On Aquatic Carnivorous Coleoptera or Dytiscide. 763 
much broader behind than in front, the hinder angles slightly acute. Scutellum black. Elytra oval, 
obscurely ribbed longitudinally, and having at a little beyond the middle, and near to the outer margin, 
a minute oblong fenestrated spot; the usual strize scarcely distinguishable, and very irregular. Body 
beneath black. Legs fuscous.” 
Hab., Tierra del Fuego. 
The type in the British Museum seems to be a species of Platynectes.—D. S. 
1239.. Colymbetes marmoratus, Perroud, Ann. Soc. Linn. Lyon., 1864, p. 77. New Caledonia. 
“‘ Oblongo-ovatus, niger, capite in vertice brunneo-rubro. lytris rufo-brunneo vermiculatis, in singulis 
punctis triplici serie; palpis, antennis pedibusque rufo-piceis. Long. 0,012m., larg. 0,006m.” 
“ Cette espéce qui se rapporte beaucoup du Colymb. calidus, Fab., a été prise 4 Kanala, dans le mois de 
Janvier, par M. Montrouzier. Elle parait tres rare.” 
This may possibly be a species of Hydaticus or Rhantus.—D. 8. 
1240. Colymbetes monostigma, Hope, Proc. Ent. Soc., 1842, pp. 39 and 47, Australia. 
“ Ater, nitidus, elytris uno aurantio stigmate ornatis, corpore infra nigro, pedibus rufo-piceis. Long. 
lin. 34, lat. lin. 2. Port Essington.” 
This may possibly prove to be a species of Platynectes.—D. S. 
1241. Colymbetes obscuricollis, Aubé, Spec. p. 251. Chili. 
“ Ovatus, supra flavicans, infra niger ; thorace punctato rugoso, in medio amplius nigricante ; elytris 
erebre nigro-irroratis ; prosterno nigro. Long. i0 m.m., larg. 5} m.m.” 
[This diagnosis is followed, 1. c., by a description. | 
The description seems to indicate a species very similar to D, signatus (No. 926). The type in 
Chevrolat’s collection has I believe been nearly eaten up by Anthreni.—D. 8. 
1242. Colymbetes octodecimmaculatus, Macl. Ann. Jay., p. 31. Java. 
“Niger, capite maculis tribus, thorace marginali, elytris vitta marginali maculisque novem flavis. 
See ” 
Long. corp. 3°, inch. 
< Gaput maculis tribus mediis. Thoraceque macula marginali flavis. Elytris striis tribus punctorum 
obsoletissimorum, vitta marginali nec basin nec apicem attingente, maculis flavis tribus basalibus, 
quatuor mediis fasciam fere formantibus et duabus apicalibus. Corpus subtus nigrum abdominis lateribus 
rufo-maculatis. Pedes quatuor antici flavi.” 
This probably belongs to the genus Platynectes.—D. 8. 
1243. Colymbetes phzopterus, Kirby, Faun. Bor. Am. IV, p. 70. North America. 
«¢ Ellipticus, subdepressus, ater, nitidus; elytris fuscis, margine laterali dilutioribus; ore, antennis 
pedibusque, ferrugineis : prothorace serie postico interrupto.” 
«‘ Brown-winged Colymbetes, elliptical, subdepressed, very black, glossy ; elytra brown, externally 
paler, mouth, antenne, and legs ferruginous ; prothorax with the posterior series interrupted. Length 
of the body 34—3} lines.” 
“Two specimens taken in Lat. 54°.” 
“Description. Body nearly elliptical, rather depressed, smooth, very black, glossy. Head witha pair 
of transverse obscure red spots in the vertex; mouth and antenne testaceous: posterior series of the 
prothorax thickly punctured, and discontinuous in the middle ; elytra brown, a little paler at the base 
TRANS. ROY. DUB. SOC., N.S., VOL, Il. 5 F 
