CARA.BID.’E, DYTISCIDAH. 
Ins. 21 
Anophthalmus merhli^ J. Frivaldzsky, Tei’m. fiizetek, 1877, p. 24G, 
Transsylvanian Alps; A. suaneticm^ E. Reitter, Deutsche E. Z. 1877, 
p. 289, Caucasus : spp. nn. 
Bemhidiides. 
The Bembidia of St. Helena are very characteristic and manifestly 
aboriginal, being mostly apterous and tree-frequenting ; T. V. Wollaston, 
Col. St. Hel. pp. 5-7. 
Limnastas galilmis, Brill., with imperfectly developed eyes, fouudnear 
Bastia ; A. de Perrin, Bull. Soc. Eut. Fr. (5) vii. p. Ivii. 
Ajiteromimus, subg. n. of Benihldium, p. 7 ; apterous, with very small 
eyes, prothorax angulated behind ; for B. platyderoideSj sp. n., p. 9, St. 
Helena : Wollaston, 1. c. 
Pseudo2)hiloc{1i]thus, subg. n. of Bemhidium, p, 7 ; allied to above, but 
prothorax rounded behind, antennae filiform. For B. nuhigenn, p. 10. 
grayanum^ p. 11, suhlimhatum, p. 12, trechoides, p. 13, spp. nn., St. Helena ; 
id. 1. c. 
Endosomatium, subg n. of Bemhidlum, p. 8; antennae mouilifonii. For 
B. megalopH^ p. 1 4, dicksonioi and riifo-mffusum, p. 15, gemmuli})enne^ 
p. 16./ossor, p. 17, evunescenSy p. 18, spp. nn., Sb. Helena; id. 1. c. 
Bemhidiam misellum^ sp. n., E. v. Harold, Deutsche E. Z., 1877, p. 342, 
Yeddo. 
DyT[SCIDvE. 
Sharp, D. Observations on the Respiratory Action of the Carnivorous 
Water-beetles (Dytiscidce). J. L. S. xiii. pp. 161-183. 
Experiments on Pelobius hennanni^ Bydrovatus dypealis^ Shp., By- 
phydrus ovatm^ Bydroporus incequalis, pictuSy gyUenhalliy eleganSy and 
\2-pustulatm, Noteras sparsitSy Laccophilus obscurus, Colymbetes exoletuSy 
llybius fuliginosus, Agabus hipmstidatusy Acilius sulcatus, var., A.fas- 
ciatuSy and Dytiscus marginalis. The habits of the first two of these 
accord with their structural peculiarities, and they are, in the author’s 
opinion (with Amphizoa), the most primitive of the existing forms of 
Dytiscidce. Both remain under water a very long time, the ratio of the 
concealed and breathing times being 375 to 1, whereas in the highly- 
developed Dytiscus marginalis the ratio is only 12 to 1. The grade of 
development bears a direct proportion to the activity, corroborating 
Herbert Spencer’s generalization. 
Dytiscus. M. R^gimbart, Ann. Soc. Ent. Fr. (5) vii. pp. 263-274, pi. vi. 
figs. 6-12, describes the copulatory organs and genital functions in this 
genus (and Cybister). Copulation and ovipositing take place several 
tiroes, and a male has been observed in connection with several females 
in succession, at slight intervals. 
The same author, 1. c. pp. 347-354, enumerates the Dytiscidos collected 
by C. Piochard de la Brhlerie in his Eastern travels. Cybister africanusy 
Cast., is considered distinct from tripunctatuSy 01. ; Bydaticus rufuluSy 
Aub6, = leandevy Rossi, var.; Agabus fontinaliSy Steph , and nigricollisy 
