288 . Ins. 
RHYNCHOTA. 
Hydrometridje. 
White, F. B. Report on the Pelagic Hemiptera procured during the 
Yoyage of H.M.S. ‘Challenger,’ in the years 1873-76. Rep. Yoy. 
‘Challenger,’ Zool. vii. pt. 19, pp. 82, pis. iii. ( Cf . Ent M. M. xx. 
pp. 119 & 123.) 
The sections into which this exhaustive treatise is divided are History 
and Bibliography, including copies of nearly all important previous 
notices on Halobates , anatomy and description of genera and species 
(all the known species, as far as possible, being fully described and 
figured), life-history (including metamorphoses) and habits, geographical 
distribution, appendix, and index. 2 new genera of the family (1 
only marine) and several new species of Halobates are described. The 
two pelagic genera are distinguished as follows: — 1. Body thickly clothed 
with short pubesence ; front tibia with a triangular dilatation near the 
apex ; middle tibia and first joint of tarsus with a long fringe ; hind 
tarsus with one joint : Halobates. 2. Body more sparsely clothed with 
short pubescence ; front tibia cleft, but not with a triangular dilatation 
at the apex ; middle tibia and tarsus without a long fringe ; hind tarsus 
with two joints : Halobatodes. 
Halobates platensis , Berg. $ described by him ; An. Soc. Arg. xvi. 
p. 120. 
New genera and species : — 
Platygerris , F. B. White, Ent. M. M. xx. p. 36. Distantly related to 
Hydrobates and Halobates. Type, P. depressa, sp. n., ibid., Mexico. 
Halobatodes , id. Rep. Pel. Ilemipt. pp. 23 & 58. Type, Halobates litu- 
ratus , Stal ; add H. histrio , Japan, and compar , India, spp. nn., 1. c. pp. 66 
& 68, pi. ii. figs. 5 & 6, and ? H. stceli , Dohrn. 
Stephania , id. 1. c. p. 79. Allied to Halobates ; mesonotum with a narrow 
free process (scutellar) posteriorly overlapping the base of the abdomen. 
Type, H. pictus, Germ, (a freshwater N. American species); H. platensis, 
Berg, probably also belongs to this genus. 
Velia platensis , Berg, An. Soc. Arg. xvi. p. 119, Argentine Republic, 
Uruguay. 
Halobates princeps , fig. 3, Celebes Sea, p. 44, sobrinus, fig. 5, Tahiti» 
p. 46, germanus, fig. 6, N. Pacific Ocean, Celebes Sea, China Sea, p. 50, 
hay anus, fig. 8, pi. i., Red Sea, near Aden, p. 52, proavus , fig. 1, Gilolo, 
p. 54, and frauenfeldanus (= flaviventris, Frauenf., nec Esch.), fig. 3, pi. ii., 
Indian Ocean, near Nicobars, White, Rep. Pel. Hemipt. 
BeLOSTOMATIDjE. 
Belostoma overcoming a fish three or four times its own length ; Todd, 
Am. Nat. xvli. pp. 548 & 549. 
Phthanocoris occidentalis, g. & sp. nn., indicated as a Carboniferous 
