On Aquatic Carnivorous Coleoptera or Dytiscidce. 7G3 



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 striae 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, nig^r, capite in vertice bntnneo-rubro. Elytris rufo-brunneo vermiculatis, in singulis 

 punctis triplici serie; palpis, antennis pedibusque rufo-piceis. Long. 0,012m., larg. 0,006m." 



" Cette espece qui se rapporte beaucoup du Colymb. calidus, Fab., a ete prise a Kanala, dans le mois da 

 Janvier, par M. Montrouzier. Elle parait tres rare." 



This may possibly be a species of Hydaticus or Rhantus. — D. S. 



1240. Colymbetes monostigma, Hope, Proc. Ent. Soc, 1842, pp. 39 and 47. Australia. 



" Ater, nitidus, elytris uno aurantio stigmate ornatis, corpore infra nigro, pedibua rufo-piceis. Long, 

 lin. 3|, lat. lin. 2. Port Essington." 



This may po.ssibly prove to be a species of Platynectes. — D. S. 



1241. Colymbetes obscuricollis, Aube, Spec. p. 251. Chili. 



" Ovatus, supra flavicans, infra niger ; thorace punctato rugose, in medio amplius nigricante ; elytris 

 crebre nigro-irroratis ; prosterno nigi-o. Long. 10 m.m., larg. 5i 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. S. 



1242. Colymbetes octodecimmaculatus, Macl. Ann. Jav., p. 31. Java. 



" Niger, capite maculis tribus, thorace marginali, elytris vitta marginal! maculisque novem flavis. 

 Long. Corp. -^^ inch." 



" Caput maculis tribus mediis. Thoraceque macula marginali flavis. Elytris striis tribus punctorum 

 obsoletissiniorum, vitta marginali nee basin nee 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. S. 



1243. Colymbetes phseopterus, Kirby, Faun. Bor. Am. IV, p. 70. North America. 



" Ellipticus, subdepressus, ater, nitidus ; elytris fuscis, margine laterali dilutioribus ; ore, antennis 

 pedibusque, ferrugineis : prothorace serie posticointerrupto." 



" Brown-winged Colymbetes, elliptical, subdepressed, very black, glossy ; elytra brown, externally 

 paler, mouth, antennae, and legs ferruginous ; prothorax with the posterior series interrupted. Length 

 of the body 31— 3^ lines." 



"Two .specimens taken in Lat. 54°." 



" Description. Body nearly elliptical, rather depressed, smooth, very black, glossy. Head withapair 

 of transverse obscure red spots in the vertex ; mouth and antennse testaceous : posterior series of the 

 jirothorax thickly punctured, and discontinuous in the middle ; elytra brown, a little paler at the base 



TRANB. HOT. DUB. SOC, N.S., VOL. II, 5 F 



