On Aquatic Carnivorous Coleoptera or Dytiscide. 757 
1210. Colymbetes alpinus, Motsch., Schrenck Reise, p. 102, pl. 7, f. 2. Mongolia. 
“‘ Blongato-ovalis, antice posticeque sequaliter attenuatus, nitidus, scarificatus, supra nigro-fuscus, 
subtus niger ; capite thoraceque antice, elytrorum basi angustissime, lateribus, palpis, antennis pedibusque 
testaceis. Long. 24 1., lat. 14 1.” 
“Trés voisindu Colymb. arcticus, Payk., dont il se distingue par une forme plus attenuée postérieurement, 
la tache postérieure du corselet plus développée et un couleur un peu plus foncée. Peut-étre seulement 
une variété alpine du premier. Je l’ai pris sur les glaciers du Hamar—Daban en Mongolie.” 
This is most probably, as indicated by the describer himself, a variety of Dytiscus arcticus. (No. 
736).—D. 8. 
1211. Colymbetes (?) angusticollis, Curt. Tr. Linn. Soc. XVIII, 1839, p. 195, p. 15, f. E, Chili. 
“‘Ochreus ; oculis, capite, clypeo excepto, scutello subtusque nigris ; thorace angusto ; elytris longissimis 
nigro-lineatis reticulatisque. Length 44, breadth 2 lines.” 
“ Ochreous, shining; head and eyes black, leaving a semiorbicular ochreous space on the clypeus ; 
thorax short, a little broader than the head, transverse-oblong, a line of punctures before and behind 
near to the margins, a short channel on the disc, sides alittle depressed. Elytra nearly twice as broad as 
the thorax at the base, and seven times as long, elliptical, apex truncated a little obliquely ; some scattered 
punctures in lines, a short black streak on each side of the scutellum, three long ones down the disc, and 
two or three oblique ones on the sides; the spaces between somewhat reticulated with black, leaving a 
broad marginal space free ; underside piceous.” 
«¢ A male from Port St. Elena. The narrow thorax and very long elytra depart so far from the typical 
form of Colymbetes, that I have little doubt of this being a good genus; but as I have no specimen to 
dissect I have not ventured to establish it as such.” 
This is a very distinct species of Lancetes, with very peculiar thorax.—D. S. 
1212. Colymbetes annulatus, Zoub., Bull. Mose. VI, 1833, p. 318. Turcomania. 
“Tong. 3} 1., larg. 12 lig. La téte et le corselet sont ferrugineux ; Les ¢lytres sont dun brun jaunatre 
a la loupe ils paraissent ponctués. Le dessous du corps et les pieds sont ferrugineux. Chaque anneau 
de abdomen et la poitrine sont bordés de noir.” 
This should perhaps be placed in the genus Agabus.—D. S. 
1213. Colymbetes assimilis, Kirb., Faun. bor. Am. IV, p. 70. North America. 
‘‘Obovatus, depressus, levis, niger; prothorace flavescenti, immaculato ; elytris flavescentibus, nigro 
ereberrime irroratis ; pedibus flavis ; brachiis brevissimis piceis. Length of body o# lines.” 
“This species represents C. notatus, which it is very like, but the elytra are wider towards the apex 
which gives the insect an obovate shape, the black dots of the elytra are more numerous and minute ; 
the prothorax is without spots, and the arms or forelegs are shorter and of a different colour.” 
This is not noticed by Crotch in his “ Revision of the North American Dytiscide” ; it is no doubt a 
species of Rhantus, but apparently not one known to me.—D. 8. 
1214. Colymbetes basalis, Gebl., Ledeb. Reis. II, p. 65. Siberia. 
‘Niger, thorace subquadrato elytrisque lividis, illo apice et lateribus, his basi margineque pallidis, 
pedibus ferrugineis. Long. 4 lin., lat. 2 1. Nitidus, supra subtilissime punctulatus caput nigrum,” 
&e., &e. 
“Semel ad lac. Noor-Saisan captus.” 
The Munich Catalogue has referred this to the genus Agabus.—D. 8. 
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