. morulus, Lee, = glabrellus, 
Mots. 
Agahetes, g. n.. Crotch, /. c. p. 401. Laciniae linear, episterna hardly 
reaching coxae. A. acuductus, Harr. 
Ilghiosoma, g. n., Crotch, I. c. p. 413. Differs from Ilyhius in the 4 an- 
terior tarsi of $ being compressed, narrowly dilated, with simple claws, 
and from Agahus in its narrow laciniae. /. regularise Lec. (of which /. 
oUongus. Mots., is apparently a var.), and ? /. bifarius, K. 
Koterus japoiiicus, sp. n., D. Sharp, I. c. p. 52, Japan. 
Hydrocanthus politus, sp. n., id. ibid. Japan. 
Suphis puncticoUis, sp. n.. Crotch, I. c. p. 397, United States. 
Laccopliilus lewisi [a/i] us, p. 52, difficilis and hobensis, p. 53, Japan, 
Sharp, I. c. ; L. apicalis. id. Ent. M. M. x. p. 53, Chontales ; L. atri- 
sternalis, Crotch, /. c. p. 400, California : spp. nn. 
Rhantus anisonychus and flavigriseus, spp. nn.. Crotch, I. c. p. 409, 
United States. 
Ilyhius suffusus, Indian Territory, viridiceneus, Kansas, id. I. c. p. 411 ; /. 
hispanicus, Sharp, An. Soc. Esp, i. p._260, Escorial ; /. apicalis, id. Tr. E. 
Soc. 1873, p. 51, Japan : spp. nn. 
Agahus conspicuus, p. 48, pictipennis, p. 49, japonicus and dissimilis, 
p. 50, Japan, Sharp, I. c. ; A. eminens, Kirsch, B. E. Z. xvii. p. 131, Peru: 
spp. nn. 
Gaurodytes disintegratus, p. 416, Kansas, Canada, ceneolus, p. 417, 
Pennsylvania, Newfoundland, ovoideus, p. 418, Kansas, L. Superior, 
lutosus. Slave Lake, walsinghami, Oregon, intersectus, California, Oregon, 
p. 419, inscriptus, Labrador, strigulosus, California, p. 422, sw^wra/^s, p. 423, 
Nevada, Crotch, /. c, spp. nn, 
Copelatus externus and substriatiis, Kirsch, I.e. p. 132, Peru ; C.signaius, 
Sharp, Ent. M. M. x. p. 53, Chontales : spp. nn. 
Dytisddes. 
On the habitat of certain Dytiscides : Delabby, Bull. Soc. L. N. Fr. 
1872-73, p. 67. 
Cy bister. Stridulating organs, confined to the $ , consist of 3-5 deep 
ridges in the hoUow behind the posterior coxae, which are rubbed by a 
ridge on the underside of the femora : Crotch, /. c. p. 398. 
Cybister bimaculatus, Aube, binotatus. Boh., and owas. Lap., = 
irnmarginatus, ¥., varr. ; A. Gerstiicker, V. d. Decken's Reisen, iii, pt. 2, 
p. 75. 
Cybister tripunctatus, 01., common in Japan, cannot be considered 
specifically identical with C. africanus (Gerstacker, I. c. p. 74, unites 
