On Aquatic Carnivorous Coleoptera or Dytiscidce. 765 



on each side near the fore border, and a middle longitudinal impressed line. Each elytron with four 

 lines of impressed points and with a tawny costa. Length of the body, 1\ lines." 



It would appear from the above that this is a species near to if not identical with Colymbetes piceus, 

 Kl. (No. 957).— D. S. 



1249. Colymbetes sobrinus, Motsch. Bull. Mosc. 1859,111, p. 170. North America. 



" Depressiusculus, ovatus, subdilatatus, postice acuminatus ruguloso-reticulatus, nitidus supra niger, 

 subtus ater, ore, palpis, antennis, epipleuris pedibusque plus minusve rufescentibus ; capite triangulare 

 antice arcuato, quadrifoveolato ; thoraoe trausverso, ad basin utrinque transversim impresso anticeque 

 grosso punctate, lateribus marginatus, angulis anticis prominulis, posticis subacutis ; elytris subparallelo 

 ovatis, punotis distinctis quadruplici serie ; trochanteribus obtusis. Long. 4 1., lat. 2 J 1." 



" Par sa forme applatie et anguleuse il ressemble a notre C. neglectus, Er. et au C. chalconatus, Panz., 

 mais parait encore plus deprime et plus parallele. La tete est triangulaire, arrondie en avant, avec 

 quatre fossettes, dont deux sur le front et deux sur la marge interne des yeux et posterieurement. Le 

 corselet est transversal, avec des gros points epars le long du bord anterieur et de pareils dans lea 

 impressions transversales quise voient de chaque cotede la base et qui s'effacent entiferement au milieu de 

 cette demiere. Les elytres sont plus fortement reticulees que le corselet et marquees chacune de quatre 

 stries formees par des points aussi gros que ceux du corselet, dont la quatridme n'est visible que sur la 

 partie posterieure du cote lateral, qui fait un peu saillie ; pris de la carfene laterale il y a encore une rangee 

 de points impiimes." Ross Colony. 



This is probably a species of Agabus. — D. S. 



1250. Colymbetes (Eantus) socialis, Waterh., Ann. Nat. Hist. 4 ser. XVIII, p. lOG. Eodriguez 

 Island. 



" C. elongato-ov.alis, supra obscure flavicans, infra niger ; capite postice nigro, vertice transversim 

 flavo-notato ; thorace disco guttis parvis duabus approximatis piceis notato ; elytris obscurioribus (flavo- 

 limbatis) ; prostemo pallido. Long. 4| lin., lat. 2| lin." 



" Elongate oval, shining. Head yellow with an oblique spot on each side on the forehead, and the 

 neck black, the black portions uniting at the eyes. Thorax yellow, with the middle of the anterior 

 and posterior margins and two approximate discoidal spots pitchy; very shining, with a line of punctures 

 along the front margin ; there is also a line of obscure punctures along the sides and extending a .short 

 distance along the posterior margin ; the extreme lateral margins are distinctly incrassate. Scutellum 

 pitchy. Elytra shining, with the sutural line and the sides yellowish, the re.st closely spotted with small 

 brownish markings as in C. notatus, F. ; each elytron with three rows of rather large punctiues, each row 

 containing about eight or ten punctures. Underside very shining, black, except the prostemum which is 

 yellow, and the margins of the abdominal segments, which are obscurely pitchy. Legs pitchy yellow ; 

 intermediate femora and tibiae moderately thickly and finely punctured." 



1251. Colymbetes strigosus, Lee, Proc. Ac. Phil. 1862, p. 522. North America. 



" Elongate oval ; thorax with sinuous rugosities, not connected together ; lines of elytra deep and 

 distant ; legs very dark. -62. Fern. San Diego, California." 



This is considered by Crotch to be the same as C. strigatus, No. 964 ; it may possibly I think prove to 

 be a distinct species, but I have seen only the male in the case of one of the species, and a female in the 

 other. — D. S. 



6 F 3 



